Ahmed Nabil Roshdy, Maged Hakim And Lamiaa Khairallah,

ABSTRACT
The Purpose Of This Study Is To Evaluate The Bond Strength Of Zirconia Core To Ceramic Veneer At Different Marginal Dimensions.

Materials and Methods: A Stainless Steel Die Resembling A Prepared Mandibular Premolar Was Machined To Allow Standardization Of The Prepared Crowns. Total Number Of Forty Ceramic Crowns Were Fabricated Using This Die. The Samples Were Then Divided Into Four Groups According To The Axial Distances From The Core To The Finish Line That Was Completed With The Veneering Material. Group 1: Zirconium Oxide Core Fabricated Till The Finish Line, Group 2: Zirconium Core 0.5 Mm Short Of The Finish Line, Group 3: Zirconium Oxide Core 1mm Short Of The Finish Line, Group 4: Zirconium Oxide Core 1.5mm Short Of The Finish Line. The Core Was Veneered And The Short Core Margins Were Completed Using Zipress Veneering Material. Then Each Group Was Thermocycled 1500 Cycles Between 5-55�C. The Samples Were Then Tested For Flexure Strength.

Results: There Was A Statistically Significant Decrease In Fracture Resistance After Thermocycling Within Each Of The Four Different Groups. Conclusion : The Bond Strength Of Zirconia Core And The Veneering Material Might Be Affected By The Difference In The Thermal Conductivity Between Both Materials.

Yassmin El Sayed Ahmed, Hend Abou El Nasr, Heba El Far And Mohamed Abdel Azim,

ABSTRACT
Objective: The Purpose Of This Study Was To Evaluate The Effect Of Occlusal Reduction For Mandibular Posterior Teeth On The Incidences Of Post-instrumentation And Post-obturation Pain In Patients With Symptomatic Irreversible Pulpitis And Symptomatic Apical Periodontitis. Participants And Methods: 44 Patients Were Included In The Study. All Patients Had Posterior Mandibular Teeth With Symptomatic Irreversible Pulpitis And Symptomatic Apical Periodontitis With No Evidence Of Peri-apical Radiolucencies In The Radiograph. The Patients Were Divided Randomly Into Two Equal Groups, Each Group Included 22 Participants. For The Intervention Group, All The Occlusal Contacts Of The Tooth Were Relieved From Occlusion, While For The Control Group, No Modification Was Done For The Occlusal Surface Of The Tooth. The Root Canal Treatment Was Done In Two Visits Where Root Canals Were Prepared Using Revo S Rotary NiTi Files While Obturation Was Done Using Modified Single Cone In The Second Visit. The Pain Was Assessed Preoperatively, 6, 12, 24 And 48 Hours After The Instrumentation, Then 6 And 12 Hours After The Obturation Using Modified Visual Analogue Scale (VAS). Patients Were Given A Placebo To Be Taken In Case Of Moderate Or Severe Pain And Ibuprofen 400mg Was Prescribed In Case Of Persistent Pain. Data Were Analyzed Using Chi-square And Fisher Exact Tests. Mann-Whitney U Test Was Used To Compare Between The Pain Value In The Two Groups.

Results: The Results Of The Study Showed That, There Is Significant Decrease In The Mean VAS Scores At All Follow Up Periods Compared To Pre-operative Pain Level In The Two Groups, But Postoperative Pain Intensity Was Higher With Occlusal Reduction Group Than With No Occlusal Reduction (post-instrumentation) With No Statistical Significance.

Conclusions: Within The Limitations Of This Study, We Concluded That Occlusal Reduction Isn?t An Effective Procedure To Reduce Post-operative Pain In Teeth With Symptomatic Irreversible Pulpitis And Symptomatic Apical Periodontitis. So We Still Have The Controversy Of Whether The Occlusal Reduction Decreases The Post-operative Pain Or Not, As We Still Have No Enough Evidence.

Mahmoud A. Dayekh , Moustafa Abdou Elsyad And Ahmed Khalifa Khalifa,

ABSTRACT


Aim: This Study Aimed To Examine The Retention Of Different Types Of Locator And Bar Attachments For 4-implant Supported Maxillary Over Denture.

Materials and Methods: An Acrylic Resin Model Of An Edentulous Maxilla Without Alveolar Undercuts Was Fabricated And 4 Laboratory Implants Were Inserted In The Canine And Second Premolar Areas. Mucosal Simulation Was Fabricated Over The Model. Maxillary Experimental Overdenture Were Constructed Over The Model And Connected To The Model With Either Bar Attachment (group I) Or Locator Attachment (group II). The Universal Testing Machine Was Used To Apply Vertically Oriented 4 Points Tensile Loads On A Metal Plate Attached To The Model With 4 Metal Chains Until The Attachments Separated From The Abutments. Maximum Load Needed To Dislodge The Experimental Overdenture From The Maxillary Test Model (retentive Force) Were Calculated. Initial Retentive Forces And Retentive Forces After Repeated Insertions And Removals Were Calculated

Results: Initial Retentive Forces And Retentive Forces After Repeated Insertions And Removals For Vertical Dislodging Force, Locator Transparent Recorded The Highest Retentive Forces, Followed By Locator Pink, Locator Blue And Bar Attachment Recoded The Lowest Retentive Forces.

Conclusions: Locator Transparent Recorded Significant Higher Retention Forces Compared To Other Types Of Locators And Bar Attachment. The Lowest Retention Was Recorded With Locator Blue And Bar Attachment.

Dina Gameel Anis, MahaEshakAmer And Mohamed Salah Abd Elmotamed,

ABSTRACT

Objectives: The Purpose Of The Study Was To Assess The Relation Between Clinical And Magnetic Resonance Imaging Findings In Temporomandibular Joint Disorders.

Materials and Methods: MRI Scanning And Clinical Examination Were Performed To Twenty Patients Of Both Sexes And Varying Ages, Complaining Of TMJ Disorders. The Disc Position, Disc Morphology, Condylar Osseous Changes, Retrodiscal Tissue Status And Joint Effusion Were Assessed. The Correlation Between The Clinical And MRI Findings Was Statistically Analyzed.

Results: Pain In The Temporomandibular Region Was The Most Common Clinical Presentation, It Accounts For 67.5% Of Cases. Significant Correlation Was Found Between Pain And Disk Morphology, Condylar Osseous Changes, Retrodiscal Tissue Status (p=0.001, 0.019, 0.003 Respectively)and With Disc Displacement. Statistically Significant Relationship Was Also Found Between Disk Position, Eminence Changes And TMJ Sounds (P=0.025, 0.004 Respectively), As Well As Between Disk Position And Maximum Mouth Opening (MMO)( P=0.018). There Was A Direct Correlation Between Retrodiscal Tissue Status And Mandibular Deviation (p=0.021). Conclusion: Clinical Evaluation Of The TMJ Can Be Nonspecific Due To Overlap Of Symptoms Between Internal Derangement And Myofacial Pain Dysfunction. MRI Should Be Part Of The Standard Evaluation When An Internal Structural Joint Abnormality Is Suspected .Disc Displacement As Observed With MRI Correlated Well With Clinical Signs And Symptoms.

Abdullah Salem Ibrahim, Maged Negm And Alaa El-Baz,

ABSTRACT
Seventy Six Human Single Canaled Teeth Were Decapitated, Instrumented Using K3 Ni-Ti Rotary System, And Then Divided Into 4 Main Groups Of 19 Teeth Each, According To The Type Of Irrigation Protocol Used; Group I, 1:1 Mixture Of 5.25% NaOCl + 18% Etidronic Acid (HEBP). Group II, 1:1 Mixture Of 5.25% NaOCl + 18% Etidronic Acid (HEBP), Followed By 17% EDTA As A Final Rinse. Group III, 17% EDTA. Group IV, 5.25% NaOCl (control Group). The Quantity Of Irrigation Was 5 Ml For 2 Minutes. Then, A Final Rinse Of 5 Ml For 2 Minutes Of Distilled Water. Sixteen Roots Of Each Group Were Subdivided Into 2 Subgroups (each Of 8 Roots), According To The Type Of Sealer Used: A Single Gutta-percha Cone Size 40 Taper 0.06 With AH Plus Root Canal Sealer. A Single Activ GP Cone Size 40 Taper 0.06 With Activ GP Root Canal Sealer. The Obturated Roots Were Horizontally Divided Into Three Equal Sections. The Middle Third Specimens Were Subject To Push-out Test By Means Of An Instron Testing Machine. Then, The Specimens Were Examined Under Digital Microscope To Determine The Type Of Bond Failure. The Remaining Three Roots Of Each Group Were Longitudinally Split Into 2 Equal Halves. The Walls Of Their Middle Thirds Were Examined For The Presence Of Debris And Smear Layer Under Environmental Scanning Electron Microscope (ESEM). The ESEM Showed Superior Results Of EDTA And NaOCl/HEBP/EDTA Groups Respectively In Smear Layer Removal Over NaOCl/HEBP And NaOCl Groups. It Was Found That EDTA Group Recorded The Highest Mean Value Of Push-out Test With AH Plus Sealer, While NaOCl/HEBP/EDTA Group Recorded The Highest Mean Value Of Push-out Test With Activ GP Obturation System.

Mahmoud Mohammed Abd El Gawad, Ibrahim Hasan El Kalla And Hanaa Mahmoud Shalan,

ABSTRACT

Objectives: The Aim Of This Study Was: 1-To Evaluate Adaptation And Interfacial Micromorphology Of Composite Restorations In Conservative Cavities. 2-To Evaluate Microleakage Of Composite Bonded With Different Adhesives.

Materials & Methods: Conservative Cavities (4?1.5?2mm) Were Prepared In The Occlusal Surfaces Of Ninety Sound Extracted Permanent Molars. Then, The Teeth Were Randomly Divided Into Three Equal Groups, Thirty Molars For Each Group (N=30) According To The Type Of Adhesive. Group 1: Ambar Bond, Group 2: Excite Bond And Group 3: Prompt L-pop. Then All Cavities Were Restored With Composite Resin (Filtek Z250). After That, Fifteen Teeth From Each Group Were Sectioned Buccolingually Into Two Halves To Evaluate Composite Adaptation Under Stereomicroscope (60X) For Both Halves At All Cavity Walls. Selected Specimens Were Examined Under Scanning Electron Microscope (750X) To Detect Interfacial Micromorphology. The Other Fifteen Teeth Were Thermocycled For 1,000 Cycles In Separate Distilled Water Baths Of 5�C And 55�C Then The Teeth Were Immersed In 1% Methylene Blue Dye Solution For 24 Hours At Room Temperature. The Teeth Were Sectioned Buccolingually To Evaluate Microleakage Under Stereomicroscope.

