Amani Ahmad Al Tuwirqi ,

Background/Purpose : Prevention And Management Of Proximal Caries In Primary Teeth Remains A Challenge. This In Vitro Study Aimed To Evaluate The Enamel-protective Potential Of A New Adhesive Agent (G-Coat Plus?) When Used As A Smooth Surface Sealant

Materials and Methods: Twenty Extracted Bovine Permanent Incisors Were Chosen, Then Randomly Distributed Into Two Equal Groups According To The Sealant Material Used: Group I, G-Coat Plus?; And Group IT, Clinpror"" . The Baseline Surface Microhardness (B-SMH) Of Each Tooth Was Measured In The Area Of The Centralized Working Window With A Vickers Microhardness Testing Machine. The Mean Microhardness Values Were Calculated From The Measurements Taken From Three Indentations Created On Each Tooth. The Teeth Were Then Immersed In Demineralizing Solution For 96 H And Incubated At 3rC To Produce Artificial Carious Lesions. The Calcium (Ca) And Phosphorus (P) Concentrations Of The Demineralizing Solutions Were Analyzed Before And After Tooth Immersion.

Results: The Mean Microhardness Values For Groups I And IT Were Statistically Significant At Baseline And After Demineralization (p = 0.007 And P < 0.001 , Respectively). No Significant Difference In Mean Microhardness Was Observed Between The Groups At Baseline (p = 0.055) Indicating That Both Materials Had Comparable Results. However, The Difference In Mean Microhardness Between The Groups Was Statistically Significant After Demineralization (p = 0.001), Indicating Changes In The Mineralization Of The Tooth Samples. Statistical Analyses Demonstrated Significant Differences Among The Two Groups Regarding The Mean Ca And P Concentration Values (Ca:, P = 0.028; P, P < 0.001).Conclusion: G-Coat Plus Exhibited Higher Surface Microhardness Than Clinpro. Both Sealant Materials Released Ca And P Ions, Suggesting That Additional Preventive Measures Are Necessary When Using These Materials As Proximal Sealants.

Rasha Saad Zaghlool, Mona Ismail Riad And Mohamed Mostafa,

Purpose: The Aim Of This Study Was To Evaluate The Fluoride Release Of New Bioactive Composite Restorative Material (Activa) In Comparison To Two Fluoride Releasing Materials In Vitro At Different Time Intervals.

Materials and Methods: Thirty Specimens Were Prepared 10 Of Each Tested Material (n = 10/ Group), Activa Bioactive Composite (AI), FUJI IT LC Capsules (A2) And Fuji IX Extra Capsules (A3). Specimens Were Prepared According To Manufacturers" Specifications For Each Group Using A Teflon Mold (lOmm Diameter By 2mm Depth). Specimens Of Each Material Were Immersed Separately In Deionized Water. Fluoride Release Measurements (?g/cm /day) Were Madel Day, 1 Week, 1 Month, 2 Months And3 Months. One-way And Repeated Measures Analysis Of Variance Tests Were Used.

Results: The Results Of The Tested Materials Were Collected, Statistically Analyzed Using The ANOVA Test To Determine The Amount Of Fluoride Release Between Different Tested Materials (p

Abdelrahman G. Ahmed , Cherif A. Mohsen And Shams W. Amgad,

Objective The Purpose Of This Study Was To Evaluate The Effect Of Ceramic Type And Thickness On The Microhardness And Degree Of Polymerization Of Dual Cure Resin Cement.

