Moataz Meabed And Azza Ezz Elarab,

ABSTRACT


Introduction: The Treatment Of Totally Or Partially Edentulous Patients With Osseointegrated Implants Is An Increasing Part Of Daily Dental Practice. The Greater Aesthetic And Functional Demands Made By These Patients Have Created A Constant Pressure To Find A More Esthetic Implants Material. Zirconia Implants Display Features Of Osseointegration Similar To Those Of Titanium Implants
Objectives: To Compare And Evaluate Clinically And Radiographically The Use Of One Piece Customized Zirconia Implant With Surface Treatment Using Selective Infiltration Etching Technique And Titanium Implant In Aesthetic Zone

Materials and Methods: Sixteen Patients Were Selected For The Study, Divided Into Two Groups. Group I Received The Zirconia Implants And Group II Received Titanium Implants. Two Implants Failed In Group I And One Implant Failed In Group II.

Results: Sixteen Patients Were Selected For The Study, Divided Into Two Groups. Group I Received The Zirconia Implants And Group II Received Titanium Implants. Two Implants Failed In Group I And One Implant Failed In Group II. Conclusion: Within The Limitation Of This Study, The Use Of Custom-made One-piece Zirconia Dental Implant Resulted In The Same Level Of Esthetics In Comparison To Titanium Dental Implant

Amany Mohamed Bayoumi, Mai Mahmoud Yousry And Rasha Rafaat Hassan,

ABSTRACT
Objective: This Study Was Conducted To Evaluate The Surface Roughness Of Machinable Ceramic, Composite, And Hybrid Blocks Before And After Erosion And/or Abrasion Challenge.

Materials and Methods: A Total Of 90 Specimens Of Ceramic, Hybrid And Composite CAD/CAM Blocks Were Tested In The Study. They Were Divided Into 3 Main Groups Of 30 Specimens Each, Then Subdivided Into 3 Subgroups Of 10 Specimens Each According To Challenge. First, Erosion Challenge; Where Specimens Were Exposed To Pepsi-Cola ,Second, Abrasion Challenge; Where Half Of The Specimen Of This Subgroup Were Subjected To The Abrasion Using Powered Toothbrush With A Dentifrice, While The Other Half Was Subjected To Toothbrush Abrasion Without Toothpaste. And Third, Erosion/Abrasion Challenge Where The Specimens Were Subjected To An Erosive Followed By An Abrasive Challenge Either With Or Without An Abrasive Toothpaste. For Each Specimen, An Optical Profilometer Was Used To Record The Surface Roughness Before (baseline) And After The Erosive And/or Abrasive Challenge. Surface Roughness (Ra) Was Then Calculated And Statistically Analyzed Using Three-way ANOVA And Bonferroni?s Post-hoc Test.

Results: Regarding The Surface Roughness Results, With Different Challenges Either Before Or After Brushing, Without Or With Toothpaste; There Was No Statistically Significant Difference Between Mean (Ra) Of The Three Materials. Conclusion: The Surface Roughness Of CAM/CAM Blocks Was Not Influenced By Any Of The Tested Erosion And/or Abrasion Challenges.

Sara Alaa El-Din Mohammed Kamal, Shereen Adel Ameen And Zeinab Nabil Emam,

ABSTRACT
The Aim Of The Present Study Is To Evaluate The Marginal Accuracy And Fracture Resistance Of Milled Zirconia Restorations Using Two Finish Line Types, Two Veneering Techniques And Two Margin Designs.

Materials and Methods: Two Specially Constructed Metal Dies Were Machine Milled Representing Upper First Premolar Preparation To Receive All-ceramic Restoration. The First Die Had Deep Chamfer Finish Line; While The Second Die Had Shoulder Finish Line.A Total Number Of Forty Zirconia Copings Was Constructed. They Were Divided In Two Main Groups, 20 Samples Each (deep Chamfer And Shoulder Finish Lines) And Were Subdivided Into Two Equal Subgroups (10 Samples Each) (layering And Pressing Techniques) And Further Sub Divided Into Two Equal Sub Divisions (5 Samples Each) (zirconia Margin And E.max Margin). Zirconia Copings Were Constructed On Prefabricated Metal Dies Using The Zirkonzahn CAD/CAM System; Also CAD Wax Was Constructed For Press On Technique With The Same System.Either Layering Or Pressing Veneering Techniques Were Performed According To Manufactures Instructions.Marginal Accuracy And Fracture Resistance Were Used As Testing Methods.Scanning Electron Microscope Was Used To Detect The Mode Of Failure.

