Hadier Mahmoud, Mona Ismail Riad And Mai Mamdouh,

ABSTRACT


Aim: To Assess The Nanoleakage Of Ormocer-based Composite Resin Using Ormocer-based Etch And Rinse Adhesive Versus Conventional One. Environmental Scanning Electron Microscope (ESEM) And Image Analysis By Software Were Used To Evaluate The Tooth Restoration Interface.

Materials and Methods: A Total 66 Premolars Were Divided Into Two Main Groups According To Type Of Adhesive System Used Either Ormocer-based Adhesive System Or Conventional One, Each Group Was Further Divided Into Three Subgroups According To Storage Time Either 24 Hours, One Month Or Three Months.1mm Thick Beams Were Prepared And Immersed In The Tracer Solution. The Resin-dentin Interfaces Were Analyzed By An Environmental Scanning Electron Microscope (ESEM).

Results: A Non-significant Difference In The Nanoleakage Between Ormocer-based Adhesive And Conventional One For The 24 Hours And Three Months Storage Time. However, Significant Difference Between Ormocer-based Adhesive And Conventional One For One Month Storage Time Where Ormocer-based Adhesive Showed Less Nanoleakage. Conclusion: Tested Adhesives Showed Good Sealing Ability After Aging For Three Months; However, Ormocer Containing Adhesive Performed Better Than That None Containing Over Time With Less Linear Gaps And Silver Impregnation.

Zeiad H. Seif-Alnasr , Yousreya A. Shalaby And Naguib El-Fawal,

ABSTRACT
Background: There Has Been Increasing Interest In The Use Of Porcelain Laminate Veneers As Esthetic Restorations Because These Combine High Aesthetic Appeal, Patient Satisfaction, And Less Invasive Tooth Preparation. However, It Should Be Noted That Minimal Tooth Preparation Means That The Thickness Of The Veneers Is Reduced, Which Leads To Increase In Translucency Leading To An Aesthetic Problem Unless The Factors Related To The Cementing Technique Are Precisely Controlled. Objective: The Aim Of This Study Was To Evaluate The Effect Of Substrate Color, Veneer Thickness And Shade Of Resin Cement On Final Shade Of Ceramic Veneers Using Digital Image Shade Matching Software.

Materials and Methods: A Metal Mold (8?8?4) Mm Was Constructed And Filled With Composite Resin Material. 60 Specimens Were Prepared 30 Specimens A2 Shade And 30 Specimens A3.5 Shade Simulating Teeth Shades. Serial Thin Slices Ceramic Specimens Were Obtained From Multilayered Glass-ceramic Blocks (IPS Empress CAD Multi C14 A1) Using A Low-speed Precision Cutter Under Water Cooling: 30 Ceramic Specimens Of (8?8?0.55 Mm); And 30 Ceramic Specimens Of (8?8?0.8 Mm). One Surface Of Each Ceramic Specimen Was Etched Using 5% Hydrofluoric Acid IPS Ceramic Etching Gel For 20 Seconds, Rinsing And Air Drying + Application Of Silane Monobond-S For 60 Seconds, And Air Drying. Opaque, White And Transparent Resin Cement Multilink? Were Used For Cementation Under Static Load 2.5kg. Shade Analysis Was Done Using Shade Wave Software And Adobe Photoshop C6 Before And After Luting Of The Veneers With Resin Cement.

Results: The Substrate Influenced The Final Color Of The Veneers Without Significant Difference Between Substrate A2 And A3.5. Increasing The Thickness From 0.5mm To 0.8mm Significantly Reduced The Value Of Delta E. Opaque Cement Resulted In Higher Delta E Than White And Transparent Cement With Significant Difference Between The Three Cements Only While Using 0.5mm Veneer Thickness.

Conclusions: It Was Concluded That Substrate, Ceramic Thickness And Shade Of Resin Cement Together Play A Detrimental Role In Changing The Final Color Of Laminate Veneers And Should Be Considered Carefully To Obtain Optimum Results.