Results: All Specimens Had Voids Ranging From (0.1-1.7mm). Ambar Bond Showed The Greatest Number Of Samples That Had Voids (60%) Followed By Prompt L-pop (40%) And Excite Bond (33.3%). Microleakage Scores Were Highest With Prompt L-pop Followed By Ambar And Excite Bond. Resin Tag Lengths Were Longer With Excite And Ambar Bond As Compared To Prompt L-pop Bond. Conclusion: Restoration Of Conservative Cavities Without Voids Is Difficult To Achieve. Etch And Rinse System Is Still Considered A Gold Standard Adhesive.

Hanan M. Abdelaziz, Dina Elkassas And Heba Salah El-dein Hamza,

ABSTRACT
This Research Was Designed To Evaluate The Remineralizing Potential Of Fluoride In Comparison To Three Different Calcium Phosphate Based Remineralizing Agents Using Surface Microhardnesss Test.

Materials & Methods: A Total Of 50 Sound Human Mandibular Molars Were Used In This Study. Artificial Enamel Carious Lesions Were Induced And The Enamel Specimens Were Divided Randomly Into Five Groups, According To The Remineralizing Agent Used; Group A1: Molars Stored In Artificial Saliva, Group A2: Fluoride Varnish Was Used, Group A3: CPP-ACP Varnish, Group A4: F-TCP Varnish And Finally Group A5: Novamin Paste Was Applied. Specimens Were Then Subjected To A PH Cycling Protocol For Eight Consecutive Days. The Surface Micro Hardness (SMH) Was Assessed Using Vickers Microhardness Tester, Prior To Demineralization Of The Specimens As A Baseline (SMH/Baseline), Following Demineralization (SMH/Demineralization) And Finally, After The Remineralization Regimens & PH Cycling (SMH/Remineralization), Then Mean Surface Microhardness Recovery Percentage Was Calculated (SMHR %).

Results: Showed That The Highest SMHR% Was Found In Novamin (58.29 � 8.14) Followed By TCP (50.56 � 6.37), CPP-ACP (46.40 � 13.93) And Fluoride (34.94 � 9.35). While The Lowest SMHR% Was Found In Saliva Group (14.26 � 5.77). Conclusion: Crystalline Calcium Phosphate Based Delivery Vehicles Showed Higher Remineralizing Efficacy Compared To The Amorphous Calcium Phosphate Based And Fluoride Based Agents. Novamin Remineralizing System Confers The Highest Remineralization Tendency With The Highest Potential.

Raghda Esam El-Malt; Fatma Abdou El-Sayed And Hoda Abdel-Aziz,

ABSTRACT
Aim Of This Study: To Assess The Pubertal Growth Spurt In A Group Of Al-Giza School Male Adolescents, Using The Developmental Stages Of The Middle Phalanx Of The Middle Finger (MP3), And To Evaluate The Skeletal Maturity Age Differences Between Al-Giza Male Adolescents And Other Populations.

Materials & Methods: A Sample Of 1500 Male Students For Al-Giza Was Included In This Study With Age Range From 11 To 16 Years Was Collected. A Radiograph For The Middle Phalanx Of The Middle Finger By Digital Dental Radiograph For The Assessment Of MP3 Maturation Stages Was Taken For Each Subject.

Results: The MP3-G Stage (signifying The Peak Of Pubertal Growth Spurt) Was Found With High Prevalence In Subjects Aged >13-14 Years With Mean Of Age 13.36y. Conclusion: 1. The Mean Skeletal Maturity Age (MP3-G Stage) That Represents The Peak Of Height Velocity (PHV) In Egyptian Adolescent Males Of Al-Giza Was Found To Be 13.36 Y � 1.07 Years. 2. The Newly Digital Radiography Of The MP3 Region Is Definitely An Available, Simple Technique Of High Clarity, Low Radiation.

Karim Fouda, Hamdy Abouelfotouh And Ahmed Fahmi,

ABSTRACT
This Study Was Conducted To Evaluate The Difference Between Conventional Acrylic And Soft Lined Implant Partial Overdenture In Mandibular Kennedy Class I. The Aim Of This Work Was To Evaluate The Effect Of Using Soft Liner On Denture Base In Lower Kennedy Class I Partially Edentulous Patients Restored With Implant Supported Partial Overdenture Fourteen Partially Edentulus Patients Were Selected Patients And Divided Into Two Equal Groups. For Both The First And Second Groups: Endosseous Implant Was Placed In The Edentulous Region And Loading Was Done After Three To Four Month. In The First Group Conventional Acrylic Was Used While In The Second Group The Overdenture Was Lined With Soft Liner.For Each Patient, Radiographic Evaluation Has Been Done Immediately After Denture Insertion And After 6 And 9 Month From Prosthesis Construction. The Results In This Study Showed That There Was Statistically Significant Difference Between Both Groups In Radiographic Evaluation Regarding Bone Height But Not Bone Density.

Manar Elzanaty, Mona Shoieb, Noha A. Ghallab And Hani Essam El Nahass,

ABSTRACT
Background: Amnion Chorion Membrane Has Been Suggested In The Treatment Of Gingival Recession, Yet The Evidence Is Inconclusive. The Aim Of This Study Was To Clinically Evaluate Coronally Advanced Flap Plus Subepithelial Connective Tissue Graft Compared To Coronally Advanced Flap Plus Amnion Chorion Allograft Membrane In Management Of Patients With Miller Class I Or II Gingival Recession At 6 Month Postoperative. Methods: The Study Included Twenty Patients With 36 Teeth (6 Males And 14 Females, Aged 20 To 54 Years) Who Were Randomly Assigned To Either Group.At Baseline Clinical Parameters Were Recorded Including; Recession Depth, Recession Width, Width Of Keratinized Gingiva, Tissue Biotype, Plaque Index, Gingival Index, Probing Pocket Depth And Clinical Attachment Loss. A Coronally Advanced Flap Using The Trapezoidal Flap Technique Was Performed With The Placement Of Either The Subepithelial Connective Tissue Graft Or The Amnion Chorion Membrane.

Results: The Present Investigation Showed A Total Percentage Of Root Coverage 87.9% And 80.83% For The Subepithlial Connective Tissue Graft Group And The Amnion Chorion Allograft Group At 6 Months Respectively. The Percentage Of Complete Root Coverage Was 50% For Both Groups. Conclusion: Amnion Chorion Allograft Might Be A Suitable Alternative To Connective Tissue Graft In Procedures To Cover Denuded Root Surfaces And Can Reduce Recession Depth.

Hassan A.H. AboulAzm, Mai Mahmoud Yousry And Amir Hafez,

ABSTRACT
This Study Was Conducted To Evaluate The Effect Of Pre- And Post-bleaching On The Color Change Of Resin Infiltrated Enamel Versus Sound Enamel. M&M: A Total Of 30 Bovine Specimens Were Used, On Each; 3 Windows Were Created; Window A ?sound Control?, Window B ?demineralized? And Window C ?demineralized And Resin Infiltrated?, A Spectrophotometer Was Used To Assess Baseline Color In Each Window Then Bleaching Was Performed For All 3 Windows And Resin Infiltration Was Done For Window B Then Final Color Was Re-assessed.

Results: No Clinical Significant Difference Was Found In Color Change (?E) Of Pre- And Post-bleached Resin Infiltrated Specimens Compared To Sound Bleached. Conclusion: Pre-bleaching And Post-bleaching Resin Infiltrated Enamel Lesions Showed A Clinically Similar Color Change To Sound Bleached Enamel.

Basel Ismaeel Alhabash And Omaima El-Mahallawi,

ABSTRACT


Introduction: In Flared Canals The Misfit Of Ready-made Glass Fiber Post At Coronal Part Leads To Increased Cement Thickness At This Area With More Liability To Voids Incorporation And De-bonding Risk. Different Methods Have Been Proposed To Solve This Problem, But Still There Is No Definite Data About The Effect Of Each Technique On Mechanical Properties Of Remaining Tooth Structure.

Materials and Methods: A Total Number (n=32) Of Freshly Extracted Central Incisor With Nearly Same Length And Diameter Were Collected And Divided To Four Groups As The Follow: Group1 (control)(n=8) Remain Sound Without Any Preparation Or Endodontic Treatment, Group2,3 And 4 Received Endodontic Treatment And Intra-radicular Flared Preparation With Same Criteria And Restored As The Follow: Group2 (n=8) Restored With Radix Fiber Post, Group3 (n=8) Restored With Relined Radix Fiber Post, Group4 (n=8) Restored With EverStick Fiber Post. Coronal Portion For All Groups Were Then Restored With Nano-hybrid Composite And All Samples Were Then Individually Mounted On Epoxy Resin Blocks And Where Loaded At 135? Of The Long Axis Using A Computer Controlled Testing Machine With A Load Cell Of 5 KN. The Specimens Were Statically Loaded Until Fracture At A Crosshead Speed Of 1 Mm/min With The Steel Rod. Kruskal-Wallis Test Was Used To Study The Different Between Tested Groups. The Significance Level Was Set At P < 0.05.

Results: Intact Teeth (control Group) Showed The Highest Mean Fracture Resistance Value (462.89 � 104.51 N). The Relined Radix Fiber Post Group Showed (392.03 � 105.34 N), Radix Fiber Post Group Showed (303.15 � 95.39 N) And The EverStick Post Showed (369.77 � 107.4 N).The Difference Between The Control And Both Relined Radix And EverStick Post Groups Were Statistically Insignificant (P > 0.05). However, The Differences Between The Radix Post Groups With All Remaining Groups Were Statistically Significant (P < 0.05). Conclusion: 1. Relining Ready-made Glass Fiber Post Or Using Individually Formable Glass Fiber Post In Maxillary Teeth With Flared Canals Increase Their Fracture Resistance. 2. Increased Resin Cement Film Thickness Adversely Affects Fracture Resistance Of Teeth With Flared Canals. 3. The Fracture Value For All Tested Groups Was Higher Than Normal Masticatory Forces In Anterior Region.

Dina Ezz El Din Mohamed , Mohamed Fouad Haridy And Mohsen Hussein Abi Alhasan,

ABSTRACT


Aim: This Study To Assess The Bonding Efficiency Of Resin Composite Using Self Etch Adhesive To Dental Hard Tissues After Remineralization With Conventional Bioactive Glass.

Materials & Methods: Conventional Bioactive Glass Particles Were Prepared. A Total Number Of 25 Extracted Caries-free Human Permanent Molars Used. 5 Specimens As A Positive Control (sound Dentin), The Remaining 20 Specimens Demineralized. The Demineralized Dentin Divided Into: 5 Specimens Negative Control (demineralized Dentin) And The Remaining 15 Specimens Divided Into 3 Groups (5 Each) According To The Period Of Application Of Conventional Bioactive Glass Particles Either One Day, One Week And One Month. After De- And Remineralization Phases, Self-etch Adhesive System Single Bond Universal Adhesive (3M ESPE, St Paul, MN, USA) Was Used According To Manufacturer?s Instructions Before Resin Composite Packing. Three Micro-tubes Were Mounted On The Uncured Adhesive To Restrict The Bonding Area. The Adhesive Coat Was Then Light Cured For 10 Seconds Using A LED Light-curing Unit (Elipar S10, 3M ESPE, St Paul, MN, USA). After Curing Of The Adhesive, The Resin Composite Was Packed In The Micro-cylinders Using Endodontic Plugger. The Packed Resin Composite Light-cured For 40 Seconds Using The Same LED Light Curing Unit. The Specimens Were Stored In Distilled Water For 24 Hours Prior To Micro Shear Bond Strength (�-SBS) Testing. �-SBS Testing Was Done Using A Universal Testing Machine (Lloyd Instruments Ltd., Fareham UK).

