Ebrahim Ali Ahmed Ismail Alsharafi And Khaled Ibrahim Abd El-Aziz Barakat,

ABSTRACT


Purpose: The Objective Of This Study Was To Compare The Clinical And Radiographic Assessment When Right / Left Mandibular Angle Fractures Treated With Two Miniplates Via Transbuccal System. It Does Not Affect The Time Used, Cost, And Bone Density Between The Two Sides. Patient And Methods: The Current Study Was Conducted On Twelve Patients Diagnosed And Treated At The Out Patient Clinic And General Anesthesia Theatre Unite Of Oral And Maxillofacial Surgery Department, Faculty Of Dentistry, Minia University Dental Hospital (MUDH). Eight Of Them Were Males While Four Of Them Were Females With The Age Ranged From (16 - 50) Years. All Patients Suffered From Bilateral Mandibular Angle Fracture. Six Patients Were Treated Via Open Reduction And Internal Fixation In The First Group (right Angular Fracture) Group A, And Group B (left Angular Fracture) Using Two Miniplates.

Results: The Results Concluded That There Were No Significant Differences In Postoperative And Radiographic Assessment Between The Two Groups. Conclusion: We Concluded That Both Right And Left Mandibular Angle That Treated With Two Miniplates Technique Were Equally Effective. Although There Is A Common Idea That The Right Side Of The Mandible Is Preferable To The Left Side Of Many Surgeons, Which Can Produce Better Results.

Ahmed Salah Abbas, Yasser Fathi Hussein And Mohammed Mustafa Zayed,

ABSTRACT
Aim Of The Study: This Study Was Carried Out To Investigate The Effect Of Thermocycling On Shear Bond Strength Of Conventional Highly Viscous Glass Ionomer (CHVGI), Ceramic Reinforced Glass Ionomer (CRGI) And Glass Ionomer With Hybrid Technology (GIHT) To Nano-hybrid Composite (NHCR) And Nanofilled Resin-based Composite (NRC).

Materials and Methods: A Total Of One Hundred And Twenty Human Maxillary First And Second Premolars Were Invested In Acrylic Resin Blocks. The Proximal Surfaces Were Grinded Parallel To The Long Axis Of The Tooth To Obtain A Flat Surface. Then A Cavity Of 4 Mm Diameter And 2 Mm Depth Was Prepared To Retain The Liner. The Samples Are Divided Into Six Groups (A-F). Groups (A-C), Glass Ionomer Restoration Was Bonded To Nano-hybrid Composite Resin And Groups (D-F), Glass Ionomer Restorations Were Bonded To Nano-filled Composite Resin, Half Pf Samples In Each Group Were Subjected To Thermocycling At 1000 Cycles.

Results: Based On The Effect Of Thermocycling: The Shear Bond Strength Between (CHVGI) And (NHCR) (2.41�0.49 Mpa: Megapascal) Is Higher Than The Shear Bond Strength Between (CHVGI) And (NRC) (2.01�0.60Mpa). The Shear Bond Strength Between (CRGI) With (NHCR) (2.00�0.83Mpa) Is Less Than The Shear Bond Strength Between (CRGI) And (NCR) (5.71�0.61Mpa). The Shear Bond Strength Between (GIHT) And (NHCR) (2.31�1.12Mpa) Is Less Than The Shear Bond Strength Between (GIHT) And (NCR) (3.51�1.24 Mpa). Conclusion: Thermocycling Has A Negative Significant Statistical Effect On Shear Bond Strength Between High Viscous Glass Ionomer And Nanohybrid Composite Resin, High Viscous Glass Ionomer And Nanofilled Composite Resin, Ceramic Reinforced Glass Ionomer And Nanofilled Composite Resin, Glass Ionomer With Hybrid Technology With Nanohybrid Composite Resin. Thermocycling Has No Significant Statistical Effect On Shear Bond Strength Between Ceramic Reinforced Glass Ionomer And Nanohybrid Composite Resin, Glass Ionomer With Hybrid Technology And Nanofilled Composite Resin.

Ramy Salah Sadeek, Khalid Mohamed Noaman And Yasser Abdel Aziz Abed,

ABSTRACT

Objectives: To Investigate The Degree Of Mineral Penetration And Number Of Occluded Dentinal Tubules Under The Following Variables, Two Remineralizing Agents, Effect Of Smear Layer And Surface Treatment With Nd: YAG Laser Irradiation At 24 H And 3 Months.

