Mai S. Elgohary, Hesham Abd El Megid Katamish And Maha A. Taymour,

ABSTRACT
Statement Of The Problem: Long-term Clinical Success Of Dental Restoration Is Influenced Not Only By Mechanical Property, Aesthetic Quality, And Biocompatibility, But Also By Marginal Accuracy. Large Marginal Gap Causes Failure Of A Crown By Dissolving Dental Cement So Plaque Can Easily Accumulate, Leading To Marginal Leakage And Secondary Caries. Factors Such As Type Of Finish Line Design And Thickness May Influence The Marginal Adaptation Of All Ceramic Crown Restoration.

Purpose: The Purpose Of This Study Was To Evaluate And Compare Marginal Accuracy In Anterior Single Crowns Having Different Finish Line Thicknesses Constructed From Two Types Of All-ceramic Restorations Made From Lithium Disilicate Glass Ceramic And Anterior Zirconia Using CAD/CAM Fabrication Technique.

Materials and Methods: Thirty-two Zirconia-based Bruxzir Anterior (Glidwell Dental Labs, Prismatik DentalCraft Inc. USA) And Lithium Disilicate Crowns IPS E.max CAD (IvoclarVivadent Gmbh, Burs, Austria), 16 Each, Were Fabricated With CAD/CAM Systems On A Specially Designed Stainless-steel Die To Ensure The Standardization Of Specimen Shape And Dimensions. The Marginal Accuracy For All Tested Crowns Was Evaluated By Using A Stereomicroscope (Nikon Eclips E600, Tokyo, Japan) Connected With An IBM Compatible Personal Computer Using A Fixed Magnification Of 45X., A Digital Image Analysis System (Image J 1.43U, National Institute Of Health, USA) Was Used To Measure And Qualitatively Evaluate The Gap Width. Then The Data Obtained Were Collected, Tabulated And Then Subjected To Statistical Analysis.

Results: Results Of This Study Showed That Finish Line Thickness Regardless To The Material Used Did Not Significantly Affect The Marginal Accuracy. And The Material Has Influence On Marginal Accuracy. A Value Of P < 0.05 Was Considered Statistically Significant, Two -way Analysis Of Variance Was Performed. Student T-test Was Done For Compared Pairs. Sample Size (n=8) Was Large Enough To Detect Large Effect Sizes For Main Effects And Pair-wise Comparisons, With The Satisfactory Level Of Power Set At 80% And A 95% Confidence Level.

Conclusions: More Conservative Preparation Of A Shallow Chamfer Has Similar Marginal Fit As Teeth With The Conventional Preparation For Both Ceramic Types Tested.

Mohammed El-Desoki Fouda, Ahmed Atef El-souda And Amany E. Badr .,

ABSTRACT

Objectives: The Purpose Of This Study Was To Evaluate And Compare The Shaping Characteristic Of Different Rotary NiTi Systems (Hyflex EDM One File, Reciproc R25, Wave One Primary) In Extracted Human Teeth Using Cone Beam Computed Tomography Scanning (CBCT). Methods: Fourty Five Mesiobuccal Canals Of Mandibular Molars With Angle Of Curvatures Between 25-45 Degrees, Were Randomly Divided Into 3 Experimental Groups (n = 15), According To The NiTi Rotary System Used, Hyflex EDM, Reciproc R25 And WaveOne. All Canals Were Instrumented Using The Three Systems According To The Manufacture Instruction, Scanned Before And After Instrumentation By Using CBCT Scanner To Evaluate Canal Transportation And Centering Ratio At 3, 6 And 9 Mm From The Apex. Data Were Statistically Analyzed And The Significance Level Was Set At P< .05.

Results: At 3 Mm From The Apex, Hyflex EDM Showed The Lowest Significant Canal Transportation Value And The Highest Centring Ability Compared With Reciproc R25 And WaveOne Systems. No Significant Difference In The Amount Of Transportation And Centering Ability Between Reciproc R25 And WaveOne Systems. At The Level Of 6 Mm From The Apex, Hyflex EDM Showed The Lowest Significant Value Of Canal Transportation And Highest Centring Ability When Compared With Other Systems, And Reciproc R25 Showed Significantly Less Canal Transportation And More Centering Ability When Compared With WaveOne. At The Level Of 9 Mm From The Apex There Were No Significant Difference In The Amout Of Transportation And Centering Ability Between The Three Groups. Conclusion: Hyflex EDM System Showed The Least Canal Transportation And The Highest Centering Ability Followed By Reciproc R25 System While WaveOne System Produced The Highest Transportation And Lowest Centering Ability.

