Yasmin Atef Ahmed, Marwa Mohamed Temirek And Mohsen Hussein Abi-Elhassan .,

ABSTRACT


Aim: To Verify The Effect Laser Pretreatment On Sealing Ability Of Resin Composite Restorations Bonded With Two Different Adhesive Approaches.

Materials and Methods: 120 Freshly Human Mandibular Posterior Teeth Were Selected. The Teeth Were Divided Into Two Main Groups According To Laser Pretreatment. Each Group Was Divided Into Two Subgroups According To The Type Of Adhesive System (total Etch System Or Self-etch Adhesive System). Each Subgroup Was Divided Into Two Classes According To Aging Period (one Day, One Month And 3 Months). Standardized Class V Were Prepared. For Microleakage Testing, The Specimens Were Immersed In 2% Aqueous Solution Of Methylene Blue For 24 Hours. Teeth Were Longitudinally Sectioned In A Buccolingual Direction. Tooth-restoration Interfaces Were Examined Using SEM. Using A Fixed Magnification Of 40x. A Digital Image Analysis System Was Used To Measure And Qualitatively Evaluate The Degree Of Dye Penetration.

Results: Laser Pretreated Groups Presented Statistically Significant Higher Microleakage Mean Values Than The Groups Not Laser Pretreated. Total Etch Groups Recorded Statistically Significant Higher Microleakage Mean Values Than Self-etch Groups. The Groups Aged For 3 Months Recorded Statistically Significant Higher Microleakage Mean Values Than 1 Month And Immediate Groups. Conclusion: Laser Irradiation Is Not A Valid Alternative To Acid Etching Pretreatment Of Cavities To Be Filled With Resin Composite Materials.

Amr Hussein Aziz , Hanaa Ibraheem Sallam And Rasha Nabil Sami,

ABSTRACT
Statement Of The Problem: Zirconia Hybrid Abutment On Implant Achieves High Mechanical Properties And Moderate Esthetic Requirements. The Increase Of Esthetic Demands Has Renewed Interest In The Search For New Materials With Enough Mechanical Properties And Better Esthetic Qualities Than Zirconia Like Lithium-disilicate Materials Which Has Been Used Recently For Construction Of Hybrid Abutments On Implants. Aim Of The Study: The Aim Of This Study Was To Evaluate The Fracture Resistance Of E.max CAD Implant Superstructures Cemented On Two Types Of Customized Hybrid Abutments Made Of Lithium-disilicate And Zirconia. Materials And Methods 14 Internal Connection Titanium Dummy Implants Were Embedded In Epoxy Resin Molds And Randomly Divided Into Two Groups ( N= 7 Each ) According To The Hybrid Abutments Material Used ; Group I : Yttria Stabilized Polycrystalline Zirconia (Y-TZP) (Katana Zirconia) And Group II: Lithium Disilicate Glass Ceramic E-max CAD .All Abutments Were Fabricated By The CAD/CAM Technique. 14 Monolithic Lithium Disilicate Glass Ceramic(e.max CAD) Crowns Simulating A Maxillary First Premolar Were CAD/CAM Fabricated And Cemented Onto The Hybrid Abutments. All Samples Were Compressively Loaded Under Axial Static Load Till Fracture Using A Universal Testing Machine With A Load Cell Of 5 KN At A Cross-head Speed Of 1mm/min. The Load Required To Fracture Was Recorded In Newton And Failure Modes Were Visually Analyzed. Statistical Analysis Was Performed Using Student T-test (P ?0.05 ). Frequent Distribution Of Failure Modes (%)was Performed By Chi Square Test (P<0.05).

Results: The Results Showed That E Max CAD Superstructures Cemented On Hybrid Zirconia Abutments Recorded Statistically Significantly Higher Mean Fracture Resistance Mean Values Than Those Cemented On Hybrid Lithium Disilicate Abutments. Regarding Failure Mode Results, All Superstructures Showed Catastrophic Fracture With Cracking And Chipping Of The E Max Cad Hybrid Abutments. On The Other Hand , Custom Made Zirconia Abutments Did Not Exhibit Any Crack Lines Or Actual Fractures. The Difference In Frequent Distribution Of Failure Modes (%) Between Groups Was Statistically Significant . Conclusions Fracture Resistance Of E.max CAD Implant Superstructures Was Affected By The Hybrid Abutment Material, With The Superiority Of Those Cemented On Zirconia Hybrid Abutments. All Tested Superstructures Could Withstand The Masticatory Forces In The Premolar Region In The Oral Cavity.

Kareem Talaat Ahmed, Hanaa I. Sallam And Rasha N. Sami,

ABSTRACT


Aim: The Aim Of The Study Was To Evaluate Vertical Marginal Gap Distance And Internal Adaptation Between Lithium Disilicate Superstructures And Lithium Disilicate Hybrid Abutments Constructed By CAD/CAM Technique And Heat Pressing Technique.