Materials and Methods: Eighty Sound Human Maxillary Premolers Were Randomly Assigned Into Two Equal Groups, N=40, According To The Type Of Remineralizing Agent ( Novamin And CAsien ), Smear Layer Were Created On Half Of The Samples, N=20, Followed By Application Of Nd: YAG Laser On Ten Samples. Occlusive Percentage And Degree Of Mineral Penetration Were Measured By Scanning Electron Microscope ? Energy Dispersive X-ray Spectrometry At Baseline And After 3 Months.

Results: Novamin Containing Groups Showed Higher Statistically Significant Increase In Occlusion Percentage Of Dentinal Tubules Than Casein Phosphopeptides, On The Other Hand They Showed No Significant Difference In The Percentage Of Mineral Penetration. Also, All Groups That Had Smear Layer And Groups That Had Laser Application Showed Significant Higher Occlusion Percentage Than Their Counterpart With No Significant Difference In The Percentage Of Mineral Penetration. Occlusion Percentage Was Significantly Higher At 24 Hours Storage While Percentage Of Mineral Penetration Was Significantly Higher At 3 Months Storage Time. Conclusion. The Application Of Novamin And Casein Were Effective In Dentinal Tubules Occlusion Percentage And Increase Degree Of Mineral Penetration Together With Laser Application And Presence Of Smear Layer.

Asmaa Mahmoud Abdeen, Tarik Essawy And Saher Sayed Mohammed,

ABSTRACT
Background: Sofosbuvir (SOF) Was Published In 2013 As A Part Of First-line Treatment For Hepatitis C Virus (HCV) By The�American Association For The Study Of Liver Diseases . SOF Was Recommended For All Genotypes With A Cure Rate Greater Than 90%. Objective: Investigating Sofosbuvir-induced Alterations In The Rat Submandibular Salivary Gland (SMSG) Histologically And Immunohistochemically. Methodology: 80 Adult Rats Weighing About �150 Gm Were Divided Into 2 Groups, Group I (control Group) And Group II (experimental Group) Divided In To 3 Subgroups And Received SOF 40 Mg/kg/day For 1, 2 And 3 Months. All Animals Were Sacrificed, SMSG Were Dissected And Specimens Were Examined Histologically And Immunohistochemically.

Results: Compared To Group I, Group II Subgroup (1) And (2) Showed Acinar And Ductal Vacuolization, Oedema, Discontinuity Of The Epithelial Lining With Retained Coagulum In The Granular Convoluted Tubules (GCTs). These Changes Were Found To Be Exaggerated In Subgroup (3) Accompanied By Acinar And Ductal Shrinkage And Loss Of Gland Compactness. A Statistically Highly Significant Decrease In PCNA Immunoreaction Was Noticed In Experimental Group From Subgroup (1) To Subgroup (3). Conclusion: SOF Had Affected The Structure And Function Of SMSG Through Increased Reactive Oxygen Species (ROS) Levels Leading To Degenerative Changes.

Dalia Mostafa El Naggar, Ahmed Mohamed Alam-Eldein, Maha Mostafa Halim And Hoda Mohammed Amin Rashad,

ABSTRACT


Purpose: The Purpose Of This Study Was To Detect The Effect Of Accelerating Aging On Wear Of Clips In A Bar Retained Maxillary Implant Overdenture.

Materials and Methods: Four Implants Were Placed In A Maxillary Edentulous Epoxy Model With Two Bar Attachments And A Two Clip Overdenture.Initial Photos And Roughness Of The Clips Were Measured Before Applying Insertion Removal Cycles. After 540 Cycles (6 Month) And 1080 Cycles (1 Year) Of Insertion Removal On A Chewing Simulator, The Clips Were Observed Under The Microscope Using Scanning Electron Microscope And Surface Roughness Was Measured.

Results: Minor Cracks, Surface Irregularities And Some Roughness Were Seen In Scanning Electron Microscope Of Clips After 540 Cycles While Numerous Horizontal Vertical And Oblique Scratches With Greater Roughness Were Detected After 1080 Cycles.