Results: The Sound Dentin Showed The Highest �-Shear Bond Strength (MPa) Values (23.7 � 1.54) Followed By The Remineralized Dentin (16.43 � 3.49) With The Lowest �-Shear Bond Strength (MPa) Values For The Demineralized Dentin (11.63 � 1.08). Statistical Significant Differences Existed Among The Three Tested Groups (p�0.001). Conclusion: The Conventional Bioactive Glasses Is A Very Proficient Remineralizing Agent For The Demineralized Dentin. Consequently, The Microshear Bond Strength To Dentin Was Improved After Remineralization. Moreover, Application Time Of The Remineralizing Agent Has A Profound Effect On Its Reminalization Competence.

Abdu-eddaiem J. Qidarah, Mohamed A. Tawfik, Wael M. Said And Wael M. Safwat,

ABSTRACT
Objective: The Purpose Of This Study Is To Investigate The Efficiency Of The Radiological Evaluate Of The Cone Beam Computer Tomography (CBCT) In The Diagnosis And Treatment Planning Of Odontogenic Tumors. Patients And Methods: The Study Sample Included 20 Patients (11 Male, And 9 Female), With Total 20 Odontogenic Tumors (8 Cases Of Amelobastoma, 5 OKC, 4 Odontoma, 2 Myxoma And One Case Of Cementoblastoma), The Patients Age Ranged From 10 To 70 Years, With Mean Age 30 Years. That Underwent To The Clinical, Radiographic Examination (computed Tomography (CT) And Cone Beam Computer Tomography (CBCT)) And Histopathological Examination.

Results: For Anterior-posterior Liner Measurement Of OT There Were No Significant Differences (p>0.05) Between CT, CBCT And The Intraoperative Finding. Also There Were No Significant Differences (p>0.05) Between CT, CBCT And The Intraoperative Finding For Height And Width Liner Measurement Of OT. While, Presence And Absence Of Cortical Expansion And Perforation Of OT In CT, CBCT Images And The Intraoperative Finding Was Showed There Were No Significant Differences Between CT And CBCT. Also, For The Presence Of Nerve Involvement And Displacement By OT In CT, CBCT Images And The Intraoperative Finding There Was No Statistically Significant Difference Between Two Groups. For The Presence Of Teeth Involvement (root Resorption) By OT In CT, CBCT Images And The Intraoperative Finding There Was No Statistically Significant Difference Between CT, CBCT And The Intraoperative Finding. Finally, The Maxillary Sinus Involvement By OT In CT CBCT Images And The Intraoperative Finding, There Was No Statistically Significant Difference Between CT, CBCT And The Intraoperative Finding.

Conclusions: The CBCT It Has Higher Ability To Provide Valuable Diagnostic Information Compared To Conventional Radiography Even With Its Higher Cost, Which Makes CBCT First Diagnostic Tool For Detection And Localization Of Odontogenic Tumors, And Assessment Of Odontogenic Tumors Severity, And Surgical Treatment Planning For The Odontogenic Tumors.

Maii I. M. Khalil, Cherif A. Mohsen And Shams W. A. Ali,

ABSTRACT
Statement Of Problem: Color Stability Is An Important Factor To Ensure The Long-term Clinical Success Of Ceramic Restorations. The Aim Of This Study Was To Evaluate The Effect Of Repeated Firing Cycles On Color Stability Of Three Shades Of Zirconia Ceramic System. Materials& Methods: Seventy-five Ceramic Discs Were Fabricated. Discs Were Divided Into Three Main Groups According To Their Shades. Group(1) Shade A1, Group(2) Shade A3 & Group(3) Shade A4(n=25). Then Each Group Was Subdivided Into Five Subgroups According To The Number Of Firing Cycles Done (n=15) : SG(I)No Firing Cycles (control), SG(II) 3 Firing Cycles, SG(III) 5 Firing Cycles, SG(IV) 7 Firing Cycles And SG(V) 9 Firing Cycles. Color Readings Were Obtained With A Spectrophotometer Before And After Firings And L*, A*, And B* Coordinates And Total Color Variation (?E) Were Statistically Analyzed Using IBM SPSS Software.

Results: Results Revealed That For The 3 Shades (A1, A3 &A4), Color Change (DE) Had A Statistically Significant Difference Among The Four Different Firing Cycles (3, 5, 7 And 9) As Its P=0.01.Also, The Change In Color Parameters DL, Da And Db, Among The Four Different Firing Cycles Were A Statistically Significant With P=0.01. Conclusion: The L*a*b* Values Of The Ceramic Systems Were Affected By The Number Of Firings (3, 5, 7, Or 9 Firings) And Veneering Porcelain Shade (A1, A3 Or A4). L* Value Of All Specimens (at Different Shades) Was Increased Which Means That Specimens Become Lighter After Increasing The Number Of Firings. While, A* And B* Values Were Variables. The Mean Color Differences (?E) Caused By Repeated Firings Were Sometimes Below The Perceivable Level (?E<3) And Others Above This Level (?E>3) And Represent Visually Detectable Color Differences With The Change In Ceramic Shades And Firing Cycles. Clinical Recommendations: Zirconia Ceramic Restorations Should Not Be Exposed To Repeated Number Of Firings To Not Produce Detectable Color Changes.

Emad Mohamed T. Agamy, Iman A. Elasfahani And Haytham M. AbdelAal,

ABSTRACT
Objective: The Aim Of This Study Was To Evaluate The Distribution Of Stresses In Single Implant Supported Mandibular Over Denture, By Three-dimensional Finite Element Analysis (3D FEA).

Materials and Methods: A 3D Finite Element Model Of Mandibular Overdentures Was Established, Using Single Implant With Ball And Socket Attachment. The Implant Was Inserted At The Position Of Central Incisor Area. Two Types Of Loads Were Applied To The Model: Total Of 150 N Vertical And 45 Degree Oblique Loads On The Right First Premolar, Second Premolar And First Molar. The Distribution Around Peri-implant Bone, Implant, Mucosa And Overdentures Were Recorded.

Results: The Maximum Recorded Stresses Under Vertical Loading Were 25 Mpa While Under Oblique Loading Were 36.5 Mpa. No Failure Occurred In Any Part Of The Model. All Maximum Stresses Were Less Than The Yield Strength And Within The Biological Range. Conclusion And Clinical Significance: Single-implant-retained Mandibular Overdentures Do Not Show Damaging Stress Concentration Neither In The Bone Around The Implant, Different Supporting Structures Nor The Prosthesis. In This Regard It May Be Considered A Cost Effective Treatment Option For Edentulous Patients.

Aimen Al-Gobrani, Fatma A. Abdel-Sayed, Hoda M. Abdel-Aziz And Manal Y. Fouda,

ABSTRACT
Aim Of Study: The Aim Of This Study Was To Determine The Prevalence Of Malocclusion And Orthodontic Treatment Needs Among Egyptian School Children In Matrouh Governorate In The Arab Republic Of Egypt.

Materials and Methods: Asample Of 500 Children (8-12 Years Of Age ) Were Randomly Selected From Matrouh Governorate Primary Schools. Clinical Examination Were Performed At The School Clinic.The Need For Orthodontic Treatment Was Evaluated According To Index Of Orthodontic Treatment Need (IOTN). Result: Showed That Matrouh Governorate, Accepted Occlusion Represented 13.8% Of The Total Sample Malocclusion Represented 86.2% Of The Total Sample, Were 64.0% Showed Angle Class I, 14.6% Showed Angle Class II, 6.4% Showed Angle Class III, While 1.2% Showed Angle Class IV. There Were Tendency Toward Decrease In Percent Of Accepted Occlusion And Increase In Angle Class II And III Compared To Previous Egyptian Studies There Were No Sex Differences Within All Of The Occlusal Categories Dental Health Component (DHC) Of The Index Of Orthodontic Treatment Need Showed That 15.8% Of The Total Sample Were In Great Need Of Treatment, 20.6% Showed Moderate Need, While 63.6% Showed No Or Little Need For Treatment. Aesthetic Component (AC) Of The Index Of Orthodontic Treatment Need Showed That 7.4% Of The Total Sample Were In Great Need Of Treatment, 37.6% Showed Moderate Need, While 55% Showed No Or Little Need For Treatment.

Conclusions: The Percent Of Children With Great Treatment Need Regarding DHC Were (20.6%) Lower Than In Cairo (23.5%), While Regarding AC Were (7.4%) Higher Than In Mansura (4.4%). There Were No Sex Difference Within DHC And AC Components, There Were No Correlation Between Either Of DHC Or AC Components And Mixed.

Abdallah I. Al-Saadeh, Faten H.K. Eid, Fatma A. Abdel-Sayed And Hala Munir,

ABSTRACT
This Project Was Aimed To Determine The Prevalence Of Malocclusion Among School Children In Giza Governorate.

Materials and Methods: This Study Was Carried Out In Giza Governorate Where A List Of The Primary Schools And The Number Of Primary School Children Were Obtained From The Database Of The Ministry Of Education. Giza Governorate Was Divided Into Ten Regions According To Geographical Location, Two Schools Were Chosen Randomly From Each Region Using SAS Computer Software Thus, 20 Schools Were Included In This Study And A Total Number Of 1900 Schoolchildren Were Included In This Survey.

Results: Distribution Of Angle Classification: This Study Showed That 392 Children (20.6%) Had Accepted Occlusion While, 1029 Children Had Angle Class I Malocclusion Representing (54.2%) Of The Study Sample, 300 Children Had Angle Class II Malocclusion Representing (15.8%) Of The Study Sample While 163 Children Had Class III Malocclusion Representing (8.6%) Of The Study Sample And 16 Children Had Class IV Representing (0.8%) Of The Study Sample. Overjet: The Most Frequent Category Was Normal Overjet (>0?3.5mm) Which Was Found To Be (60.5%). Anterior Open Bite (<0 Mm) Was Found In (6.9%) Of The Total Sample. Conclusion: Compared To Previous Egyptian Studies, There Was A Tendency Toward Decrease In The Prevalence Of Accepted Occlusion While, There Was An Increase In Angle Class II And III Malocclusions.