Materials and Methods: 14 Dummy Implants Were Placed In Epoxy Resin Blocks By The Aid Of A Paralleling Device Then Titanium Bases Were Screwed To The Dummy Implants. The Samples Were Randomly Assigned Into Two Study Groups (n=7 Each) According To The Construction Technique; Group I : Lithium Disilicate (e.max CAD) Hybrid Abutments And Superstructures Constructed By CAD /CAM Technique, Group II: Lithium Disilicate (e-max Press) Hybrid Abutments And Superstructures Constructed By Heat Pressing Technique. The Produced Ceramic Abutments Of Both Groups Were Cemented Onto Their Corresponding Titanium Bases Using Adhesive Resin Cement. All Superstructures Were Designed As Monolithic Upper First Premolar, Half Of Which Were Constructed By The CAD/CAM Technique And The Other Half By The Heat Pressing Technique. Vertical Marginal Gap Distance Measurements Between Each Abutment And Its Corresponding Superstructure Were Recorded At 36 Points (9 Points /surface) Using Digital Microscope. Internal Adaptation Was Measured Using Silicon Replica Technique. Data Were Collected, Tabulated And Statistically Analyzed Using Student T-test (P ? 0.05).

Results: The Heat Pressing Group Showed A Statistically Significant Lower Marginal Gap Distance Between Hybrid Abutments And Superstructures Than The CAD/CAM Group. On The Other Hand, Samples Of The CAD/CAM Group Showed Statistically Significant Higher Internal Adaptation Between Hybrid Abutments And Superstructures Than Samples Of The Heat Pressing Group. Conclusion: Vertical Marginal Gap Distance And Internal Adaptation Between Lithium Disilicate Implant Superstructures And Lithium Disilicate Hybrid Abutments Were Significantly Affected By Their Construction Technique. Heat Pressing Construction Technique Improved The Vertical Marginal Gap Distance While CAD/CAM Technique Improved The Internal Adaptationbetween Lithium Disilicate Implant Superstructures And Lithium Disilicate Hybrid Abutments.

Ghada Eslaman Tony, Nagwa Mohamed Ali Khattab And Ahmed Abdel-Hamid Abdel-Kader,

ABSTRACT
Objectives This Study Indented To Investigate The Knowledge, Attitude And Practice Levels Of Dentists In Upper Egypt Regarding Oral Cancer (OC). Methods An Observational Cross Sectional Survey Using Unnamed Questionnaire Contained 44 Items Covering Different Aspects Connected To OC Were Completely Filled By 400 Randomly Selected Licensed Dentists In Three Governorates In Upper Egypt (Minia, Assuit And Sohag). Results Rate Of Response Was 94.3%. The Overall Knowledge Level In The Current Study Was 31.8%. The Awareness About OC Risk Factors Was High Especially Smoking Tobacco And Alcohol Consumption. Also, Over 80% Of Dentists Identified Family History And HPV As Risk Factors. Only 37.5% Of Participants Performed Regular Screening Of Oral Mucosa And 26.5% Reported Lymph Node Examination. Regarding Attitude, Only One Quarter Of Dentists Attended Continuing Educating Programs About OC. A Statistically Significant Relation (p<0.0001) Between Knowledge Level And Most Demographic Variables Was Detected. There Was Fair Positive Correlation (r=0.47) Between Practice And Knowledge Scores. Conclusions A Predominant Trouble Among Dentists In Upper Egypt Regarding OC Knowledge And Practice. Continues Education And Training Programmes Are Highly Recommended.

Ahmed Osman , Jylan El-guindy And Karim Aboubakr,

ABSTRACT
Statement Of The Problem: Most Failures Of Ceramic Veneers Have Been Attributed To Fracture Which Might Be An Issue Of Crack Formation That Could Be Induced During Machining Or Laboratory Adjustments. Vita Suprinity Introduced To Offer A Stronger Glass Ceramic Material Thanks To Its Zirconia Reinforcement That Might Lead To A Better Clinical Performance In Terms Of Fracture Resistance. Also It Has Optimized Edge Stability Compared To Lithium Disilicate That Might Result In Better Marginal Adaptation, Retention And Less Post-operative Sensitivity.

Purpose: The Aim Of This Study Was To Evaluate The Clinical Performance (in Terms Of Fracture Resistance, Marginal Adaptation, Retention And Sensitivity) Of Vita Suprinity Versus IPS E-max CAD Ceramic Laminate Veneers.