Results: Mann-Whitney U Test Was Used To Compare Between The Two Finish Line Types, Two Techniques As Well The Two Margin Types. It Was Found That No Difference When Using Either Finish Line Type, Veneering Technique Or Either Margin Designs On Marginal Accuracy Or Fracture Resistance Values. Conclusion: A More Conservative Finish Line Might Be Preferred With All Ceramic Restorations. The Pressing Veneering Technique Would Positively Influence The Longevity Of All Ceramic Restorations. When Fracture Resistance Is Considered, Zirconia Margin Would Yield To Outstanding Longevity Of All Ceramic Restorations.

Heba M. Refaat, Salah El Behery, Manal El Sheikh And Osama I. El Batawy,

ABSTRACT
Objective: To Evaluate The Clinical Effectiveness Of Mouthwash Containing Pomegranate Peel Extract And Chlorhexidine Mouthwash On Bleeding On Brushing And Counting Of Streptococcus Mutans Among A Group Of Children With Permanent Dentition.

Materials and Methods: A Randomized, Controlled, Clinical Trial Was Carried Out Comprising A Sample Of 60 Children Aged Twelve To Fifteen Years. The Sample Was Divided Into Two Groups: Group I: Administration Of 0.12% Chlorhexidine Mouthwash Twice A Day For 14 Days; And Group B, Administration Of Pomegranate Peel Extract Mouthwash . Sulcus Bleeding Index Was Used To Evaluate Gingival Inflammation On The Days 0 And 30 While Counting Of Streptococcus Mutans Was Evaluated On The Days 14 And 30.

Results: In The Control Group, The Findings Showed That Chlorhexidine Mouthwash Significantly Reduced The Mean Values Of SBI And Counting Of Oral Streptococci. In The Study Group, The Findings Also Showed That Pomegranate Peel Extract Mouthwash Significantly Reduced All The Variables. However, The Findings Showed That Chlorhexidine Mouthwash Significantly Reduced Counting Of Streptococcus Mutans Higher Than Pomegranate Peel Extract Mouthwash. Conclusion: Pomegranate Peel Extract Mouthwash Wa Not As Effective As Chlorhexidine Mouthwash In Reducing The Count Of Oral Streptococci But It Was Effective In Reducing Gingival Inflammation.

Mohammed Hamed , Cherif Adel Mohsen And Shams Waaz Amgad,

ABSTRACT

Objectives: The Aim Of This Study Is To Evaluate The Influence Of Chlorhexidine Application On Retentivity And Sealing Ability Of Fiber Post. Methods: A Total Of Forty(n=40) Extracted Root Teeth Will Be Selected For This Study, Decronaized And Endodontically Treated. Specimens (n=40) Were Divided Into 2 Groups According To The Type Of The Irrigant Used During Endodontic Treatment. Each Group Was Subdivided Into 2 Subgroups According To Luting Agent And Each Subgroup Was Further Divided Into Two Classes According To The Test Which It Was Subjected. Five Samples Of Each Subgroup Will Be Subjected To Sealing Ability Test By Using SEM For Measurement And The Other 5 Samples Of Each Subgroup Will Be Subjected To Retentivity Test By Using Universal Test Machine.

Results: Dual ?cured Luting Agent Showed High Retention And Adaptation When Compared To Self-adhesive Cement.

Mohammed G. Al-Kashlan, Nagwa A. Ghoname And Hamed M. Al-Sharkawy,

ABSTRACT

Objectives: The Aim Of This Study Was To Assess Dental Age In Children With ?-thalassemia Major.

Materials and Methods: The Study Sample Was Comprised Of Sixty Children; Thirty Children With ?-thalassemia Major (17 Boys & 13 Girls) Aged From Six To Twelve Years Old, They Are Regularly Attending The Outpatient Clinic Of Pediatric Department, Faculty Of Medicine, Tanta University. The Other Thirty Healthy Children Were Selected From Pedodontic Clinic, Faculty Of Dentistry, Tanta University As A Control Group Matching Their Gender And Age.

Results: The Thalassemic Patients Showed A Delay In Their Dental Development With An Average 1.10+0.88 Years. Conclusion: The Thalassemic Patients Showed A Delay In Their Dental Development And Pediatric Dentists Must Be Mindful Of The Effect Of Delay In Dental Development For Early Diagnosis And Treatment Timing.