Conclusions:. Scanning Electron Microscope Of The Clips Revealed Surface Changes And Roughness After 540 And 1080 Insertion Removal Cycles.

Alaa M. Akmal, Yousreya A. Shalaby And Amir S. Azer,

ABSTRACT
Background: The Accuracy Of The Marginal Adaptation Of A Crown Margin To The Abutment Is A Trigger That Influences The Survival And Efficiency Of Fixed Prosthodontics. Inaccurate Marginal Adaptation Is Potentially Detrimental To The Tooth And The Supporting Periodontal Structures. These Days Improved Vision Is Essential In All Dental Fields Enhancing Precision And Perfection.
Objectives: To Evaluate The Effect Of Two Different Magnification Approaches On The Marginal Fit Of CAD/CAM Monolithic Lithium Disilicate Glass Ceramic Crowns.

Materials and Methods: In-vitro Study Using 24 Upper Right Cuspid Typodont Teeth; Divided Into Three Groups According To Tooth Preparation Approach (n=8). Group I (control Group) Teeth Preparation Without Magnification (control Group), Group II Teeth Preparation Using The Dental Loupes With 3.5x Magnification And Group III Preparation Using The Dental Operating Microscope (DOM) Under Magnification Of 16x. Optical Impressions Were Taken Through Scanning By Sirona InEOS X5 Extra-oral Scanner Where Full Anatomical Crowns Were Structured, Processed, Sintered And Glazed. CBCT Was Utilized To Evaluate The Marginal Gapes Before And After Cementation/aging.

Results: Marginal Gaps Were Significantly Increased After Cementation And Aging In All Groups Yet Still Within The Acceptable Marginal Gap Range. Group III Showed The Least Marginal Gap Followed By Group II & Group I Respectively.

Conclusions: Magnification Devices Are Highly Recommended As A Major Assistant In The Daily Dental Work. Operating Microscopy OM Is A Significant Supplement To The Armamentarium Of Present-day Dentistry. It Helps Set The Bar Of Excellence And Flawlessness At The Highest Level Including All Dental Fields.

Mohammed Ali Mohammed,Yasser Fathi Hussein And Mohammed Mustafa Zayed,

ABSTRACT
Aim Of The Study: The Present Study Was Conducted To Compare The Microtensile Bond Strength Of All In One Adhesive Systems With Different Functional Monomers To Nano-filled Resin Based Composite And Bulk Fill Compsite.

Materials and Methods: A Total Of 40 Intact Human Molar Teeth Were Cleaned And The Occlusal Enamel Of The Teeth Was Removed. The Exposed Dentin Surfaces Were Polished And Rinsed, And The Different Adhesives Were Applied. A Bulk-fill Composite Resin And A Nano-filled Composite Resin Were Applied To Form Specimens Of 4 Mm Height And 6 Mm Diameter. The Specimens Were Sectioned Perpendicular To The Adhesive Interface To Produce Dentin?resin Composite Sticks, With An Adhesive Area Of Approximately 1 Mm2. The Sticks Were Subjected To Tensile Loading Until Failure Occurred.

Results: The Results Showed That The Microtensile Bond Strength Of The MDP Functional Monomer Containing Adhesive Was Higher Than That Of 3D-SR Functional Monomer Containing Adhesive Even When Using Different Types Of Composite Resins. Conclusion: It Was Concluded That, Regarding To The Microtensile Strength, The Different Functional Monomers Have A Direct Impact On The Adhesive Bonding Efficiency Either Due To Its Chemical Composition Or Due To Its PH Values, And That The 10-MDP Monomer Present In Clearfil Tri-s Bond Stands Out For Its Higher Bond Strength Values Even With Different Types Of Resin Composite.

Hasan N Abdulqadeer , Lamia E Dawood And Tawakol A Enab,

ABSTRACT
Aim Of Study: The Aim Of This Study Was To Evaluate The Effect Of Different Types Of Translucent Zirconia On The Fracture Resistance Of Posterior Laminate Veneers.