Materials and Methods: A Total Of 24 Ceramic Laminate Veneers (12 IPS E-max CAD And 12 Vita Suprinity) Were Included In The Study And Completed By One Operator (the Researcher) Who Followed A Meticulous Clinical Procedure And The Ceramic Laminate Veneers Were Fabricated By One Experienced Dental Technician. The Operator Followed The Five Phases Of Laminate Veneers Fabrication: Diagnosis, Preparation Design, Provisionalization, Construction Of The Material And Cementation. Follow Up Sessions Were Done Every Two Months For One Year To Evaluate The Clinical Performance (in Terms Of Fracture, Marginal Adaptation, Retention And Sensitivity) Using Dental Probe And Direct Vision According To The Modified USPHS (United States Public Health Service) Criteria. This Was Performed By An Experienced, Blinded Investigator. Data Were Recorded, Tabulated, And Statistically Analyzed Using The Chi-square Test And The Significance Level Was Set At P ? 0.05.

Results: It Was Found That: There Was No Statistically Significant Difference Between IPS E-max CAD Laminate Veneers And Vita Suprinity Laminate Veneers In All Out Comes Where (P=1) As Both Groups Showed (100%) Alpha In All Time Periods.

Conclusions: Within The Limitations Of This Clinical Study, Both IPS E.max CAD And Vita Suprinity Laminate Veneers Revealed High Successful Clinical Performance In Terms Of Fracture Resistance, Marginal Adaptation, Retention, And Post-operative Sensitivity.

Sarah M. El-Ayoutti, Basma G Moussa, Omniya A. Aziz And Mamdouh A. Hassan,

ABSTRACT
The Aim Of This Study Was To Assess The Incidence Of Fistula In Isolated Cleft Palate Patients Repaired By Furlow Double-opposing Z-plasty Versus Two-flap Palatoplasty At Different Follow-up Periods. One Case Of The Furlow Group Showed Fistula Formation. However, Three Cases Had Nasal Regurgitation Only In The Two Flap Group. Amount Of Intra-operative Blood Loss Was Significant In The Furlow Group; It Was Mostly Related To The Extent Of The Surgical Field And Time Of Surgery.

Seham Hazem El-Ayouti, Hend Mohammed Waguih , Nermine Raouf Amin And Enji Ahmed Mahmoud,

ABSTRACT
Background: Oral Lichen Planus (OLP) Is A Chronic Immunologic Disorder. Patients With OLP Have An Increased Risk Of Developing Oral Squamous Cell Carcinoma (OSCC). Smoking Is Associated With Potentially Malignant Disorders Of The Oral Mucosa As OLP. In This Study We Aimed To Determine The Effect Of Smoking On ABCG2 Protein Expression In OLP Patients As An Assessment For Malignant Transformation.

Materials and Methods: Patients Were Divided Into Four Groups; 10 Individuals In Each Group With A Total Number Of 40 Individuals As Follows: Group I: Non-smoker Control, Group II: Smoker Control, Group III: Non-smoker Patients With OLP And Group IV: Smoker Patients With OLP. Area Percent Of Immunohistochemical Expression Of ABCG2 Was Measured By Software Leica Qwin 500.

Results: The Greatest Mean Area Percent Was Recorded In Lichen/ Smoker Group, Whereas The Lowest Value Was Recorded In The Control Group. The Difference Between All Groups Was Not Statistically Significant. Conclusion: ABCG2 Could Not Be Used As A Predictor For Malignant Transformation In Smoker OLP Patients As It Was Not Significantly Overexpressed In These Patients.

Amira Aboalnaga, Mona Salah Fayed And Sanaa Abo Zeid,

ABSTRACT
Background: Among The Recent Modalities Introduced To Accelerate Orthodontic Tooth Movement (OTM) Is Micro-osteoperforations (MOPs), Literally Meaning Puncturing Of Bone. Objective: The Primary Aim Of This Split-mouth Study Was To Evaluate The Effect Of (MOPs) On The Rate Of (OTM). Methods: 18 Patients Who Required Maxillary Canine Retraction Into First Premolar Extraction Sites As Part Of Their Orthodontic Treatment Completed This Study. Leveling And Alignment Proceeded Till 0.016� � 0.022� NiTi Upper Archwire, Indirect Skeletal Anchorage Was Prepared, Then The Patients Were Referred For Upper 1st Premolars Extraction. Three Months Later, 0.017� � 0.025� Stainless-steel Upper Archwire Was Inserted And Three Vertically Aligned MOPs Were Performed Distal To The Canine Using A Single TAD Unilaterally, While The Other Side Served As Control. NiTi Closing Coil Springs Delivering 150 Gms Of Force Were Used For Canine Retraction. Data Were Collected From Monthly Upper Impressions, Which Were Used To Obtain Digital Models, In Addition To Pre- And Post-retraction Maxillary CBCT Images.

Results: The Mean Difference Of The Distance Traveled By The Canine Cusp Tip Was Greater In The MOP Group Than The Control Group By (0.06 � 0.7mm) (P > 0.05(. The Mean Differences Of The Distance Traveled By The Canine Center And Apex Were Significantly Greater In The MOP Group Than The Control Group By (0.37 � 0.63 Mm, P < 0.05( And (0.47 � 0.56 Mm, P < 0.01) Respectively.