Ahmed G. Abdelnabi, Shams W. Amged And Cherif A. Mohsen,

ABSTRACT
Objective The Purpose Of This Study Was To Assess Fracture Strength And Colour Change Of Different Constructed Thicknesses Of Two Different Materials Namely IPS E.max Press And IPS E.max CAD.

Materials and Methods: Thirty Sound Extracted Human Permanent Premolar Teeth (N =30, N = 15 Per Group) Were Occlusaly Sectioned To Expose Underlying Yellow Dentin And Create A Smooth Uniform Surface. Standardized Preparations Of Thirty Disc Of Lithium Disilicate HT A3 Were Studied; They Were Divided Into Two Groups (15 Samples For Each) According To The Process Of Fabrication Into IPS E.max CAD And IPS E.max Press. Each Group Was Subdivided Into Three Groups According To Thickness 0.5mm, 1mm And 1.5mm (5 Samples For Each). Each Sample Was Cemented To Its Represented Tooth Using Adhesive Resin Cement Universal (A2 Shade) And Preserved In Distilled Water For 3 Days. A Digital Spectrophotometer (vita Esayshade) Was Used And CIE LAB Parameters Were Measured And The Average Values Of The Color Differences (?E) Were Calculated. The Samples Then Subjected To Vertical Compression Load Until Failure Using A Universal Testing Machine. Data Were Collected, Tabulated And Statically Analyzed. One Way ANOVA Followed By Pair-wise Tukey?s Post-hoc Tests Were Performed To Detect Significance Between Groups. Student T-test Was Done Between Subgroups. Result: The Results Showed That IPS E.max Press Recorded Higher Color Change (3.436) Than IPS E.max CAD (2.751). Concerned Fracture Resistance Highest Mean Value Was Recorded For The IPS E.max CAD (850.6N) That Higher Than IPS E.max Press (687.133N). (p�0.05). For Both Groups Of Monolithic Lithium Disilicate Glass-ceramic Material With 1.5mm Thickness Recorded Higher Fracture Strength Than Those Monolithic Lithium Disilicate Glass-ceramic Material With 1mm And 0.5mm. Conclusion: IPS E.max CAD Advocated Lower Color Change Compared With IPS E.max Press. And Concerning Fracture Strength, The IPS E.max CAD Advocated Higher Fracture Strength Compared With IPS E.max Press.

Raghda Ashraf Hassan Fayez, Ahmed Nour-Eldin Ahmed Habiband Rasha Mohamed Abdelraouf,

ABSTRACT

Objectives: The Aim Of The Present Study Is To Evaluate The Effect Of An Experimental Bioactive Glass-based Nanopowder Formula (BG-based Formula) Compared To Casein Phosphopeptide-Amorphous Calcium Phosphate Fluoride (CPP-ACPF) On Remineralization Of Experimentally Induced White Spot Lesions (WSL) In Enamel. Methods: Twenty Seven Upper Human Permanent Central Incisors Were Collected, Polished And Randomly Distributed Into Three Groups (I, II And III). WSLs Were Induced In All Teeth. Each Group Was Daily Subjected To The Remineralizing Agents (14 Days); Group I (negative Control) Was Suspended In Artificial Saliva, Group II Was Treated With CPP-ACPF, While Group III Was Treated With The Slurry Of The Experimental BG-based Formula. The Microstructure And Minerals Content Of Enamel Were Examined For Each Group Using SEM And EDXA At The Baseline, After Formation Of The WSL, And After Remineralization.

Results: Group III (the Experimental BG-based Formula) Showed More Regular Deposition Of The Mineral Layer On The Surface. A Subsurface EDXA Profile Of A Sectioned Representative Tooth From Each Group Showed That The Experimental BG-based Formula Was Effective In Surface As Well As Subsurface Remineralization Of WSLs. Whereas, MI GC Tooth Paste Plus (CPP-ACPF) Showed Remineralization Of The Enamel Subsurface More Than The Enamel Surface. Significance: Both CPP-ACPF And The New Experimental BG-based Nanopowder Formula Were Both Effective In Remineralization Of Enamel WSLs, With Less Surface Remineralization In Case Of CPP-ACPF.