Materials and Methods: Thirty Maxillary First Premolar Teeth Were Fabricated With Ceramic Laminate Veneers And Divided Into 3 Groups According To Types Of Translucent Zirconia Used: Group T Specimens Receiving Tetragonal Zirconia Veneers Milled From Nacera Peral. Group C: Specimens Receiving Cubic Zirconia Veneers Milled From DDCubeX2. Group TC: Specimens Receiving Tetragonal/cubic Zirconia Veneers Milled From Zolid Fx. Load Of Fracture Was Tested By Using The Universal Testing Machine (UTM). Collected Data Were Statistically Analyzed Using One-way Analysis Of Variance ANOVA Followed By Tukey?s Multiple Comparison Test.

Results: The Result Of The Fracture Load Test Were Recorded In Newton: Group T: 317.45N; Group C: 313.03N; Group TC: 400.66N. Statistical Analysis Showed That The Result Of The TC Group Was Significantly Higher Than Those Of The Two Other Groups, While There Is No Significant Difference Between Groups T And C. Conclusion: The Change In Yttrium Content And Composition Resulted In Significant Effect On The Fracture Load Of Laminate Veneer Made From Translucent Zirconia.

Lotfy Elsayed Lotfy, Abeer Abd El-Aziz El-Gindy And Mohammad Osama M.Shawky,

ABSTRACT


Aim: The Current Study Aimed To Evaluate The Antibacterial Effect Of Curcumin, Photoactivated Curcumin In Comparison To Sodium Hypochlorite As Root Canal Irrigating Solutions Against Enterococcus Faecalis. Methods: Sixty Extracted Single-rooted Mandibular Premolars With A Closed Apex Were Cleaned, Disinfected And Prepared. E. Faecalis�were Inoculated In The Disinfected Root Canals Which Were Randomly Divided Into Four Equal Groups Each Of 15 According To The Type Of Irrigant Used [group (1): Saline, Group (2): 2.6% NaOCl, Group (3): Curcumin And Group (4): Photoactivated Curcumin]. Samples From Each Group Were Subjected To Microbiological Assessment At Two-time Points; Before And After Root Canal Treatment With Different Irrigating Solutions; To Detect Viable Bacterial Cells Using MTT Assay. Collected Data Were Then Statistically Compared To Determine Differences Between The Tested Root Canal Irrigants.

Results: After Using Tested Irrigant Solutions, Photoactivated Curcumin And Sodium Hypochlorite Showed A Significant Antibacterial Effect Better Than Curcumin And Saline.

Conclusions: Within The Limitations Of The Present Study, The Antibacterial Effect Against Enterococcus Faecalis Of Photoactivated Curcumin Is Comparable To 2.6% NaOCl Regarding Its Use As Root Canal Irrigating Solution.

Asmaa Salah El Din Abd El Samea Allam, Sara Ahmed Mahmoudand Sherif Bahgat Eltaweel,

ABSTRACT
Objective: This Study Was Conducted To Assess The Clinical Efficacy Of Mouthwash Containing (Green Tea With Aloe Vera) Versus Chlorhexidine (0.2%) Mouthwash, On Oral Malodor (Halitosis) And Salivary Streptococcus Mutans Counts In A Group Of Egyptian Children. Subjects And Methods: A Randomized Controlled Clinical Trial Was Performed On 54 Healthy Egyptian Children Who Were Randomly Divided Into Two Groups (27 Patients In Each Group), The First Group Rinsed With (Green Tea With Aloe Vera) Mouthwash And The Second Group Rinsed With (chlorhexidine (0.2%)) Mouthwash. The Mouth Odors Of Children Were Assessed By Investigator Nose By Applying The Smell Identification Test (Organoleptic Measurement), At Baseline Zero Min (pre-rinse), 15 Min, 7 Days (post-rinse), Saliva Samples Were Collected From The Child?s Mouth At The Baseline Zero Min (pre-rinse) And After 90 Min (post-rinse) To Determine Streptococcus Mutans Colony Counts.

Results: The Result Showed That Malodor For Both Groups, Baseline Score Of Malodor Had The Highest Mean Value Of Whole Testing Intervals, Followed By 15 Minutes, Then 1 Week, And Also That There Was No Statistically Significant Difference Between The Two Types Of Mouthwashes Regarding Their Effects On Streptococcus Mutans Counts. Conclusion: Both Group (I) Green Tea With Aloe-Vera And Group (II) Chlorhexidine (0.2%) Mouthwash Were Effective In Reducing Oral Malodor And Had Antibacterial Effects.