Nouran A Mohamed, Rehab F Fathi And Houry M Baghdadi,

ABSTRACT
Aims And
Objectives: This Study Aims To Analyse Immunohistochemically The Expression Of Sonic Hedgehog (Shh) In Oral Epithelial Dysplasia (OED) And Oral Squamous Cell Carcinoma (OSCC). Methods: Fifty Formalin-fixed, Paraffin-embedded Specimens Of OED And OSCC, Twenty Diagnosed As OED And Thirty Diagnosed As OSCC, Were Included In The Present Study. Immunohistochemical Staining With Anti-Shh Primary Antibody Was Performed. Area Fraction Of Immunopositivity Was Estimated By Image Analysis Software.

Results: The Study Showed That Shh Signaling Molecules Are Highly Expressed In OED And OSCC. Conclusion: Over-expression Of Shh Is Found In OED And OSCC And Might Be Used As A Reliable Diagnostic Marker For Both Cases.

Ahmed Mohammed Salah, Mohammed Ezzat Elsayed, Sayed Mohammed Elmasry And Moataz Mostafa Bahgat Elmahdy,

ABSTRACT
The Purpose Of This Study Was To Evaluate The Effect Of Metal And Acetal Removable Partial Denture (RPD) Framework Materials On The Stresses Around Implant Supported Removable Partial Dentures. Material And Methods : The Study Was Carried Out On Mandibular Epoxy Class I Partially Edentulous Models With Two Parallel Implants Placed At Lower First Molar Area And According To Framework Materials, Two Groups Were Created: Group I : Acetal Partial Denture Framework, Group II: Metallic Partial Denture Framework, For Both Groups Acrylic Record Block With Metal Plate Was Made And Adjusted To Apply Occlusal Force On The Center Of The Metal Plates, Regarding The Models From The Right And Left Side, Stress Analysis Images Were Recorded For Both Groups At Stresses From 20 To 100 Newton, Using Photoelastic Machine And Means Of Stress Values Were Recorded For Both Groups, Tabulated And Statistically Analyzed.

Results: There Was A Difference In Means Of Stress Values Between Acetal And Metallic Partial Denture Frameworks Where Metallic Partial Denture Framework Showed Higher Stress Fringes Order Around Implant Compared To Acetal Denture Base.

Conclusions: Within The Limitations Of This In-vitro Photoelastic Analysis, The Following Was Concluded : Acetal Partial Denture Frameworks Were Preferred To Use With Implant Supported Removable Partial Denture When Compared With Metal Partial Denture Frameworks, For Preservation Of Bone Around Implant, Acetal Denture Bases Is The Treatment Of Choice.

Mohammed Elsayed Saber, Mohammed Ezzat Elsayed, Sayed Mohammed Elmasry And Moataz Mostafa Bahgat Elmahdy,

ABSTRACT


Purpose: Purpose Of This Study Was To Photoelastic Stress Analysis Of Two Flexible Attachments Implant Supported Mandibular Overdentures With Different Implant Angulations (parallel Implants And Diverged Implants). Using Two Attachment Systems (locator And Sphero-flex)

Materials and Methods: Six Photo Elastic Epoxy Models Were Divided Into Two Groups. For First Group: While Duplication Of The Epoxy Models Two Implants Inserted Vertically (parallel To Each Other) For Second Group: While Duplication Of The Epoxy Models Two Implants Inserted Diverged Distally From Midline With 14 Degree Using Semicircular Protractor. After Epoxy Models Construction,the Locator Attachment Were Placed For The First Group Models While Spheroflex Attachment Were Placed For The Second Group Models. For Both Groups Models, Successive Loads (20,40,60,80,100) Newton Were Applied Using Photo Elastic Stress Analysis Machine By Using Metal Plate Fixed At The Lower First Molar Region Bilaterally Then Stresses Were Recorded And Analyzed. After The First Stage Of Loading, The Implant Attachments For Both Groups Were Interchanged Then The Second Stage Of Loading With Same Successive Loads (20,40,80,100) Were Applied Using The Same Protocol Of The First Stage. The Photo Elastic Stresses For The Two Loading Stages Were Recorded And Statistically Analyzed.