Mona E, Mohamed. Z And Rasha N.S.,

ABSTRACT

Objectives: The Purpose Of This Study Was To Evaluate The Retention Of Two Non Metallic Machine Milled Crown Materials Using Two Different Adhesive Protocols. Methods: Twenty Intact Human Molars Were Used; Teeth Were Divided Into Two Main Groups According To The Crown Material Used, Each Group Has (10) Samples. Each Group Was Further Subdivided Into Two Subgroups According To The Type Of Resin Cement, Each Of (5) Samples. Standardized Tooth Preparation Was Carried Out By Milling Machine. Copings Were Fabricated Using Two Types Of Crown Materials: Lava Ultimate CAD CAM Blocks And IPS E.max CAD Blocks. Milled Copings Were Cemented To The Prepared Teeth Using Rely X U200 Self Adhesive Resin Cement And Rely X Ultimate Total Etch Resin Cement. All Samples Were Then Tested For Tensile Bond Strength.

Results: The Effect Of The Variables Combination (type Of Crown Material And Cement Type) On The Tensile Bond Strength Revealed That (Lava Ultimate With Rely X U200 Self-adhesive Resin Cement) Group Produced The Highest Tensile Bond Strength Compared With Combination Groups.

Conclusions: The Retentive Strength Of Lava Ultimate Ceramic Copings When Cemented With Self-adhesive Resin Cement Was The Highest.

Mustafa M. Nour, Ahmed R. Rajab And Ihab B. Almadany,

ABSTRACT


Introduction: Immediate Implant Placement Is Now Accepted In Clinical Dentistry Following A Single Tooth Extraction In The Posterior Maxillary Area.
Objectives: Presenting Stability And Success Rate Of Immediately Inserted Implants At The Site Of Palatal Root Socket Of Maxillary Molar Teeth After Their A-traumatic Extraction, As Well As Patient Satisfaction.

Materials and Methods: We Present The Clinical, Radiographic And Resonance Frequency Analysis Of Implants Placed Immediately In The Palatal Sockets Of Maxillary Molars. Conclusion: Using The Outlined Treatment Approach Of The Present Study Helps Eliminate Many Clinical Compromises Often Encountered When Placing Implants At The Time Of Maxillary Molar Extraction. These Compromises Include Non-ideal Implant Positioning In One Of The Three Extraction Sockets, Maxillary Sinus Pneumatization And Loss Of Ideal Alveolar Ridge Morphology As A Sequelae Of Post-extraction Alveolar Process Resorption.

Nourhan M. Hassan, Kalid A. El Hyes, Nermine Hassanin And Ahmed A. Zaki,

ABSTRACT
Aim Of The Study: Was To Assess The Photochemical Effect Of Low Level Laser Therapy (LLLT) Clinically And Radiographically On Osseointegration Of Dental Implant

Materials and Methods: This Study Included 12 Females With Clinical Diagnosis Of Missing Upper Anterior Or Premolar Teeth Were Divided Into Two Groups. Patients, Divided Into Study Group And Control Group Submitted To Treatment With LLL Using Diode Laser. Study Group Received Six Delayed Implants Were Subjected To LLLT (low Level Laser Treatment) Intraoperatively During Placement Of Dental Implant,while Control Group Received Inactive Laser Using The Same Technique And Schedule As Study Group.

Results: The Results Of This Study Revealed That In The First Interval Of Change (0-3 M) There Was No Statistically Significant Difference Between Both Groups, While In The Second Interval Of Change (3-6 M) Laser Group Showed Statistically Significantly Higher Values Than Control Group.

Abd-Elmotelb MA, Khattab N.M. And Moness A.M.,

ABSTRACT

Objectives: The Purpose Of The Study Was To Evaluate The Efficacy Of Two Different Bleaching Agents (Hydrogen Peroxide 10% Versus Carbamide Peroxide 10%) For Internal Bleaching Of Primary Teeth.

Materials and Methods: Thirty Extracted Human Primary Anterior Teeth With Intact Crowns Were Selected For The Study. Pulpectomy Was Performed And Baseline Color Evaluation With Spectrophotometer And Visual Method Was Obtained Then Each Tooth Was Artificially Stained With 2 Ml Of Fresh Rabbit Blood And Centrifuged. The Teeth Were Randomly Divided Into Three Experimental Groups Of 10 Teeth Each. 0.04 Ml Of The Each Tested Bleaching Agents Was Syringed Into The Access Cavity Of Each Tooth And, In The Control Group, 0.04 Ml Of Distilled Water Was Syringed Into The Access Cavity. Access Cavities Were Sealed With IRM. All Teeth Were Placed At 37�C In An Incubator Throughout The Experiment. The Color Of The Bleached Teeth Was Determined At 0,7 And 14 Days For Spectrophotometeric Evaluation And 0,3,7,10 And 14 Days For Visual One. The Data Obtained Were Collected, Tabulated And Subjected To Statistical Analysis Using Mann-Whitney Test.

Results: There Was Statistical Significance Among The Hydrogen Peroxide And Carbamide Peroxide Versus Control Groups Either Using Spectrophotometer Or Visual Evaluation (P=0.001). Also, There Was Significance Between Hydrogen Peroxide Versus Carbamide Peroxide At Different Observation Periods. Conclusion: The Bleaching Efficacy Of 10% Hydrogen Peroxide Gel Was More Effective Than 10% Carbamide Peroxide In Bleaching The Artificially Discolored Primary Teeth.

Hisham A. A. Qais, Hamdy A. M. Marzook And Rehab Rizk Abas El Zehary,

ABSTRACT

Objectives: This Study Was Designed To Evaluate The Influence Of Bisphosphonates And Antioxidants On Bone Healing Histologically After Surgical Defect Of Bone Tissue In Rabbits. Methods: A Total Of 60 Rabbits Were Randomly Divided Into Three Main Equal Groups: One Control Group And Two Study Groups. Three Circular 5 Mm Diameter Bony Defect Were Subjected At The Medial Surface Of The Proximal Right Tibia Using A Trephine Bur. The Bone Defects Were Left Empty (control Group, N = 20), Animals Were Treated With 0.1 Mg/kg Zoledronic Acid (Zometa) (study Group 1, N = 20), Treated With 0.1 Mg/kg Zoledronic Acid (Zometa) And Vitamin C (Cevarol) (study Group 2, N = 20). Each Group Was Divided Into 4 Subgroups (A, B, C, And D) According To The Period At Which The Animals Were Sacrificed (1, 3, 5, And 7 Weeks Respectively) For The Study And Control Groups. The Specimens Were Evaluated By Histology And Histomorphometric Analysis.

Results: There Were Highly Significant Differences Between The Groups Regarding To Amount Of Bone Formation At Different Periods Of Follow Up Either 1st, 3rd, 5th, Or 7th Weeks (P � 0.001). Also, There Were Significant Differences Between Intra- Group Distributions Concerning To Amount Of Bone Formation At Different Periods Of Follow Up Either 1st, 3rd, 5th, Or 7th Weeks ( P1, P2, And P3 � 0.001). Conclusion: In The Current Study It Was Found That, Proper Application Of Bisphosphonates And Antioxidants Managements, A Positive Improvement On Bone Tissue Healing Occurred.

Sherifa A. A. Kandil; Mohamed Riad Farid And Shereen Hafez,

ABSTRACT


Aim: Evaluate The Effect Of Different Surface Treatment To Dentin On Shear Bond Strength Of Zinc Modified Glass Ionomer Compared To Nano-filled Resin Modified Glass Ionomer And Assessment Of Tooth Restoration Interface Using Environmental Scanning Electron Microscope.

Materials and Methods: Zinc Modified Glass Ionomer (Chemfil Rock), Nano-filled Resin Modified Glass Ionomer (Ketac? N100), Dentin Conditioner (Ketac N100 Primer) And Artificial Saliva Solution Was Prepared. Eighty Eight Sound Human Premolars Were Used. Each Tooth Was Individually Embedded Vertically In The Resin Mix; Occlusal Surface Was Grounded Flat Then The Specimens Were Stored In Saline Till The Application Of Different Glass Ionomer. The Two Types Of Glass Ionomer Were Applied With And Without Ketac N100 Primer On The Prepared Specimens Then Shear Bond Strength Test Were Performed At 24 Hours And One Month. The Tested Specimens Were Photographed Using Digital Microscope To Determine Mode Of Failure While For Interfacial Analysis SEM Was Used.

Results: It Was Found That Ketac? N100 Without Dentin Conditioning At 24 Hours Had The Lowest Mean Shear Bond Test (SBS) While Chemfil Rock Without Dentin Conditioning At 24 Hours Had The Highest Mean Shear Bond Test. The Predominant Mode Of Failure In All Specimens Was Adhesive Mode Of Failure. SEM Evaluation Revealed A Gap Between Ketac? N100 And Underlying Dentin While No Gap Between Chemfil Rock And Unconditioned Dentin But With Dentin Conditioning A Gap Was Found Between The Ketac N100 Primer And Chemfil Rock

Rofaida Atef Abbas, Ragia Mohamed Mounir And Adel Hamdy Abou Elfetouh,

ABSTRACT


Aim: To Evaluate The Accuracy Of Computer Virtual Reduction Of Mandibular Condylar Fractures Based On Patient Specific Computed Tomography Scan And It?s Impact On The Surgical Procedure. Patients And Methods: Six Patients With Displaced Sub-condylar Fracture Were Treated With Trans-oral ORIF Using Computer Assisted Virtual Planning And Simulation.

Results: The Postoperative Recovery And Healing Phase Was Uneventful In All Patients. The Mean Displacement Of The Condylar Segment Was Found To Be 3.5 Mm With Standard Deviation Of 0.2 Mm In The Axial Dimension. In The Coronal Dimension, The Mean Displacement Was Found To Be 0.7 Mm With Standard Deviation Of 0.08 Mm. In The Sagittal Dimension, The Mean Displacement Was Found To Be 2.8 Mm With Standard Deviation 0.4 Mm. Conclusion: The Surgical Treatment Of Sub-condylar Fractures Of The Mandible With The Trans-oral Approach Using Computer Assisted Virtual Planning And Simulation Offers Reliable Clinical Results And Accurate Anatomical Reduction.

Mohamed Kadry Nasr Geaisa, Hesham Abdelhakam And Adel Hamdy Abouelfetouh,

ABSTRACT


Aim: To Evaluate The Validity And Reliability Of The Computer Virtual Reduction For Anterior Mandibular Fractures Based Upon Patient Specific Computed Tomography Scan. Patients And Methods: A Total Of Nine Patients With Anterior Mandibular Fractures Were Treated With Open Reduction And Internal Fixation Using Computer Assisted Virtual Planning And Simulation.