Samar A. Mosaad, Suzan A.W. Amin And Heba A. Alasfory ,

ABSTRACT
Objective: This Randomized, Clinical Trial Compared The Postoperative Pain After The Use Of Manual And Rotary Instrumentation Of The Same Instrument Design, Namely ProTaper Universal System (Dentsply Maillefer,Tulsa Dental, TN, USA) In Mandibular Posterior Teeth After Single-visit Root Canal Treatment. Participants And Methods: Forty-six Participants With Mandibular Posterior Teeth Without Periapical Pathosis Were Included. The Patients Were Equally Allocated At Random Into Two Groups According To Instrumentation Technique Using Either Manual ProTaper Instruments (Group M) Or Rotary ProTaper Instruments (Group R). Root Canal Treatment For All Participants Was Done In A Single-visit. Pain Intensity Was Assessed Using The Numerical Rating Scale (NRS) 6 Hours, 12 Hours, 24 Hours, 48 Hours, 72 Hours And 7 Days Postoperatively. Pain Incidence At Four Categories (None, Mild, Moderate Or Severe) Was, Also, Recorded. Data Were Statistically Analyzed And P-values< 0.05 Were Considered Statistically Significant.

Results: There Were Significantly More Patients Experiencing No Pain In Group R Than Group M At 12 And 24 Hours (p< 0.05). No Significant Difference In The Distribution Of Patients At The Different Pain Categories Was Detected For The Other Time Points (p>0.005). Patients In Group R Showed Significantly Less Pain Levels Than Those In Group M At 6, 12 And 24h Postoperatively (p< 0.05). Conclusion: Rotary Instrumentation Can Elicit Less Postoperative Pain Than Manual Instrumentation In Patients With Mandibular Posterior Teeth Endodontically Treated In A One Visit.

Heidar O. Shahin, Samir I. Bakry, Amir Azer And Mona M. Abd El-Latif,

ABSTRACT
Objective: The Aim Of This Randomized Controlled Clinical Trial Was To Evaluate 4-unit Posterior Full Contour Zirconia Fixed Partial Dentures (FPDs) Sintered In Microwave And Conventional Furnaces With Respect To Clinical Performance And Survival Of The FPDs.

Materials and Methods: Twenty Patients In Need Of One Posterior Four-unit FPD Replacing Mandibular Second Premolar And First Molar Were Included. Twenty FPDs Were Milled Using CAD/CAM System And Randomly Assigned Into One Of The Two Groups (n=10) According To The Sintering Technique (Group 1: Microwave Sintering And Group 2: Conventional Sintering). For The Clinical Evaluation At Baseline, 6 And 12 Months, USPHS Criteria Were Used.

Results: Twenty Patients Were Examined. At The 1-year Follow-up The Survival Rate Was 100% In Both Groups.

Conclusions: Monolithic Zirconia Can Be Used For The Construction Of Full Contour FPDs. Both Microwave And Conventional Sintering Of Zirconia FPDs Exhibited Good Clinical Outcomes Without Differences Between Groups. Microwave Assisted Furnace Can Be Used As A Valuable Alternative For Conventional Furnaces For The Sintering Of Monolithic Zirconia Restorations Without Hindering Zirconia Properties.

Eman Gamal Sobh, Salah Hasab Mahmoud, Michael Francis Burrow And Hamdi Hosni Hamama,

ABSTRACT
Glass-ionomer Dental Cements (GICs) Are Widely Used In Dental Clinics. They Are Aqueous Cements Formed By The Reaction Of An Acidic Polymer And A Basic Glass In The Presence Of Water. Glass-ionomer Cements Have Properties That Are Clinically Useful And Promote Longevity. Their Ability To Chemically Bond To Tooth Structure And Anti-cariogenic Effect Made Them Unique. Despite All These Advantages, GICs Have Some Drawbacks; Low Mechanical Properties, Moisture Sensitivity. GIC Limitations Has Led Researchers To Develop Many Modifications To Overcome Its Drawbacks. Many Changes And Modifications To The Basic Glasses And The Chemistry Of The Acidic Polymers Have Been Made. In This Review, All Modifications Of Glass Ionomer Will Be Discussed.