Results: No Statistic Significant Difference Between Two Groups Of Flexible Attachments (locator And Spheroflex) Was Observed When Successive Loads Were Applied On Parallel Implants While There Was Astatic Significant Difference (p� 5%) Between Two Groups When Successive Loads Were Applied On Angulated (diverged) Implants . Conclusion: On Choosing The Flexible Attachment Comparing Locator And Sphero-flex In Case Of Parallel And Diverged Implants Assisted Over Dentures, The Locator Attachment Is More Preferred Regarding Peri Implant Stress Outcome.

Nour Shazli And Mohammed Nadershah,

ABSTRACT
This Review Analyzes The Increase In Feminization In The Field Of Dentistry, As Well As The Implications Feminization Has On What Was Once Considered A Male-dominated Profession. It Also Evaluates The Factors Gender Roles Played Throughout. Through A Review Of Relevant Literature Pertaining To The Matter It Has Been Found That Significant Factors Within The Work Environment Influence The Progress Of Female Dentists, Alongside Issues Of Perception From Patients. These Effects Are More Pronounced Across Cultures Depending On Social Hierarchy; Cultural Dimensions Closely Correlate To Working Conditions And Dependent Variables Such As Pay Equality, Progression Opportunities And Socialization In The Workplace.

Omar Elmahdi, Maged Elhakim And Lomaya Ghanem,

ABSTRACT
Statement Of The Problem: Many Studies Had Mentioned The Best Cementation Procedure And Surface Treatment Done To Lithium Disilicate E Max Crowns, However None Has Tackled The Cementation Of E Max With The New Bioactive Cement And Testing The Specimens Fracture Resistance. Aim Of The Study: Is To Evaluate The Effect Of Bio-active Cement On The Fracture Resistance Of E Max Crowns. Methodology: Teflon Bars Were Collected. Fifteen Teflon Molar Blocks Will Be Created From Teflon Bars, Five Blocks Will Be Unprepared And Ten Blocks Were Prepared To Receive Emax Crown. The Created Blocks Were Divided Into Three Groups (n=5). Group 1 (control Unprepared), And According To Cement Used Group 2 (conventional Glass Ionomer Cement) And Group 3 (bio-active Cement). Fracture Resistance Of All Samples Was Done Using Universal Testing Machine. One-way ANOVA Test Was Used To Compare Between The Three Groups. Bonferroni?s Post-hoc Test Was Used For Pair-wise Comparisons When ANOVA Test Is Significant. The Significance Level Was Set At P� 0.05. Statistical Analysis Was Performed With IBM? SPSS? Statistics Version 20 For Windows.

Results: There Was No Statistically Significant Difference Between Bio Active Cement Group And Glass Ionomer Cement Group. Conclusion: There Is No Influence Of The Cement Type Either Conventional Glass Ionomer Or Bio Active On The Fracture Resistance Of Posterior E Max Crowns.

Hussein Abdel Hady Hussein, Amr Mohamed Ismail Badr, Emad Mohamed Tolba Mahmoud Agamy And Gehan Fekry Mohamed,

ABSTRACT


Purpose: The Aim Of This Study Was To Investigate The Stability Of Three Implants Supported By A Milled Bar, Which Carry Two Different Attachment Systems And Submitted To Immediate Loading. Methodology: The Current Research Was A Prospective Study Conducted According To Split-mouth Design With Random Allocation Of The Tested Attachments. Two Types Of Attachments Were Used, OT Equator And OT Cap Attachment. A Total Of 8 Completely Edentulous Patients Were Divided Into 2 Groups According To OT Equator Position. CBCT Was Used For The Planning And Construction Of The Surgical Stent. A Milled Bar With The Attachments Was Fabricated Prior To Implant Placement. Each Patient Received Three Implants In The Interforaminal Region, Connected With A Milled Bar. On One Side Of The Bar; OT Equator Attachment Was Used, While The Other Side Was Supplied With OT Cap Attachment. Overdenture Was Delivered At An Average Time Of 10 To 15 Days After Implantation. Follow- Up Period Was 12-months After Loading. Implant Stability Was Evaluated Using Osstel TM.