Results: All Nine Patients Showed Uneventful Healing. Acceptable Fracture Reduction In Correlation With The Planed Virtual Reduction. The Mean Displacement Of The Proximal Segment At The Mental Foramen Was Found To Be 2.3 Mm With Standard Deviation Of 0.12 Mm In The Axial Dimension. In The Coronal Dimension, The Mean Displacement Was Found To Be 0.98 With Standard Deviation Of 0.41 Mm. In The Sagittal Dimension, The Mean Displacement Was Found To Be 1mm With Standard Deviation 0.9 Mm. Conclusion: Preoperative Simulation And Visualization Can Be A Valuable Tool In Planning Of Craniofacial Surgery And Reducing The Operating Time And The Accuracy Of The Final Reduction.

Tarek F. Mounir, Mohammed F. Abdallah And Amal F. Kaddah,

ABSTRACT

Objectives: The Aim Of This Study Is To Compare The Electromyographic Muscle Activity Of Both The Buccinator And Temporalis Muscles In Patients Wearing Implants Supported Mandibular Over-dentures Using Two Different Types Of Attachments Namely: A) Bar Attachments. B) Magnet Attachments.

Materials and Methods: Ten Patients Were Selected Having Completely Edentulous Upper And Lower Arches, Divided Into Two Groups, Group A Having Implant-supported Mandibular Overdenture With Bar Attachment And Group B Having Implant-supported Mandibular Overdenture With Magnetic Attachment. In Both Groups, The Implants Were Placed In The Canine Region, Muscular Evaluation Was Performed In Each Phase During The Study By Using A Digital Electromyogram (EMG)* Muscular Activity, Represented By The Root Mean Square Value (RMS), Was Evaluated.

Results: The Data Obtained From The Present Study Showed That There Was No Significant Difference Between Bar And Magnet Attachments According To Muscular Activity Measured. Conclusion: Within The Limitations Of This Study, It Was Concluded That: In Elderly Patients, The Treatment With 2 Inter-foramina Implants Provides Evidence Of Neuromuscular Adaptation Towards Values Of Healthy Dentate, Thus The Known Benefits Of Implant Placement Such As Tissue Perseverance And Improved Function Are Complemented By Improved Neuromuscular Adaptation. II. There Was No Significant Difference Between Bar And Magnet Attachments Regarding The Muscular Activity Measured.

Ahmed Mohamed Amer, Ahmed Gamal Hamzawi And Emad MT Mahmoud Agamy,

ABSTRACT
Objective: The Aim Of This Study Was To Compare The Effect Of The Implant Position On Stress Distribution In Bilateral Distal Extension Free End Saddle (Kennedy Class I), Through Three-dimensional Finite Element Analysis (3D FEA). Method: A 3D Finite Element Model Of Mandibular Bilateral Distal Free End Saddle RPD Was Established, Using Single Implant For Support. Three Variant Implant Positions Were Studied; At The Position Of The 2nd Premolar, 1st Molar, And 2nd Molar. Unilateral Vertical Load Of (150 N) Was Applied And Distributed On The Central Fossae Of Posterior Teeth On The Right Side. The Biomechanical Behaviours Of Peri-implant Bone, Implant, Mucosa And Overdenture Were Recorded At Each Situation.

Results: The Highest Stress On Implant And The Surrounding Structures Was In The 2nd Premolar Area. The Best Stress Readings Of The Implant And The Surrounding Structures Were At The 2nd Molar Region, Except For The Periodontal Ligament Buccal Of The Right Canine; At The Same Side Of Load Application. No Overloading Was Recorded At Any Of The Supporting Structures. The Maximum Stresses Occurring At Any Part Were Less Than The Yield Strength Of The Respective Material And Within The Biological Range. Conclusion And Clinical Significance: Within The Limitations Of The Current Study; It Could Concluded That The Best Implant Location For Implant Assisted Bilateral Long Span Distal Extension RPDs, Regarding Stress Distribution, Would Be The 2nd Molar Region. Additional Research Is Recommended And Further Verification Should Be Carried Out In Clinical Cases In Order To Gain A More Accurate Clinical Guidelines.

Ehab Ahmed Farghaly, Ahmed Hassanien, Zahrah Eldawakhly And Tamer Mounir Nassef,

ABSTRACT
This Study Evaluates The Effect Of Connector Design, (radii Of Gingival Embrasure Angel 0.5 And 1 Mm), And The Veneering Techniques, (Press- On And CAD-On), On The Biomechanics Of Implant Supported Three Units Posterior All Ceramic FPD. A 3-dimentional Finite Element Models Were Constructed Representing Two Implants Together With Implant Abutments Which Were Positioned In Place Of Missing Lower Second Premolar And Second Molar In A An Epoxy Resin Full Arch Model. A Three Unit FPD Virtually Constructed Using IPS E.max ZirCAD Blocks, With A Framework 0.5 Mm Radii Of Curvature At The Gingival Embrasure Of The Connector And Another Framework With 1 Mm Radii Of Curvature At The Gingival Embrasure Of The Connector With The Two Veneering Techniques: Press-on And Cad-on Which Were Virtually Placed Over The Implant Fixtures. Load Was Virtually Applied At The Gingival Fossa Of The Pontic Similarly To The Mechanical Testing And Stresses Were Analyzed. For The Cad- On Group It Was Found That 0.5 Mm Connector Recorded Higher Von Misses Stresses Mean Value (26.37 MPa) Than 1 Mm Connector Mean Value (21.25 MPa). For The Press- On Group The 1 Mm Connector Recorded Lower Von Misses Stresses Mean Value (22.84 MPa) Than 0.5 Connector Mean Value (27.25 MPa). With 0.5 Mm Connector Curvature Design; It Was Found That CAD On Group Recorded Lower Von Misses Stresses Mean Value (26.37MPa) Than Press On Group Mean Value (27.25 MPa). And With 1 Mm Connector Curvature Design; It Was Found That Press On Group Recorded Higher Von Misses Stresses Mean Value (22.84 MPa) Than CAD On Group Mean Value (21.25 MPa). It Was Concluded That The Design Of 1 Mm Gingival Connector Curvature Radii Showed Higher Load To Failure When Compared To The 0.5mm Gingival Connector Curvature Radii Design, And CAD-on Veneering Technique Has Higher Mean Fatigue Failure Than The Press-on Veneering Technique.

Sarah M.S., Amr H. El-Bolok And Enas A.A.,

ABSTRACT
Aim Of Study: To Evaluate The Expression Of Growth Factor Receptor Bounded Protein 2 (Grb2) And Human Epidermal Growth Factor Receptor2 (HER2) In Keratocystic Odontogenic Tumor (KCOT).

Materials and Methods: 30 KCOT Paraffin Blocks Were Stained Immunohistochemically For Grb2 And HER2. Immunostaining Was Measured As Area Fraction And The Results Were Analyzed Statistically. P Value < 0.05 Was Considered Significant.

Results: All Cases Of KCOT Showed Positive Nuclear And Cytoplasmic Reaction For Grb2 And Nuclear Reaction For HER2. A Significant Positive Correlation Was Found Between HER2 And Grb2 Expression In KCOT. Conclusion: HER2 And GRB2 Play A Significant Role In The Proliferation, Pathogenesis And Progression Of KCOT. Grb2/HER2 Signaling Pathway Plays A Role In The Pathogenesis Of KCOT.

Lamia N. Metwally , Mokhtar N. Ibrahim , Omaima H. Ghallab And Amin E. Amin,

ABSTRACT

Objectives: To Evaluate The Effect Of Different Doses Of Ionizing Radiation And Storage Times On The Microleakage Of Two Different Types Of Glass Ionomer Restorative Materials; Conventional And Resin Modified.

Materials and Methods: Standardized Cylindrical Class V Cavities Were Performed In 80 Bovine Incisors. Teeth Were Divided Into Two Main Groups According To The Type Of The Glass Ionomer Material Used Restoring The Cavities; Conventional Or Resin Modified (n=40). Both Groups Were Further Divided Into Four Subgroups According To Irradiation Dose; Zero Gray (control Group), 10 Gray, 30 Gray And 60 Gray (n=10). Each Group Was Measured For Microleakage At Three Time Intervals; 3 Weeks; 6 Weeks And 12 Weeks After The End Of The Radiation Exposure. Microleakage Testing Was Performed Using Fluid Filtration Device. Values Of Microleakage In �l/min/20 Psi Were Collected, Tabulated And Statistically Analyzed. Data Was Presented As Mean And Standard Deviation Values, The Significant Level Was Set At P �0.05.

Results: Mixed Model ANOVA Showed That The Groups Of (control And 10 Gray) Had Statistically Significant Lower Microleakage Values Than (30 Gray And 60 Gray) Groups (p<0.05). There Was A Statistical Significant Effect Of The Type Of Glass Ionomer On The Microleakage. The Interaction Between The Storage Times, The Type Of Glass Ionomer And The Irradiation Doses Was Only Significant In 60 Gray Group P=0.038 For The Conventional Glass Ionomer Group And P=0.014 For The RMGI Group).

Conclusions: Within The Limitations Of This Study, It Was Concluded That: The Time Of Storage Didn?t Have Any Influence On The Microleakage Of Class V Glass Ionomer Restorations. The Variation Of The Chemical Composition Of Glass Ionomer Affected The Microlekage Of Class V Glass Ionomer Restorations And The High Therapeutic Radiation Doses Had A Direct Effect On The Microleakage Of Class V Glass Ionomer Restorations.

Omaima H. Ghallab , Rana A. Sedky And Amin E. Amin,

ABSTRACT

Objectives: The Aim Of This In Vitro Study Was To Evaluate The Effect Of Different Doses Of Ionizing Radiation On The Microleakage Of Tooth/resin Composite Restoration Interface Using Qualitative And Quantitative Methods.

Materials and Methods: Standardized Cylindrical Class V Cavities Were Prepared On The Labial Surfaces Of 40 Extracted Bovine Permanent Incisors. The Teeth Were Randomly Divided Into 4 Groups (n=10) According To The Irradiation Dose Received In Gray (Gy); (zero, 10Gy, 30 Gy& 60 Gy). The Cavities Were Restored With Resin Composite (Artiste) Using A Solvent-free Self-etching Adhesive (Bond 1 SF). After Restoration Of The Prepared Cavities, The Irradiation Doses Were Delivered As One Shot. All Specimens Were Stored In Distilled Water For Six Months Till Testing For Microleakage Using Fluid Filtration System And Dye Penetration Method. Data Was Analyzed Using One-way ANOVA, Kruskal-Wallis, Mann-Whitney And Spearman?s Correlation Tests.

Results: No Statistical Significant Effect Of Different Radiation Doses On Microleakage (P> 0.05) By Fluid Filtration Method. Dye Penetration Showed A Highly Statistical Significant Difference Between The Non-radiated And Radiated Groups (P <0.05). Fluid Filtration And Dye Penetration Assessments Showed A Weak And Non Statistical Significant Correlation.

Conclusions: Within The Limitations Of This In-vitro Study, It Was Concluded That: The Effectiveness Of Interface Assessments; Qualitative And Quantitative Seemed To Be Same. The Grays Of Ionizing Radiation Doses Did Not Affect The Interface Profile Regarding The Microleakage Assessment. The Time Elapsed In The Test Played A Great Role In Data Registration-criticism.