Mahmoud Usama El-Masry, Omniya Abdelaziz And Ragia Mounir,

ABSTRACT
Mineralized Plasmatic Matrix That Is Also Termed Sticky Bone Graft Is A Bone Graft Material With Structural Stability Rich With Growth Factors That Enhances Bone Regeneration Process, Technique Of Preparation Is Easy, Cost Effective, Maintains Grafted Bone Volume During The Period Of Healing Of Guided Bone Regeneration Surgeries. The Goal Of The Present Study Was To Evaluate And Assess The Effectiveness Of Mineralized Plasmatic Matrix (MPM) Versus Autogenous Bone Graft In Horizontal Ridge Augmentation Of Upper Deficient Anterior Region Together With Implant Insertion. Methods:Nine Patients With Total 20 Implant Sites Who Fulfilled Specific Inclusion Criteria Were Assigned Into Two Groups. According To The Surgical Technique Used, In The Study Group Implants Were Placed In The Horizontal Bony Defect In The Maxillary Anterior Alveolar Ridge, The Exposed Threads Were Covered By MPM, In Control Group Threads Were Covered With Autogenous Bone Graft And Collagen Membrane.Facial Horizontal Bone Width (FHBW) Was Assessed Immediate Postoperatively And After 5 Months In Both Groups Using Cone Beam Computed Tomography.

Results: Bone Loss Was Recorded In Both Groups After 5 Months Healing Time In Both Groups , Facial Horizontal Bone Width Loss Was Less In Cases Of The Study Group (mean 1.4 Mm), Compared To (1.6 Mm) In Control Group That Was Found Statistically Significant, P Value (0.047).

Radwa Ibrahim El-Tahwi, Enas Fathelbab Abdelhalim And Shams Waaz Amgad,

ABSTRACT

Objectives: The Purpose Of This Study Was To Assess The Retention Strength Of Resin Nano Ceramics And Polyetheretherketone After Different Surface Treatments.

Materials & Methods: Forty Human Upper Central Teeth Were Prepared For Crowns And Divided Into Two Main Groups According To The Type Of Material Used; Twenty For Lava Ultimate And Twenty For Bio HPP. Each Group Was Further Divided Into Four Subgroups; 1) No Treatment, 2) Airborne-particle Abrasion With 50 ?m Alumina, 3) Airborne-particle Abrasion With110 ?m Alumina, And 4) 5% HF Acid Etching For 20 Sec. Thereafter, Crown Specimens Were Luted To Dentin Abutments Using Self-adhesive Resin Cement RelyX U200 And Stored In Water For 60 Days. All Specimens Were Thermocycled (5000 Cycles, 5?C To 55?C). Retention Strength Of Crowns Were Measured Using Pull-off Test In A Universal Testing Machine. Subsequently, Failure Types Were Determined Using SEM. Data Were Analyzed With 2-way And 1-way ANOVA Followed By Tukey?s Post Hoc Test.

Results: There Was No Significant Difference Between Retention Strength The Two Tested Materials. Air-abrasion With 50 ?m Alumina Recorded The Highest Mean Values For Maximum Pull Out Load (N) Followed By Air-abrasion With 110 ?m Alumina, HF Acid Etching, And Control Group, Respectively.

Conclusions: Airborne-particle Abrasion With 50 ?m Alumina Before Cementation Enhances Retention Strength Of Both RNC And PEEK Crowns. Adhesive Failure Mode At The Cement-dentin Interphase And Cohesive Within The Ceramic Material Denoted Adequate Bonding Between The Tested Materials And Luting Agent.

Shaimaa Sayed Ahmed, Enas Fathelbab Abdelhalim And Shams Waaz Amgad,

ABSTRACT

Objectives: The Study Evaluated Color Stability Of Two Machinable Restorative Materials, Resin Nano Ceramics (Lava Ultimate, 3M ESPE) And Poly Ether Ether Ketone Ceramics (Bio HPP, Bredent GmbH) After Immersion In Different Staining Solutions (coffee, Tea, Pepsi And Distilled Water As Control Group).

