Mohamed N. Abass, Enas Fathelbab And Yasser F. Hussein,

ABSTRACT


Purpose: The Aim Of This In Vitro Study Was To Evaluate The Effect Of High Concentrated Light Activated Bleaching Agent On Surface Roughness And Wear Resistance Of Conventionally And CAD � CAM Fabricated Feldspathic Ceramic Restorations.

Materials and Methods: A Total Of Forty Cubic Samples Were Prepared. Samples Were Divided Into Two Equal Groups (20 Samples Each) According To Type Of Tested Ceramic. Each Group Was Subdivided Into Two Subgroups (10 Samples Each) According To Type Of Testing. All Samples Subjected To 35% HP (BEYOND Max5�) Light Activated Bleaching Gel. Surface Roughness Measurements Were Recorded For All Tested Samples Before Any Treatment To Provide Baseline Values As A Control Group. A Micro-saw Was Used To Cut Blocks (VITABLOCS�MarkII) Into Standardized Cubes. A Specially Designed Acrylic Mold Was Used For Construction Of Samples To Standardize The Shape And Dimensions Of The Cubic Samples. Predetermined Proportions Of (VITAVM�7) Dentin Powder And Build Up Liquid Was Used According To The Manufacturer�s Instructions. Twenty Teeth Caries And Crack Free (premolars) Were Collected, A Micro-saw Used To Cut Teeth Into Equal Half In Vertical Section. All Samples Stored In Distilled Water Before And After Bleaching. Samples Of Both Types Of Ceramics Were Photographed Before And After Bleaching By USB Digital Microscope With A Built-in Camera For Surface Roughness Measurements. Wear Resistance Was Assessed By Weight Loss Of Tested Samples. Weight Was Measured By Electronic Analytical Balance. Chewing Simulator Device Was Used To Simulate The Vertical And Horizontal Movements In The Oral Cavity.

Results: Results Showed That There Was No Statistically Significant Difference Between Mean Values Of Ra Of The Two Tested Ceramic Types. However, Both Tested Materials Showed Statistically Significant Lower Mean Values Of Ra Than Tooth Structure But There Was No Statistically Significant Difference Between Changes In Surface Roughness (?Ra) In The Three Groups Either Before Or After Bleaching. There Was No Statistically Significant Difference Between Mean Values Of Wear Of The Two Ceramic Types. The Wear Ranged (0.49 To 72) The Maximum Wear Was Found In (VM 7) While The Lowest Was In Tooth Structure. That Was Interesting To Find That The Wear Of Tooth Structure (0.42) Which Is Significantly Less Than Two Types Of Dental Ceramics.

Conclusions: High Concentrated Light Activated Bleaching Agents Have No Effect On Surface Roughness And Wear Resistance Of Dental Ceramic. Both Types Of Dental Ceramics (fine Structure Feldspathic Porcelain) Have Mild Abrasive Effect On Antagonist Natural Teeth. Industry Manufacture Dental Ceramics Showed More Wear Resistance Than Conventional One.

Bakr Akram Saber Al-Alousi , Ali Ali Mortada And Manal Ahmed El Sheikh,

ABSTRACT
The Aim Of The Study Was To Evaluate Caries Prevalence, Oral Hygiene Measures, Dietary Habits And Dental Care Among (6-12 Years Old) A Group Of Iraqi Children In Erbil Governorate Compared With A Similar Group Of Egyptian Children At Same Age In Cairo Governorate. Subjects And Methods : This Study Was Planned To Assess Prevalence Of Dental Caries Among A Group Of 6-12 Years Old Iraqi Children In Northern Of Iraq Represented By Erbil Governorate Compared With A Similar Group Of Egyptian Children At Same Age In Cairo Governorate. Four Public Primary Schools Were Selected From Erbil City And Outpatient Clinics Of Pediatric Dentistry And Dental Public Health Department, Cairo University From Cairo City Were Included. This Observational Study Was Carried Out On 1340 Children, Divided According To Geographic Location Into 2 Groups; 670 Children Were Iraq Study Group Children, While 670 Students Were Egypt Study Group Children.

Results: Data Were Collected Through A Questionnaire-based Survey. Structured Close Ended Questionnaire Used To Assess Their Ages, Gender, Eating Habits, Oral Hygiene Measures, And Frequency Of Dental Care. All Children Participated In This Study Were Examined For: Dental Caries Experiences In Primary And Permanents Teeth Using Def And DMF Indices.

Rehab Ali Abd ElGany Hassan, Maged M Negm And Reham Seyam,

ABSTRACT
Objective: This Study Aimed To Evaluate The Adaptability, Bioactivity And PH Of Endosequence BC Sealer (BC Sealer) And Biodentine Calcium Silicate Based Materials In Comparison To The Gold Slandered AH Plus Sealer, A Resin Based Sealer. Methods: Fifteen Extracted Human Anterior Teeth Were Prepared For Adaptability Evaluation Using Ni-Ti ProTaper Rotary Files. Teeth Were Randomly Allocated Into Three Groups (n=5/ Each Material). Group 1and 3 Roots Were Obturated Using F5 Gutta-percha Cones With Endosequence BC And AH Plus Sealers Respectively, While In Group 2 Roots Were Obturated By Biodentine. Obturated Roots Were Stored At 37? In 100% Relative Humidity For 7 Days, And Then Root Dentine To Material Interface Was Examined For Gaps Formation Using Scanning Electron Microscope. To Determine Bioactivity Thirty Root Sections Were Filled With One Of The Materials (n=10/ Each Material) And Immersed In PBS For 7and 30 Days (n =15/ Each Period). Ca- And Si-incorporation Amount Into Adjacent Dentine Was Measured Using An Energy Dispersive X-ray Analysis. For PH Investigation Thirty Root Sections Were Prepared As Mentioned In Bioactivity Evaluation Then Immersed In PBS Or Butyric Acid For 7 Days (n = 15/ Each Media).