Eman M. Raffat , Ahmed K. Khalifa And Moustafa Abdou Elsyad,

ABSTRACT


Aim: This Study Aimed To Evaluate And Compare The Retention Of Telescopic And Milled Bar Attachments For Four Implant Supported Maxillary Overdenture.

Materials and Methods: An Acrylic Resin Model Of An Edentulous Maxilla Without Alveolar Undercuts Was Fabricated And Four Laboratory Implants Were Inserted In The Canine And Second Premolar Areas. Mucosal Simulation Was Fabricated Over The Model. Maxillary Experimental Overdenture Were Constructed Over The Model And Connected To The Model With Either Telescopic (group I) Or Milled Bar Attachment (group II). The Universal Testing Machine Was Used To Apply Vertically Oriented 4 Points Tensile Loads On A Metal Plate Attached To The Model With 4 Metal Chains Until The Attachments Separated From The Abutments. Maximum Load Needed To Dislodge The Experimental Overdenture From The Maxillary Test Model (retentive Force) Were Calculated. Initial Retentive Forces And Retentive Forces After Repeated Insertions And Removals (540 Cycles) Were Calculated.

Results: Milled Bar Attachment Recorded The Highest Initial And Final Retentive Forces, While Telescopic Attachment Recoded The Lowest One.

Conclusions: Milled Bar Attachment Recorded Significant Higher Retention Compared To Telescopic Attachment.

Hosny N S, Negm M M And Ghoneim A G,

ABSTRACT


Aim: The Aim Of This Study Was To Evaluate And Compare Smart Paste Bio Sealer With AH Plus Sealer Regarding The Push-out Bond Strength After Various Irrigation Protocols (95% Ethanol, Distilled Water, 5.25%NaOCl And QMix 2 In1).

Materials & Methods: Forty Extracted Single Canalled Maxillary Incisor Human Teeth Were Standardized To 15 Mm Length And Mechanically Instrumented Using ProTaper Universal Rotary Files To File Size F4. The Roots Were Randomly Divided Into Two Groups (n=20) According To The Filling Material Used. Group 1 (Smart Paste Bio+Propoint F4) And Group 2 (AH Plus+gutta Percha F4). Each Group Was Subdivided Into Four Subgroups (n=5) According To The Final Irrigating Solution Used Before Obturation. Subgroup A: 2ml Of 95% Ethanol. Subgroup B: 2 Ml Of Distilled Water. Subgroup C: 2ml Of 5.25% NaOCl. Subgroup D: 2ml Of QMix 2in 1. The Specimens Were Obturated With The Single Cone Technique. Then The Roots Were Sectioned Into Three Horizontal Sections Of 2 Mm Thickness, Cut From Coronal, Middle And Apical Thirds Of Each Root. Each Section Was Prepared For Push-out Test Using Universal Testing Machine.

Results: Group 1 Recorded Statistically Significant Higher Push-out Bond Strength Than Group 2. Subgroup C (5.25% NaOCl) Recorded Statistically Significant The Highest Mean Push-out Bond Strength Followed By Subgroup A (95% Ethanol) Followed By Subgroup (B) And (C) Which Recorded The Lowest Push-out Bond Strength Values. Bond Strength Values Were Significantly Higher In The Coronal And Middle Segments In Comparison To Apical Segments. Conclusion: Smart Paste Bio Sealer Produced The Highest Bond Strength Compared To AH Plus Sealer When Single Cone Technique Was Used And Bond Strength Was Differentially Affected By Irrigation Regimens.

Hesham Samy Borg, Hoda Mohamed Amin Rashad, Mohamed Maamoun El-Sheikh And Noha Ossama Abd El-Aziz Issa,

ABSTRACT
Measurements Of Inter Implant Distance Through Two Various Methods Were Evaluated And Compared.

Materials and Methods: Fifteen Completely Edentulous Patientswith Two Mandibulary Inserted Implant Were Selected For This Study. The Distance Between Two Implants Was Measured In The Computerized Way Using Cone Beam Software. The Inter- Implant Distance Was Measured By Clinical Way Using Digital Caliper. The Data Gained By 2 Ways Of Measurements Were Compared.

Results: The Calculated Mean Of Clinically Measured Inter-implant Distances Was (25.149� 4.9244) While Cone Beam Measurements Of Inter Implant Distancewas (25.375� 4.7777) Of The Same Distance Revealing No Significant Difference Between Both Method. Conclusion: No Significant Differences Between Inter Implants Distances By Using Clinical Measurements Distances And Post-operative Distances On The Cone Beam.

Sara H El-Banna, Ahmed M Halawa, Hanaa M El-Shenawy And Dina M Abdel Khalek,

ABSTRACT


Introduction: Intraoral Soft Tissue Esthetics Has Become A Significant Aspect Of Dentistry And Clinicians Are Faced With Achieving Acceptable Gingival Esthetics As Well As Addressing Biologic And Functional Problems. Aim Of Study: Was To Evaluate The Effect Of Diode Laser Irradiation On Gingival Depigmentation.

Materials and Methods: 3 Watts Continuous Mode Diode Laser Was Used To Remove Gingival Hyperpigmentation Of Dogs. Specimens Were Divided According To The Follow Up Periods Of (1, 2, 4 And 8 Weeks) Where The Experimental Specimens Were Contralateral To The Control Ones. Specimens Were Evaluated Pre- And Post-treatment Histologically Using H&E And Ultrastructurally By Transmission Electron Microscope.

Results: Histological And Ultrastructural Evaluation Revealed A Decrease In Melanin Content In The Follow Up Periods Compared To The Baseline. Meanwhile, The Recurrence Of Melanin Was Observed More In Groups Of 4 And 8 Weeks After Laser Irradiation Yet Did Not Reach The Baseline.

Mohamed Sawi Mohamed, Nadia. A. Abbas And Mohamed. F. Abdallah,

ABSTRACT
AIM: In-vitro Study Was Carried-out To Compare The Dimensional Accuracy Of Three Different Viscosities Of Additional Elastomeric Polyvinyl Siloxane Impression Material (PVS)

Materials and Methods: Fabrication Of Custom Tray On Acrylic Model (Kennedy Class II Modification Then An Impression Was Made Using Three Deferent Viscosity Of Polyvinyl Siloxane Impression Material. The Impression Was Divided Into Four Groups. Group I: Impressions Using Light Polyvinyl Siloxane, Group II: Impression Using Medium Polyvinyl Siloxane, Group III: Impression Using Heavy Polyvinyl Siloxane, Group IV: Impression Using Three Viscosities In Single Impression. Finally Measurement From Acrylic Cast Was Recorded And Compared To That Measured From The Stone Cast Poured From The Different Viscosities Of The Impression Materials.

Results: When The Three Viscosities Used Together In The Same Tray They Produced Less Accurate Cast Than Medium Alone. However It Was More Accurate Than Light And Heavy Viscosities

Rabab Ismail Abdel Fattah, Mohsen Hussein Abielhassan And Hossam El-Din Al-Mandouh El-Husiny,

ABSTRACT
The Aim Of This Study Was To Compare The Re-mineralizing Potential Of Two Novel Bioactive Glasses (BAGs), Based On The Particle Size I.e, Conventional And Nano-sized Particles In Comparison To A Conventional Commercially Available Tooth Mousse (casein Phosphopeptide ? Amorphous Calcium Phosphate CPP-ACP) On Human Enamel And Dentin. A Total Number Of 15 Extracted Caries-free Human Permanent Molars Were Used In The Study To Form 60 Enamel And Dentin Slabs. The Slabs Were Divided Into Two Groups According To The Tooth Substrate; Enamel (A1) And Dentin (A2); 30 Slabs Each. Each Group Was Furtherly Subdivided Equally Into Three Subgroups According To The Remineralizing Agent Used; Ten Slabs Each; Conventional Size BAG (B1), Nano-sized BAG (B2) And Tooth Mousse (B3). Each Subgroup Was Furtherly Divided Into Two Classes According To The Time Of Application Of Remineralizing Agent; Five Slabs Each; Two Minutes (C1) And Eight Minutes (C2). Slabs Were Soaked In A Demineralizing Solution For Two Days. Treated Specimens Were Subsequently Stored In Artificial Saliva (pH 7.4), At 37�C For Seven Days. Artificial Saliva Was Replaced With Fresh One Every 24 Hours. Specimens Were Analyzed, Both Quantitatively And Qualitatively Using EDAX And ESEM Respectively After Both Demineralization And Remineralization Times. EDAX Revealed That All Remineralizing Agents Had Remineralizing Potential When Applied On Enamel And Dentin Except For Conventional BAG And CPP-ACP When Applied For Two Minutes On Enamel.

Sana M. Mansour, Essam E. Al-wakeel And Neven S. Aref,

ABSTRACT


Purpose: This Study Investigated The Effect Of Microwave Post-polymerization Treatment Of Bulk- Fill Resin Composite Used As Indirect Restoration Regarding; Degree Of Conversion, Surface Micohardness, Compressive Strength And Fracture Toughness.

Materials and Methods: Two Nanohybrid Resin Composites Were Used In The Study; One Is Incrementally-placed And The Other Is Bulk-fill. For Each Test, Ten Specimens Of Each Resin Composite Type Were Prepared According To Manufacturer?s Instructions (group I And II) And Divided Into Two Equal Subgroups; One (Ia And IIa) As A Control And The Other Subgroup (Ib And IIb) Exposed To A Microwave Post-polymerization Treatment At 550 W For 4 Min. The Degree Of Conversion, Compressive Strength, Surface Micohardness And Fracture Toughness Of The Different Groups Were Calculated. Student?s T-test Was Used To Analyze And Compare The Collected Data (p < 0.05).

Results: Bulk-fill Resin Composite Exhibited A Significant Increase In The Compressive Strength, And Fracture Toughness Mean Values Than Those Of The Incrementally-placed One. For Both Incrementally-placed And Bulk-fill Resin Composites, Significant Differences Between The Degree Of Conversion, Compressive Strength, Surface Micohardness And Fracture Toughness Means Of The Microwave-treated Group And Those Of The Control Group Were Detected.

Conclusions: Microwave Post-polymerization Treatment Is A Valuable Technique For Enhancing The Degree Of Conversion, Compressive Strength, Microhardness And Fracture Toughness Of Nanohybrid Resin Composites, Either Bulk-fill Or Incrementally-placed One When Used As Indirect Restoration. Bulk-fill Resin Composite Is A Material Of Choice For Indirect Restorations (inlays And Onlays).