Materials and Methods: Forty Upper Central Teeth Were Prepared For Crowns And Divided Into Two Main Groups According To The Type Of Material Used; Twenty For Lava Ultimate And Twenty For Bio HPP. Each Group Was Subdivided Into Four Subgroups Five Specimens Each To Be Immersed In Three Different Staining Solutions; (coffee, Tea And Pepsi( And Distilled Water As Control Group, For Color Stability Test After A Month Using Spectrophotometer.

Results: A Statistical Insignificant Difference In Color Change Mean Values Was Found Between Lava Ultimate Group And Bio Hpp Group, Coffee Showed The Highest Mean Value Of Color Change Followed By Tea Then Pepsi. Conclusion: Resin Nano Ceramic Materials Are More Susceptible To Discoloration Than PEEK Ceramics. Coffee Has The Highest Ability To Stain Restorative Materials.

Kareem Abd El Hamid Lotfy, Heba Salah El Din Hamza And Dina Wafik Elkassas,

ABSTRACT
Objective: The Aim Of This In Vitro Study Was To Evaluate The Penetration Efficacy Of A Caries Infiltrant Resin With Different Etching And Application Times.

Materials and Methods: Ninety Sound Human Incisors Were Immersed In A Demineralizing Solution In Order To Create Artificial Subsurface Carious Lesions. Specimens Were Divided Into Three Equal Groups According To Etching Time [30, 60,90 Sec] Then Further Divided Into Three Subgroups According To Application Time [4, 3+1, 2+1 Min]. After Application Of The Infiltrate Resin, Specimens Were Embedded In Transparent Scaffolds And Sectioned. Specimens Were Immersed In A 100?Mj/sodium Fluorescein For 3 Hours. Digital Images Were Obtained Using Light Stereo Microscope At 120x. Results Were Analyzed Using ANOVA Test.

Results: Etching Time Had No Significant Effect On The Depth Of Penetration Of The Resin Infiltrant Material. However Significant Difference Between Different Application Times (P<0.0001) Was Evident. Using 30sec. Etching Time, The Highest Significant Mean Value Was Recorded In 4min Application Time, Whereas The Lowest Significant Mean Value Was Recorded In 2min Application Time. Conclusion: Application Time Is A Crucial Factor That Affects The Penetration Depth Of The Resin Infiltrant Material.

Asmaa Yousry Tawfiq, Hoda Abdel Kader Saleh And Salma Belal Eiid,

ABSTRACT


Purpose: To Investigate The Diagnostic Accuracy Of Ultra Low Dose-Cone Beam Computed Tomography Protocol In Detection Of External Root Resorption In Mandibular Teeth.

Materials and Methods: Twenty Extracted Human Mandibular Intact Roots Were Recruited In This In-vitro Diagnostic Study. Simulated Resorptive Defects Of Various Standardized Sizes (0.5mm-0.9mm-1mm) Were Drilled On Each Root Using Inverted Cone Burs With Different Sizes Mounted On Low Speed Hand-piece. Some Sites Were Left Intact On Each Root To Act As Control Sites. The Total Number Of Simulated Defects Was 180 Distributed Randomly On Different Root Surfaces, While A Total Of 60 Sites Were Left Intact. Prepared Roots Were Fitted Into Corresponding Sockets Of A Mandible To Be Scanned By Ultra Low Dose-Cone Beam Computed Tomography Protocol (90 Kvp, 5.6 MA, 4 Seconds) Using A 0.2 Mm Voxel Size And A Field Of View 4x5 Cm .

Results: Ultra Low Dose-Cone Beam Computed Tomography Protocol Had An Overall Sensitivity Of (71%), And Overall Specificity Of (96%). The Diagnostic Accuracy In This In Vitro Study Was (77%). The Positive Predictive Value Recorded Was (98%), While The Negative Predictive Value Was (52%). The Positive Likelihood Ratio Was (18) And The Negative Likelihood Ratio Was (0.3). Conclusion: Ultra Low Dose-Cone Beam Computed Tomography Protocol Could Be Used For Detection Of External Root Resorption With Comparable Diagnostic Accuracy To Standard Protocols But With Significantly Less Radiation Dose.