Conclusions: Within The Limitations Of This Study, The Micro-osteoperforations Seemed To Facilitate Root Movement Yielding More Bodily Canine Retraction.

Heba-T-Allah Mohamed Mohamed Metwally, Inas Mohy El-Din, Shaymaa Mohamed Nagi And Rasha Haridy .,

ABSTRACT


Aim: This Study Was Conducted To Study The Effect Of Curing Mode Of Acetone-based Vs. Solvent-free Self-etch Adhesive Systems On The Resin-dentin Bond Strength At Different Dentin Depth And Time Intervals.

Materials and Methods: A Total Of 120 Recently Extracted Caries-free Human Molars Were Selected. Three Adhesive Systems Were Tested In This Study; [Nano-Bond� Two-step Acetone Based Self-etch Adhesive (NB)], [Nano-Bond� Two-step Acetone Based Self-etch Adhesive + Nano-Bond� Dual Cure Activator (NB+DC)], And [Bond-1 SF Solvent Free One-step SE Adhesive (SF)]. Teeth Were Prepared Either To Expose Superficial Or Deep Dentin. The Prepared Dentin Specimens Received The Adhesive Systems Of Each Subgroup According To The Manufacturer�s Instructions. Resin Composite Was Build Up On Bounded Dentin Substrate. Restored Specimens Were Aged Either For 48h Or Three Months, Then Each Restored Tooth Was Sectioned Into Sticks Of (1 � 0.05) Mm2 Thickness To Be Tested For Microtensile Bond Strength (�TBS) Using Universal Lloyd Testing Machine Travelling At A Cross-head Speed Of 0.5 Mm/minute Until Failure.

Results: Results Revealed That (SF) Group Recorded The Highest Statistically Significant (p<0.05) �TBS Mean Value (23.93� 1.04 MPa) Followed By (NB+DC) Group (22.97� 1.71 MPa), While (NB) Group Recorded The Lowest Statistically Significant (p<0.05) �TBS Mean Value (21.22� 0.43 MPa) As Indicated By Three-way ANOVA Test. There Was Non-significant (p>0.05) Differences Between (SF) And (NB+DC). Moreover; There Was No Significant (p>0.05) Differences Between (NB+DC) And (NB). There Was No Statistical Significant Effect For Either Dentin Depth Or Aging Periods On Resin-dentin Microtensile Bond Strength Of All Tested Adhesive.

Conclusions: Solvent Free Light Cure Dentin Adhesive May Constitute A Promising Adhesive Concerning The �TBS Irrespective Of Either Dentin Depth Or Time Intervals. Adding A Dual Cure Activator To Acetone Base Dentin Adhesive May Had No Obvious Benefits On The Resin-dentin �TBS Regardless Dentin Depth And Time Intervals.

Ahmed Nasef Abdelhameed And Wael Mohamed Mubarak. Refai,

ABSTRACT
Abstract:

Aim: The Study Was Conducted To Provide A Three Dimensional Evaluation Of The Synergistic Effect Resulting From Combined Low Energy Laser Application And Micro-Osteoperforations On The Maxillary Canine Retraction In Orthodontic Patients. Patients And Methods: Three Parallel Groups (each Group Contained 10 Patients) Were Performed; Group A: Split Mouth Study Design In Which One Side Was Control Side And The Other Side Received Micro-osteoperforations (MOPs), Group B: Split Mouth Study Design In Which One Side Was Control Side And The Other Side Received Low Level Laser Therapy (LLLT), Group C: Split Mouth Study Design In Which One Side Was Control Side And The Other Side Received Both MOPs And LLLT. All Patients Were Radiographed By CBCT Images Before And After Canine Retraction And DDS-Pro Soft-ware Was Used For Evaluation Of The Maxillary Canine Retraction.

Results: Significant Statistical Differences Were Obvious In The Rate Of Canine Retraction Between Each Intervention And The Control Sides As Follow; The Mean Distance Travelled By The Canine Cusp Tip Point Relative To The Frontal Plane In Three Months In The Control Group Was 2.25 Mm�1.46 Mm, In The MOPs Group Was 3.86 Mm�1.56 Mm, In The LLLT Group Was 3.55 Mm�1.63 And In The Combined MOPs& LLLT Group Was 4.81 Mm�1.56 Mm. Conclusion: MOPs Technique Has The Ability To Accelerate The Rate Of Canine Retraction More Than The Application Of LLLT As Compared To The Standard Canine Retraction Technique. Moreover: Combination Of MOPs And LLLT Proved To Be More Efficient Regarding Increasing The Rate Of Canine Retraction Than The Application Of Each Technique Separately.