Materials and Methods: - Ninety Resin Cement Disc Shaped Samples (5 Mm In Diameter And 0.5 Mm In Thickness) Were Fabricated, Samples Were Divided According To Type Of Ceramic Plate That Was Used Into Three Groups (each Group N = 30), Group I : Resin Cement Discs Cured Through Lithium Disilicate Plate. ?IPS E.max Cad?, Group II : Resin Cement Discs Cured Through Hybrid Ceramic Plate ?Vita Enamic? And Group III : Resin Cement Discs Cured Through Zirconia Reinforced Lithium Silicate Plate ?Celtra Duo? . Each Group Was Subdivided Into 3 Sub Groups According To Ceramic Plate Thickness (each Subgroup N = 10), Sub Group I (0.5 Mm Thickness), Sub Group II (1 Mm Thickness) And Sub Group III (2 Mm Thickness) . Then Each Subgroup Was Divided Into Two Other Classes (5 Samples Each) According To Type Of Test (Microhardness, Degree Of Conversion (DC)) Test.samples Which Will Have Being Tested For Microhardness ,mounted In Wilson Micro-Hardness Tester Machine And Will Be Subjected To Static Load Of 50 G For 10 S By Means Of Indenter , A Calibrated Microscope (?50 Magnification) Will Be Used To Measure The Square Indentation. While For Degree Of Conversion Test, The Samples Were Examined By VERTEX 70v FTIR Spectrometer Equipment Operating At 16 Scans At 4cm-1 Resolution . By Using The Change In The Ratio Of The Aliphatic C=C To The Aromatic C=C Before And After Curing, DC Of Resin Was Calculated. The Data Was Collected, Tabulated And Statistically Analyzed. Result: It Was Found That The The Highest Microhardness Mean Value Was Recorded For Emax Groups (22.15?5.04) While The Lowest Microhardness Mean Value Was Recorded For Celtra Duo Groups Which Recorded (16.79?3.62). Besides, It Was Found That The Highest Microhardness Mean Value Was Recorded For Thickness 0.5 Mm Groups (23.62?2.94) While The Lowest Microhardness Mean Value Was Recorded For 2 Mm Groups Which Recorded (13.87?1.56). The Difference Between Groups Was Statistically Significant As Indicated By One Way ANOVA Test P Value < 0.05 For DC Test It Was Found That The Highest (DC) Mean Values Recorded For E-max (36.30?8.84) And The Lowest For Celtra Duo (21.44?8.61) And The Highest DC Mean Value Was Recorded For Thickness 0.5 Mm Groups (38.33?5.91) While The Lowest DC Mean Value Was Recorded For 2 Mm Groups Which Recorded (19.27?5.90).The Difference Between Groups Was Statistically Significant As Indicated By One Way ANOVA Test (P Value < 0.05) Conclusion: Ceramic Composition Affects Polymerization Of Dual?cured Resin Cement Due To Attenuation Of Light Reaching Cement. In This Study, Microhardness And Degree Of Polymerization Of Resin Cement Discs Cured Through Emax Plate Was Significantly Greater Than Vita Enamic Followed By Celtra Duo Plates. Ceramic Thickness Has A High Significant Effect On The Underlying Dual Cure Resin Cement MicroHardness Of The Dual Cure Resin Cement Are More Affected By The Thickness Of Ceramic Than By The Type Of Ceramic Used.

Mustafa Mahmoud Shalaby Ahmed, Wafaa Ahmed Omar And Marwa Mahmoud Ali Bedier,

Aim: This In Vitro Study Was Carried Out To Evaluate The Effect Of Lowering The Temperature Used With Continuous Wave Compaction (CWC) From 200?C To 150?C On The Push-out Bond Strength And Interfacial Adaptation Of TotalFill BC Sealer In Relation To AH Plus Sealer.

Materials and Methods: A Total Of Eighty-eight Extracted Human Single-rooted Teeth With Single Straight Root Canals Were Selected For This Study. The Samples Were Randomly Allocated Into Four Groups (n=22) According To The Type Of Sealer Used And The Temperature Of Warming Gutta-percha; (AH Plus/ 150?C), (AH Plus/200?C), (TotalFill BC/150?C) And (TotalFill BC/200?C) Groups. The Roots Were Sectioned Horizontally Into 2 Mm. Thick Slices, And The Bond Strengths Were Measured Using A Standardized Push-out Test. The Mode Of Failure Was Examined By Visual Inspection Under Stereomicroscope. Before The Push-out Test, Five Representative Samples From Each Group Were Randomly Selected To Qualitatively Assess The Interfacial Adaptation Using Environmental Scanning Electron Microscopy (ESEM).

Results: The Mean Push-out Bond Strength Values Of The Two Sealers Recorded Significant Lower Values At 150?C Than At 200?C. The Predominant Mode Of Failure Among Groups Was Adhesive Failure, Except For TotalFill BC/200?C Group That Showed Mostly Mixed Failure. Regarding The Interfacial Adaptation, The Mean Gap Width Measurement At 150?C Was Wider Than That At 200?C For Both Sealers.

Conclusions: Using 150?C During CWC Technique Compared To 200?C Significantly Decrease The Bond Strength Values And The Interfacial Adaptation Of TotalFill BC Sealer As Well As AH Plus Sealer.

Osama Jaber Sabri Alshanti, Amr Saleh El-Etreby And Gihan El-Naggar ,

Objective: The Aim Of The Present Study Is To Evaluate The Effect Of Two Surface Treatments (acid Etching And Sandblasting) On The Shear Bond Strength Of Composite Resin Cement To Pressed And Repressed Lithium Di Silicate Ceramics. Patients And Methods: Fifty Two Lithium Disilicate Discs Were Constructed Of 10mm Diameter And 2mm Thickness And Were Divided Into 2 Groups. Group (P) Composed Of 26 Discs Constructed From Newly Introduced Lithium Disilicate Ingots While Group (R) Composed Of 26 Discs Constructed From Left Over Material That Was Shaped To Resemble An Ingot.