Dalia M. Ghalwash, Khaled A. El Gaaly And Amani M. Zaki Abozeid,

ABSTRACT
Bisphosphonates (BPPs) Is A Drug Used In Treatment Of Many Pathological Conditions In Different Doses, Which Could Have Diverse Effects On Implant Success In Patients Receiving It. In This Study The Effect Of Oral Bisphosphonates On Successful Osseointegration Were Evaluated By Comparing The Effect Of High And Standard Doses Of BPPs On Bone Density Around Implants. Methodology: Implants Were Inserted In The Heads Of Femurs Of 25 Rabbits Were Divided Into 3 Groups. One Group Received Standard Dose Of BPPs, Another Group Received High Dose Of BPPs And A Control Group. Bone Density Was Evaluated Around Each Implant Using Radioactive Dating And CBCT. At The End, All Results Were Compared Together And Statistically Analyzed.

Results: BPPs Affected Bone Quality Close To And Far From The Implant Differently According To The Dose. Higher Doses Of BPPs Were Associated With Better Contact Osseointegration, While Standard Doses Were Associated With Better Distant Oasseointegration. Conclusion: Standard Doses Of BPPs Therefore Have Better Effect On The Quality Of Bone Surrounding Implants. So, Together With Obviously Having Less Side Effects, The Standard Doses Of Oral BPPs Could Be Considered Superior To High Doses In Achieving Our Optimum Goals Of Successful Osseointegration With Minimum Undesirable Side Effects.

Noura. Mokhtar ; Samir. Zidan And Ashraf. Taher,

ABSTRACT
Statement Of The Problem: When Dental Ceramic Materials Are Exposed To The Oral Environment, They May Undergo Physicochemical Alterations. The Incidence Of Repeated Forces During Chewing Results In Stress Concentration, And Thermal Variations Induce Fatigue Of The Materials. Thus, Restorations Are Prone To Catastrophic Failure When Subjected To Stress. Efforts To Enhance The Service Life Of All-ceramic Materials Have Been Undertaken To Improve Their Strength (s) And Fracture Toughness (KIC).

Purpose: The Aim Of This Study Was To Evaluate The Fracture Toughness And Hardness Of Vita Suprinity CAD/ CAM With And Without Cyclic Loading And Thermocycling.

Materials and Methods: A Total Of 24 Vita Suprinity Plates Of 3mm Thickness Were Cut By An Isomet Cutting Machine. All The Specimens Were Sintered And Then Auto-glazed According To Manufacturer?s Instructions. All Specimens Were Stored In Distilled Water At 37oC For 24 Hours In Sealed Containers In Incubator. Half Of The Specimens Were Exposed To Thermal Cycling With Number Of Cycles Was 500 Cycle , Dwell Times Were 25 S. In Each Water Bath With A Lag Time 10 S. And The Low-temperature Point Was 5 0C). The High Temperature Point Was 55 0C,and Also Were Exposed To Cyclic Loading In Chewing Simulator Machine In Which Twelve Specimens Of Experimental Ceramic Group Were Exposed To The Mouth-motion Fatigue At Load Of 50 N For 20,000 Cycles With A Frequency Of 1.6 Hz. The Other Half Was Left Without Any Aging Procedures. Surface Hardness And Fracture Toughness Were Measured Before And After Storage Where The Surface Hardness Was Measured Through Vicker?s Indentation By Using This Equation. HV=1.854 P/d2. Fracture Toughness Was Calculated By The Indentation Method Through This Equation. KIC = 0.016(E/H) 0.5 (P/c1.5).

Results: It Was Found That: Aging Procedure Affected On Vickers Hardness Mean Value Significantly. It Was Found That The Highest Mean Value Of Hardness Recorded At Baseline Then After Water Storage While The Lowest Mean � SD Value Of Hardness Recorded After Thermo-mechanical Aging. The Difference Was Statistically Significant. It Was Found That Aging Procedure Affected On Fracture Toughness Mean Value Non-significantly. It Is Found That The Highest Mean Value Of Fracture Toughness Recorded At Baseline Then After Thermo-mechanical Aging While The Lowest Mean � SD Value Of Fracture Toughness Recorded After Water Storage. The Difference Was Statistically Significant.

Conclusions: From The Findings Of Our Study, Ageing Procedure With Thermocycling And Cyclic Loading Negatively Affected The Surface Hardness And Cause Non-significant Increase In The Fracture Toughness Of Vita Suprinity.