Aliaa A Refaie, Ahmed H Wahba And Salwa M Awad,

ABSTRACT
Objective: The Purpose Of This Study Was To Investigate The Effect Of Dentists? Appearance And Decoration Of The Dental Clinic On Child Anxiety Using Frankl Scale For Behaviors And Facial Image Scale. Methods: The Study Was Conducted On 280 Children Their Age Ranged Between 3-6 Years. They Had Been Selected From Pediatric Dentistry Clinic, Faculty Of Dentistry, Mansoura University. The Children Were Randomly Divided Into Two Main Groups According To The Sample Design. In The First Group, Anxiety Of 240 Children Were Evaluated In Relation To Different Variables Of Dentists? Appearance ( Age ,sex ,attire, Protective Wear). In The Second Group, Anxiety Of Other 40 Children Were Evaluated In Relation To Different Clinic Decoration (general Design Or Pediatric Design) Researcher Had Standard Dentists? Appearance (white Coat With Standard Protective Wear). All Participated Children Were Subjected To Examination; Polishing, Excavation (debris, Soft Caries) And Application Of Temporary Filling. Their Behaviors Were Recorded By Researcher According To Frankl Scale And They Asked To Select Their Anxiety Level Using FIS.

Results: In The First Group, Children?s Anxiety Decreased When They Were Treated By Female Operators Wearing Pediatric Coat And Decorated Protective Wear .However, Anxiety Increased With The Operators Wearing Surgical Scrub And Standard Protective Wear. In The Second Group, Children Were Very Happy To Be Treated In Pediatric Dental Clinic Design Over General Dental Clinic Design. There Was High Statistically Significant Difference (p<0.001). Conclusion: Children Have Strong Preferences Regarding The Appearance Of Their Dentist And Dental Clinics .That Could Greatly Improve A Patient?s Perception Of The Care They Receive. Children?s Anxiety Decreased With Female Operators Wearing Pediatric Colored Coat And Decorated Protective Wear. Also, Children Were Very Happy To Be Treated By Operator Of The Same Gender And In Decorated Dental Clinic Design.

Injy A. El-Sebaie, Nagwa A. Ghoname, Hussein I. Saudi And Rasha A. Alm El-Din,

ABSTRACT
It Is A Dental Disaster For Child To Lose His Primary Teeth Before The Age Of Normal Exfoliation. There Is No Better Replacement Than The Natural Tooth When It Is Rendered Free Of Infection.
Objectives: This Study Was Performed To: 1) Evaluate The Clinical And Radiographic Effect Of 3Mix Compared To 15 Concentration Of Buckley?s Formula Of Formocresol As A Pulpotomy Agent In Non-vital Primary Molars. 2) Assess Their Antibacterial Effect Of 3Mix And 15 Concentration Of Buckley?s Formula Of Formocresol.

Materials and Methods: In This Clinical Trial, Non-vital Pulpotomy Was Performed On 60 Primary Mandibular Molars Out Of 30 Children Aged Four To Seven Years. The Teeth Were Randomly Divided Into Two Groups According To The Material Used With 30 Teeth In Each Group. Group I, The Teeth Were Treated In One Visit Using 3 Mix. Group II, The Teeth Were Treated In Two Visits Using 15 Formocresol. All The Teeth Were Sealed With Glass Ionomer Cement Then Finally Restored With Stainless-steel Crowns. Clinical And Radiographic Evaluation Was Carried Out At Three, Six, And Nine Months Intervals. The Antibacterial Effect Of 3 Mix And 15 Formocresol Against Escherichia Coli And Staphylococcus Aureus Were Determined By Agar Diffusion Method. �

Results:�The Overall Clinical Success Rate Was 96.2% In 3Mix Group Compared To 85.1% In Formocresol Group. While, Radiographic Success Rate Was 85.1% And 77.7% In Both Groups Respectively. No Statistically Significant Differences Were Found Between The Two Groups Clinically Or Radiographically. The Antibacterial Results Showed That 3Mix Presented The Largest Inhibitory Zones Against Escherichia Coli And Staphylococcus Aureus Compared To 15 Formocresol With Statistically Significant Difference Between The Two Tested Materials.

Conclusions:�The Triantibiotic Paste (3Mix) Is A Promising Material In Fulfilling Its Role In The Treatment Of Non-vital Primary Molars Through Non-instrumental Endodontic Treatment.

Aisha Ali Abdo Albahbah, Moustafa Abduo Elsyad And Radwa M.K. Emera,

ABSTRACT


Purpose: This Study Aimed To Evaluate Of Different Degrees Of Lingual Implant Inclination On Retention Of Locator Attachments Used For 2-implant Retained Mandibular Overdentures .

Materials and Methods: Four Identical Acrylic Resin Models Representing A Completely Edentulous Mandibular Ridges Were Used. Each Model Received Two Implants Inserted At Canine Area Bilaterally With Different Degree Of Lingual Inclination. Group I (0,control), Group II (5), Group III (10), And Group IV (20). For Each Degree Of Implant Inclination Retention (vertical Dislodging Forces). The Residual Ridge And The Retromlar Regions For Each Acrylic Resin Model Was Covered By Base Plate Wax To Simulate The Oral Mucosa. Four Acrylic, Metal Reinforced Overdenture Was Fabricated And Connected To The Implants Using Locator Attachments. U Tilizing The Universal Testing Machine, Vertical And 3 Types Of Rotational (anterior, Lateral And Posterior) Dislodgments Were Performed On A Metal Plate Attached To The Model With Metal Chains Until The Attachments Separated From The Abutments. The Initial Retentive Force (maximum Dislodging Force) And Final Retention After 540 Cycles Of Insertions And Removals Were Measured For Each Example. Results : For Initial Retentive Force And Retentive Force After Repeated Insertions And Removals, 0 Degree Inclination Recorded The Highest Retentive Forces, Followed By 5 Degrees, And 10 Degrees (whitout Significant Differences ) And 20 Degree Recoreded The Lowest Retention Values.Locator Transparent Recoreded The Highest Retentive Force, Followed By Locator Nylon Pink, Locator Nylon Blue, Locator Nylon Green, And Locator Nylon Red Recorded The Lowest Retention Values.

Conclusions: For Parallel (0o), And Medium (10o) Inclination, The Highest Initial And Final Retention And Stability Was Noted With Transparent Inserts, Followed By Pink Inserts, And Blue Inserts Showed The Lowest Values. For Slight Inclination (5o), The Highest Initial And Final Retention And Stability Was Noted With Blue Inserts. For Sever Implant (20o) Inclination, The Highest Initial And Final Retention And Stability Was Noted With Transparent Inserts And The Lowest Values Were Noted For Red Inserts.

Mona Mahmoud Mohamed, Mai Mahmoud Yousry And Amir Hafez Ibrahim,

ABSTRACT
This Study Was Conducted To Evaluate The Effect Of Curing Direction (occlusal And Transtooth Polymerization), And Curing Time, As Well As The Influence Of Remaining Wall Thickness, As Reflected By Cavity Width On The Depth Of Cure Of Bulk-fill Resin Composite Proximal Restorations.

Materials and Methods: A Total Of 40 Sound Human Maxillary Premolar Teeth Were Used In This Study. The Occluso-gingival Height Of Teeth Was Of A Minimum Of 4.3mm And The Bucco-lingual Dimension Of The Selected Teeth Was 8.6-10.5 Mm; All Dimensions Were Measured Using A Digital Caliper. The Teeth Were Divided Into 2 Groups Of 20 Each According To The Curing Direction; Either Occlusal Curing According To Manufacturer?s Instructions, Transtooth Curing From The Buccal And Lingual Direction. Standardized Box Shaped Cavities Were Prepared On Proximal Surfaces Of Each Tooth Having Occluso-gingival Depth Of 4 Mm, Axial Wall Depth 1.5 Mm And 3 Mm Bucco-lingual Width. All Prepared Cavities Were Restored Using X-tra Fil Bulk Fill Resin Composite Placed In One 4 Mm Increment And Then Cured. Each Specimen Was Then Sectioned In A Mesio-distal Direction And Each Half Was Poured In Acrylic Resin Block. Then, Vickers Hardness Number (VHN) Was Determined On The Top And The Bottom Surfaces (0.1 From Occlusal Surface And 0.1 Mm From Gingival Wall) Using Digital Display Vickers Micro-hardness Tester. Two Way ANOVA Was Used To Study The Effect Of Different Curing Direction.

Results: The Tested Bulk-fill Resin Composite (X-tra Fil) Achieved At Least 80% Depth Of Cure Value At 4mm Thickness With Irradiation Time 10 Seconds. Regarding The Curing Direction, A Non-significant Difference In Depth Of Cure Between Occlusal And Transtooth Curing Was Revealed (P>0.5). The Bottom Microhardness Also Showed A Non-significant Difference Between Curing Directions (P>0.5). While For Top Microhardness, Occlusal Curing Showed Significantly Higher Value Than Transtooth Curing (P>0.5). Conclusion: An Acceptable Depth Of Cure Could Be Achieved With 4mm Increment Of Bulk-fill Resin Composite.

Amr M. Ali Elsayed Aboulenain, Abeer Mostafa Abdellatif And Rizk Abd-Alla I. El-Agamy,

ABSTRACT
Background: Many Measurement Techniques Have Been Used To Examine The Psychological Condition Of Children During Dental Procedures, Including Behavioral Ratings, Psychometric Scales, Self-reports, And Projective Techniques. Communication Is Multisensory, However The Most Common Means Of Communication With Young Children Is Through Spoken Language As The Second Language Often Makes The Dental Procedure More Acceptable To Patients. Aim Of The Study: This Study Was Conducted To Study The Effects Of Different Modifications Of Second Language On Child?s Behavior In The Dental Office. Materials And Method: This Study Was Conducted On A Total Of 180 Healthy Egyptian Pediatric Dental Patients (90 Boys And 90 Girls) In The Pediatric Dental Clinics Of Faculty Of Dentistry, Mansura University, Egypt. They Comprised Three Equal Groups Of Males And Females For Performing Restorative Or Pulp Therapy Under Local Anesthesia Using Different Word Substitutes During The Procedure. Each Group Was Dealt With Using A List Of Word Substitutes For The Different Instruments And Tools In Two Stages: Pre-operatory Stage (before Anesthesia) And Operatory Stage (after Anesthesia And During The Procedure). The Child?s Behavior Was Rated During The Treatment Session By Using Frankle Scale And Venham 6 Point Index. At The End Of Dental Treatment, Each Child Was Asked To Name Each Instrument And Tool We Showed To Him /her During The Procedures. All Data Were Recorded In A Specially Designed Sheet.

Results: There Was A Clear Positive Correlation And Agreement Between A Suitable Second Language And Child?s Behavior In All Stages Of Dental Treatment. The Majority Of Children Showed Low Stress And Positive Perception Toward Dental Treatment. With Respect To Gender There Was No Significant Difference Between Males And Females In Assessment Of Child?s Behavior. Conclusion: The Use Of Second Language Plays A Major Role In The Interaction Between The Pediatric Dentist And The Child Patient And The Easier The Word Substitute, The Better Is The Behavior Of Children In The Dental Clinic. There Was A Clear Positive Correlation And Agreement Between Good Suitable Second Language And Child?s Behavior In All Stages Of Dental Treatments.