Results: The Discs Were Thermo-cycled In An Attempt To Simulate The Intra-oral Conditions And Its Detrimental Effect On Bond Strength For 5,000 Cycles Which Is Equivalent To 6 Months Of Intra-oral Service And Then The Shear Bond Strength Test Was Initiated. Then The Mode Of Failure Was Examined And All Data Were Collected, Tabulated And Statistically Analyzed To Detect Any Significant Values Among The Tested Groups. Conclusion: The Re-use Of E.max Press Left Over Buttons For Construction Of All Ceramic Restoration Could Be Considered For Socio-economic Reasons. The Type Of Surface Treatment Adopted Greatly Affects The Shear Bond Strength Of Pressed And Repressed Ceramics And Hence The Durability Of Resin Cement Bonded To Ceramics. Sandblasting Cannot Be Considered As A Reliable Surface Treatment When Bonding To Pressed And Repressed Glass Ceramic.

Taha Amer Taha, Ahmed Mohamed Fahmy And Doaa Amr Heshmat,

Objectives: This Study Was Aiming To Evaluate Primary Stability Of Implant In Closed Sinus Lifting Cases By Densah Bur In Comparison To Osteotome In Partially Edentulous Patients. The Evaluation Was Carried Out Through Ostell Device Day Of The Surgery, 2, 4, 8 Weeks Postoperative.

Materials and Methods: This Study Was Conducted On Ten Patients. The Patients Were Divided Into Two Equal Groups. Each Patient Was Received 1 Implant At The Edentulous Site Of Missing First Or Second Maxillary Molar. One Group Received Dental Implants Using Closed Sinus Lifting By Osteotome While The Other Group Received Dental Implants Using Closed Sinus Lifting By Densah Bur. After Implant Placement, Smart Peg Is Placed On Implant And Ostell Is Used To Record ISQ. Implant Stability Was Measured Intraoperative And At Week 2, 4, 6, And 8 For Both Groups. The Collected Results Were Tabulated And Statistically Analyzed.

Results: The Study Results Showed That There Was No Statistically Significant Difference Between (Osteotome) And (Densah Bur) Groups In ISQ Reading Except At Week 4 Where The Highest Mean Value Was Found In (Densah Bur) Group, While The Least Mean Value Was Found In (Osteotome) Group. Conclusion: Within The Limitation Of This Study, Densah Bur Can Be Applied For Closed Sinus Lifting In A Simple, Safe And Predictable Way With Reduced Morbidity Without Need To Hand Tapping Force.

Mina W. Yassa,? Amal Kaddah And Ahmed E. Fayyad,

ABSTRACT
This Study Was Conducted To Evaluate The Effect Of Cast Modifications On The Adaptation Of Maxillary Denture Base In Completely Edentulous Patients. Three Groups Of Maxillary Complete Dentures Were Fabricated. Each Group Contained 15 Dentures. The First Group Was The Control Group And Did Not Contain Any Modifications. The Second Group Was Modified By Scraping A Postdam Posterior To The Fovea Palatini. The Third Group Was Modified By Scraping A Postdam As Well As Creating A Vertical Box-shaped Depression With Pinhole. Sagittal And Coronal Cuts Were Made On All The Casts Using Specific Points. These Images Were Then Captured And Scanned Using Stereomicroscope (50X Magnification) And Then The Images Were Introduced To An Image Analysis Software For Accurate Gap Measurement. There Was A Statistical Significant Difference Between The Three Groups In Both Sagittal And Coronal Cuts In Favor Of The Modified Casts. The Dentures With Postdam Scraping And Vertical Box With Pinhole Showed Better Adaptation And Less Gap Distance When Compared To The Dentures With Postdam Scraping Only.

Safinaz H. Fahmy , Mai M. Akah And Mona Ismail Riad,

ABSTRACT

Objectives: The Study Aim Was To Evaluate The Retention Rate Of Hydroxyapatite Nanofiber Reinforced Flowable Composite Compared To Conventional Resin-based Flowable Composite During Management Of Initial Non Cavitated Pits And Fissures Carious Lesion In Adult Population Over A One-year Period. Methods: A Total Of 19 Volunteer Patients Ranging In Age From 18 To 28 Years, Diagnosed With At Least 2 Non-cavitated Pit-and-fissure Caries In The First And Second Molars Were Selected For This Randomized Split-mouth Design Trial. A Total Of 38 Sealants, Were Placed. The Teeth Were Sealed With NovaPro? Flow Hydroxyapatite Nanofiber Reinforced Flowable Composite In One Side, While Filtek? Z350 XT Flowable Conventional Resin-based Composite On The Contralateral. Each Restoration Was Independently Evaluated In Terms Of Retention Rate At 1, 6, And 12 Months. Data Were Analyzed Using Wilcoxon Signed-rank Test And Friedman?s Test At P < 0.05.