Results: The Results Revealed That; There Were No Significant Differences Between All Groups At Implant Placement Time And At 12-months Period For All Implants And Through Different Time Intervals Until The Follow-up Period Was Finished. Conclusion: The Results Of The Current Study Indicated An Increase In Implant Stability And Due To Splinting Of The Implants By Using Immediate Loading Protocol. Splinting Of The Implants Using A Rigid Bar Appears To Be A Successful Treatment Option That Could Be Considered For Treating The Completely Edentulous Patient.

Amani Attia , Ahmed Ghobashy And Salma El-Ashry,

ABSTRACT
Objective Compare The Effectiveness Of D-Race And Hyflex EDM Files On Removal Of Gutta-percha Sealed With Either Resin-based Or Bio-ceramic Sealer, And To Evaluate The Amount Of Apical Extruded Debris. Methods Forty Eight Extracted Type I Single Rooted Teeth Were Instrumented Using Protaper System. Teeth Were Randomly Divided Into Two Groups (n = 24) According To The Type Of Sealer Into Group I: Bioceramic Sealer And Group II: Resin Based Sealer. After Obturation, Each Group Was Further Divided Into Two Subgroups According To The Type Of System Used In Retreatment (n = 12); Subgroup A: D-Race Retreatment System And Subgroup B: Hyflex EDM Rotary System. Eppendorf Tubes Were Used For Collection Of The Debris Extruded Apically. Each Third Of The Root Canal Was Examined Using Stereomicroscope. Results No Significant Difference Was Found When The Root Canal Was Considered In Its Entirety. Significant Difference Was Found Between Group IA And IIA In The Middle And Cervical Third Of Root Canals. Significant Difference Was Found Between Group IB And IIB In Apical And Cervical Third Of The Root Canal. Conclusion Complete Removal Of Filling Materials Could Not Be Achieved In This Study. Hyflex EDM System Was Effective In Removal Of Filling Materials.

Wedad Ismail Gaber Eltaher, Marwa Magdy Saad Abbass And DaliaAbdElhamid El Baz,

ABSTRACT
Background. Obesity Is A Worldwide Medical Problem, Which Is An Abnormal Or Extensive Fat Accumulation. Nowadays, There Are Many Types Of Nonprescribed Dietary Supplements That Are Used For Weight Loss As Green Coffee Bean Extract And Agiolax. As A Result Of Their Effect On Fluid Excretion, Both Of These Products May Be Expected To Have A Damaging Effect On Parotid Salivary Gland. Objectives. The Present Work Aims To Compare Between The Effect Of Using Green Coffee Bean Extract And Agiolax On The Integrity Of Parotid Salivary Glands Of Albino Rats. Material And Methods. Twenty-seven Adult Male Albino Rats Were Randomly Assigned To 3 Groups. Nine Received Distilled Water Daily For 2 Months By Oral Gavage (the Control Group); The Other 2 Groups Received 1 Mg/100 Gm.body Weight Green Coffee Bean Extract Or Agiolax 8 Mg/100 Gm.body Weight Daily For 2 Months By Oral Gavage (the GC And Ag Groups, Respectively). The Parotid Glands Were Dissected And Examined Histologically, Histomorphometrically, Biochemically, Immunohistochemically For Caspase-3 And By Real Time PCR. Results.The Immunoreaction Of Caspase-3 Was Significantly Increase In Agiolax Group And Green Coffe Bean Extract. Biochemically, The Value Of Calcium In Serum Was The Lowest In Agiolax Group. However, The Highest Mean Value Of Calcium In Urine Was Recorded In Agiolax Group As Compared To The Other Two Groups. In Addition, The Calcium Level In Tissue Was Decrease In Green Coffee Group And Agiolax. PCR For Calbindin-2 Recorded The Lowest Value In Green Coffee Bean Extract Group. Conclusions. Long-term Oral Administration Of Green Coffee Bean Extract And Agiolax Might Lead To Degenerative Changes In The Parotid Glands. A Greater Deleterious Effect Was Caused By Agiolax, As It Caused More Caspase-3 Expression, Significantly Reduced Ca Level In The Tissue And In Serum. In Addition, Calbindin-2 Recorded The Lowest Value In Green Coffee Bean Extract Group.