Khouloud Mohamed Zaher, Rana Mahmoud Sherif And Maha Ahmed Taymour,

ABSTRACT
Objective: The Aim Of The Study Was To Assess The Fracture Resistance Of IPS E.max CAD (E) Compared To VITA Suprinity(S) Crowns. Methods: A Stainless Steel Die Was Custom Made To Simulate Mandibular First Molar Preparation, Then It Was Duplicated Into Twenty Epoxy Resin Dies. After Scanning The Stainless-steel Die, The Crowns Were Milled. The Samples Were Randomly Divided In To Two Equal Groups (n=20) According To The Material Type (E And S). After Milling, The Crowns Were Finished, Polished And Glazed Prior To The Crystallization Process. The Crowns Were Then Cemented. All Samples Were Subjected To Fracture Resistance Testing Under A Compressive Load Of 5(KN) And At A Crosshead Speed Of 1 Mm/min. Data Was Collected, Tabulated And Statistically Analyzed. The Failure Mode Was Then Examined Photographically Using A Digital Camera.

Results: The Fracture Resistance Testing For The Samples Of Group (E) And (S) Showed That There Was No Statistical Significant Difference Between The Two Groups Where The Mean Values Were ((1767.88�258.55 N) And (1505.73�91.48 N) Respectively. Both Materials Showed Favorable And Unfavorable Pattern Of Failure. Conclusion: The IPS E.max CAD And VITA SUPRINITY Both Showed High Fracture Resistance Values And Thus Can Be Safely Used In The Posterior Region.

Yousra Samir M. Helmy, Mohamed Sherif M. Salah El Din Hassan Farag, Ola Mohamed Ibrahim Fahmy And Ghada Abd El-Hamid El Baz Younes,

ABSTRACT


Aim: This Study Was Conducted To Compare The Sealing Ability And The Micro-morphological Changes Of The Tooth/restoration Interface Throughout 3 Months Storage Period Of Self-adhesive Flowable Restorative Resin Composite And A Conventional Flowable Restorative Resin Composite With Its Corresponding Self- Etch Adhesive System.

Materials and Methods: A Total Of Thirty Extracted, Caries-free, Premolars Were Prepared With A Standardized Cavity Preparations, Fifteen Of Which Were Restored With The Self- Adhering Flowable Composite And The Other Fifteen Teeth Were Restored With The Conventional Flowable Composite With Its Corresponding, One- Step Adhesive System. Each Group Was, Furtherly, Subdivided Into T1, T2 And T3 For Three Storage Periods Of 1 Week, 1month And 3 Months Respectively. Samples Were, Then, Prepared For Marginal Microleakage And Scanning Electron Microscope Evaluations.

Results: There Was No Significant Difference Between The Microleakage Values Of The Two Materials At Each Different Storage Period. As Well As, Over The Whole Storage Period. The SEM Evaluation Of Both Restoratives Showed That, The Restoration/enamel Interface Seems To Be With Minimal Gaps When Self- Adhering Flowable Composite Was Used But Was Similar At The Dentin Interface. Regarding The Effect Of Time, No Obvious Significant Changes Occurred At The Tooth/restoration Interface, For Both Materials, Along The Tested Periods. Conclusion: The Sealing Ability Of Both Tested Restorative Materials, Regardimg The Microleakage Assessment And The SEM Evaluation Of The Tooth/restoration Interface, Was Almost Similar When Tested, At Different Storage Periods In Vitro.

Ahlam A. Othman , Hesham A. Katamish And Atef I. Shaker,

ABSTRACT
Statement Of Problem: Lack Of The Shock-absorbing Effect Of Periodontal Ligament Around Dental Implants Makes Them Highly Susceptible To Excessive Loads, Leading To Peri-implant Bone Loss And Implant Failure.

Purpose: The Aim Of This Study Was To Evaluate The Effect Of Implant Platforms, Abutment Designs And Crown Materials, On Strains Developed In The Implant Supporting Structures.

Materials & Methods: Thirty Titanium Fixtures Were Embedded In Thirty Especially Designed Mandibular Models In The First Molar Area. Titanium Or Customized Zirconia Abutments Were Fixed Over The Implants, Then Zirconia Or Lava Ultimate Crowns Were Fabricated And Cemented On Their Respective Abutments According To Experimental Groups. A Total Number Of 30 Samples Were Prepared. They Were Divided Into Five Groups ?6 Samples Each?? According To The Different Implant/abutment/crown Complexes: Group I: Switched Implant Platform With Two-piece Zirconia Abutment And Lava Ultimate Crown. Group II: Switched Implant Platform With Two-piece Zirconia Abutment And Zirconia Crown. Group III: Switched Implant Platform With Titanium Abutment And Lava Ultimate Crown. Group VI: Switched Implant Platform With Titanium Abutment And Zirconia Crown. Control Group: Regular Implant Platform With Titanium Abutment And Zirconia Crown. The Restorative Complex Was Fatigued In A Chewing Simulator Machine (ROBOTA). Strains Developed Around The Implants Were Measured Using Strain Gauges. Results Were Collected, Tabulated And Statistically Analyzed.

Results: The Highest Strain Was Observed In The Control Group With Regular Implant Platform (116.1 �m/m) In Comparison With The Other Four Groups With Platform Switching Concept. Within The Platform Switching Groups, There Was No Statistically Significant Difference In The Strains Generated Around The Two Abutment Designs Regardless Of Crown Materials. However, Lower Strains Were Developed Around Lava Ultimate Crowns (118.5 �m/m) When Compared To Zirconia Crowns (163.4 �m/m) Regardless Of Abutment Designs.

Conclusions: Platform Switching Concept And Softer (less Rigid) Crown Materials (Lava Ultimate Are Preferred In Implant-supported Crowns, Especially In High Stress Areas When Compared To Regular Platform And Zirconia Crowns. However, The Abutment Design Has No Influence On The Strains Induced In The Supporting Structures.

Ramy Elmoazen , Mohamed Sherif Salah Eldin And Wael Mahmoud Abd Elkhalek,

ABSTRACT
Background: Secondary Dentine Is Deposition Along The Wall Of The Dental Pulp Chamber Leading To A Reduction In The Size Of The Pulp Cavity With Age. Objective: Investigate The Three Dimensional Volumetric Change Of The Root Canal Systems Of Mandibular Canines Teeth In And To Correlate The Findings With The Patient?s Age And Gender.

Materials and Methods: 150 Randomly Selected Cone Beam Computed Tomography (CBCT) Images For Different Age Groups Were Used To Calculate Pulp/tooth Volume In Mandibular Canines And Analyze Volume Change By Age.

Results: Strongest Negative Correlation Between The Pulp?tooth Volume Ratio And Age Was Measured On Canines (r= -0.886, -0.850 In Males And Females Respectively).

Conclusions: Volume Changes Of The Pulp Chamber In Intact Teeth Can Be Considered As A Dental Age Predictor.

Shaimaa A Negem, Laila S Ghali And Wael M Abd Al Khalek,

ABSTRACT


Purpose: The Aim Of This Study Is To Evaluate The Changes Of Surface Hardness And Remineralizing Effect Of Nano-carbonate Apatite On Demineralized Stripped Enamel Surfaces By SEM And Micro-hardness Examination.

Materials & Methods: Forty Five Extracted Premolars Received Proximal Stripping Using Diamond Coated Metal Hand-held Strip. Each Tooth Was Sectioned By Means Of A Low-speed Air And Water-cooled Diamond Disc Along Its Major Axis Into Mesial And Distal Halves I.e. Obtaining 90 Tooth Sections (30 Unstripped &60 Stripped) And Divided Into 3 Groups: Group A (A1 15 Unstripped; A2 15 Stripped) Served As Control. Group B (B1 15 Unstripped; B2 15 Stripped) Specimens Were Placed In Lactic Acid For 1h Three Times A Day With 2h Preservation In Artificial Saliva In Between For 7 Days. Group C (C1 15 Stripped; C215 Stripped) Specimens Were Received Same Treatment As Group B Then Treated With Remineralizing Agent (APF For C1& N-CAP For C2) Immediately After Each Demineralizing Bath.

Results: SEM Results Showed Greater Demineralization In Subgroup B2 Compared To B1, While It Revealed Greater Remineralization In Subgroup C2 (n-CAP) Compared To C1 (APF). Surface Microhardness Examination Results Using Mann-Whitney Test Showed Significant Decrease In SMH Of Group B2 Compared With (A). SubgroupC1 (APF) Showed Increase In SMH Compared With Subgroup B2 With No Significant, And Decrease Compared With Group (A). While There Was No Significant In SMH Of Subgroup C2 When Compared With Group (A),however There Was Highly Significant Increase In SMH Of Supgroup (C2) Compared With Those Of Subgroup B2 Followed By Subgroup C1. Conclusion: N-CAP Could Be Considered As A Valuable Non-fluoride Alternative To Fluoride Containing Formulations Used For Suppressing Demineralization And Enhancing Remineralization Of Enamel. It Can Be Considered As A Potential Caries Preventive Agent Showing Promise For The Recovery Of Damaged Enamel Structures.

Hosny Bakheet Abdel-Rahman Enas Fathelbab Abdel-Halim And Shams Waaz Amgad,

ABSTRACT

Objectives: The Aim Of This Study Was To Evaluate The Marginal Accuracy Of Machinable Ceramics Luted With Different Resin Cements.

Materials & Methods: Forty Full Contoured Anatomical Crowns Were Constructed From Two Different CAD/CAM Ceramic Materials (Zirconzahn And IPS E.max CAD). Specimens Were Divided Into Two Groups (twenty Crowns Of Each) According To The Used Ceramic Material. Each Group Was Then Subdivided Into 2 Subgroups According To The Type Of The Luting Cement Used (self-adhesive Resin Cement And Resin Modified Glass Ionomer Cement). Crowns Luted To Their Corresponding Prepared Epoxy Dies With The Selected Cement Type. Specimens Were Subjected To Thermocycling. Marginal Gap Of Each Crown Was Measured By Direct Viewing Under Computer-aided Stereomicroscope At 45? Magnification. Each Crown Was Then Vertically Sectioned. The Surface Of Each Section Was Digitally Photographed Under Computer Aided Stereomicroscope At 9 Reference Points. Marginal And Internal Gap Mean Values Were Collected, Tabulated And Statistically Analyzed.

Results: Lithium Disilicate Crowns Luted With Self-adhesive Resin Cement Recorded Statistically Significant Highest Marginal And Internal Gap Mean Values Followed By Zirconia Crowns Luted With Resin Modified Glass Ionomer Cement Then Lithium Disilicate Crowns Luted With Resin Modified Glass Ionomer Cement While Zirconia Crowns Luted With Self-adhesive Resin Cement Recorded The Lowest Statistically Significant Marginal And Internal Gap Mean Values.