Results: NovaPro? Flow Hydroxyapatite Showed Complete Retention With 100% At 1, 6, Month Evaluation Periods, While Filtek? Z350 XT Retention Rates Were 100%, 78.9%, Respectively, For The Same Evaluation Periods. At The 12-month Recall, 2 (10.5%) Total Losses Were Observed In Subjects Treated With NovaPro? Flow And 2 Total Losses (15.8%) For Filtek? Z350 XT. No Statistical Significant Difference In The Retention Rate In Both Sealants During Different Follow-up Intervals (P>0.05)

Conclusions: The Retention Rate Of Both Hydroxyapatite Nanofibers Reinforced Flowable Resin Composite And The Conventional Nanofilled Flowable Resin Composite After One Year Of Follow Up Was Comparable. Clinical Relevance: The Clinical Survival Rate Of Both Tested Materials May Indicate Them As Effective Approaches For Preventing Carious Lesions In Permanent Teeth.

Aya Gamal Ashour Hassan , Rasha Raafat Hassan And Mohamed Riad Farid,

ABSTRACT


Aim: This Study Was Conducted To Evaluate The Reproducibility Of CAMBRA And Cariogram As Caries Risk Assessment Among Patient With Age Range Of (18-40) Years Old. Method: 47 Patients Where Included In The Study Which Were Evaluated First With The CAMBRA Chart, Then The Same Data Was Used For Cariogram. All Inputs Where Included Except For The Salivary Buffering Capacity. The Results Were Calculated According To Caries Risk Value (low / Moderate / High / Very High). All Assessment Was Conducted In The First Visit With No Follow Up. Reproducibility Between The Results Given By The Two Models Was Evaluated By Using Kappa Statistical Analysis.

Results: The Agreement Between The Two Models Was ?Fair? Of Value 0.325 (low), With P-value<0.01 Which Makes The Results Statistically Significant But Not Enough To Make The Result Clinically Significant. From This We Can Conclude That Both Caries Risk Assessment Can Give Almost The Same Result Concerning Risk Assessment Except In The Difference Between High And Very High-risk Patient.

Abdel Hameed M., Metwally A., Dewdar R. And Rekaby A,

ABSTRACT

Objectives: The Present Study Was Conducted To Compare Between The Polyamide Thermoplastic Resin And Polymethyl Methacrylate Resin With Respect To The Patient Satisfaction As A Primary Outcome And Candidal Adherence As A Secondary Outcome. Subjects And Methods: In This Randomized Clinical Trial, Forty-eight Completely Edentulous Patients Were Randomly Classified Into Two Groups Of Twenty-four Patients Each. Group (I)?had?received A Complete Denture Made From A Polyamide Thermoplastic Material Complete Denture. Group (II) Had Received Complete Denture Made From Polymethyl Methacrylate.?Patient Satisfaction Was Evaluated Using A Questionnaire And Candidal Count Was Evaluated By Collection Of Swabs Cultured On Sabouraud?s Agar Gel Plates.

Results: There Was No Significant Difference In Mean Satisfaction Between Group?I?and Group?II?at Insertion Or 1 Month Periods (p?>0.05), However, There Was A Significant Difference In Mean Satisfaction Between Group?I?and Group?II?in 3 Months And 6 Months Periods (p?< 0.05). The Previously Mentioned Results Revealed That There Was No Significant Difference In Mean CFU Between Group?I?and Group?II?at Insertion Or 1 Month Or 3 Months Period (p?>0.05) Except In 6 Months Period Where There Was A Significant Difference In Mean CFU Between Group?I?and Group?II? (p?< 0.05).

Conclusions: Within The Limitation Of This Study We Can Conclude That, - There Was A Gradual Increase In Patient Satisfaction With Complete Denture Over Time In Both Groups. - Completely Edentulous Patients May Be More Satisfied With The Dentures Made Of Polymethyl Methacrylate More Than The Polyamide Thermoplastic Dentures. - The Polyamide Dentures May Have Less Candida Count Adherence On Their Surface Than Polymethyl Methacrylarelate.