Results: Endosequence BC And AH Plus Showed More Gaps Compared With Biodentine, With No Significant Differences Among Them. Biodentine Released More Ca- And Si And Presented More Alkaline PH Followed By Endosequence BC, While AH Plus Showed The Lowest PH And Ion Release.

Conclusions: Biodentine Was Better Than Endosequence BC And AH Plus In Adaptability, Bioactivity And PH. So It Is Indicaed In Cases That Require Healing.

Nada M. Salem, Mohamed A. F. Kaddah, Mona M. Salah Fayed And Fady Hussein Fahim,

ABSTRACT
Aim Of The Study: To Compare The Two Used Methods Of Indirect Bonding Regarding (Vinyl Polysiloxane VPS Tray And A Soft Vacuum-formed Tray) The Patient�s Satisfaction During The Bonding Procedure.

Materials and Methods: A Randomized Controlled Trial Was Performed, 21 Subject With Fully Erupted Upper And Lower First And Second Permanent Molars Showing No Signs Of Enamel Defects Or Signs Of Gingival Inflammation Were Recruited In This Study. 168 Attachments Were Bonded To First And Second Molar Teeth. A Questionnaire Was Given To Each Subject To Measure Their Satisfaction Towards The Used Indirect Bonding Trays. After Placement Of Molar Tubes On The Working Model, A Vinyl Polysiloxane VPS Tray And A Soft Vacuum-formed Tray Were Fabricated, One On Each Half Of The Working Model, Then The Tubes Were Transferred To The Patient�s Dentition. Conclusion: The Vinyl Polysiloxane (VPS) And The Vacuum-formed Trays Used To Indirectly Bond Orthodontic Attachments Were Found To Be Equally Satisfying To The Patient.

Hossam Maher Mahmoud, Hatem. E. Amin, Olfat. M. Gaballah And Hussein. I. Saudi,

ABSTRACT
Background: There Are Many Tools For Identification Of Human Remains, Via Radio Graphical Imaging, Histological Processing & Microscopical Examination Of Dental Remains.

Purpose: To Assess And Compare The Accuracy Of Cemental Annulations And Con Beam Computed Tomography For Age Estimation Among Adults

Materials and Methods: One Hundred And Twenty Intact, Non-carious And Single Rooted Extracted Teeth Were Evenly Distributed According To Gender And Different Age Groups In To Four Groups. Each Group Contained 30 Extracted Teeth (10 Incisors, 10 Canines And 10 Premolars).The Ages Of The Patients Ranged From 30 To 69 Years Old. All The Examined Teeth Were Imaged By A Cone Beam Computed Tomography Scanner And Examined By Cemental Annulations

Results: For All Participants, In Total And In The Age Group Between 30 To 50 The Mean Differences Between Chronological Ages And Dental Ages Estimated By Cone Beam Were Significantly Higher Than The Corresponding Values Of The Mean Differences By Cemental Annulations While There Were No Significant Difference In The Age Group Between 50 To 69. Conclusion: For Total Participants, Teeth Cemental Annulations Method Is More Accurate Than Cone Beam Computed Tomography For Dental Age Estimation In Adult. Considering Gender, Cemental Annulations Method Is A More Accurate Age Predictor Than Cone Beam Computed Tomography Among Males And Total Female Participants. Regarding Teeth Type, Cemental Annulations Method Is A More Precise Age Estimation Tool For Premolars With Equal Accuracy Of Both Methods For Incisors And Canines.

Yasser Arafat Hassanin Amin, Basma Gamal Moussa And Nesrine Khairy,

ABSTRACT
The Aim Of The Study : Evaluation Of The Osseointegration Of Direct Laser Metal Forming Immediate Implants For Replacement Of Upper Anterior Teeth.

Materials and Methods: Twelve Patients With A Need For Upper Anterior Teeth Replacement Was Randomly Assigned To Be Treated With Direct Laser Metal Forming (DLMF) Immediate Implant (Tixos). Implants Were Loaded After 6 Months Of Placement. The Follow Up Was Clinical Evaluation Included (Bleeding On Probing, Pocket Depth, Plaque Index ,Gingival Index), A Comparison Table Between One Week After Loading And 6 Months After Loading. Radiographically A Cone Beam C.T Was Taken After 1 Week Of Placement And 6 Months Of Placement Were Evaluated For Change In Relative Bone Density Adjacent To The Implants. Results : All Implants Showed Initial Primary Stability And Good Signs Of Osseointegration With Absence Of Any Signs Of Failure. The Clinical Evaluation Was Enhanced After 6 Months Of Loading Comparing To 1 Week After Loading. The Mean Relative Bone Density Increased After 6 Months Of Implant Placement Comparing To One Week After Placement. Conclusion : All Twelve Implants Have Been Successfully Present In The Bone And Completely Osseointegrated By Complete Bone Formation And Density Around All Implants That Can Function With Good Esthetics.

Marwa Hassan Mostafa ,, Ali Abdulghani AlSourori, Amal Fathy Kaddah, Magda Ismail Ramzy, Ahmed Emad Fayyad And Wessam M Dehis,

ABSTRACT


Purpose: The Aim Of This Study Was To Evaluate Implant Stability In Single Implant Versus Two Implant Mandibular Over-denture Of Completely Edentulous Patients.

Materials and Methods: Twenty Four Completely Edentulous Patients Were Divided Randomly Into Two Groups, Intervention Group Received Single Implant Supported Overdenture, While The Conventional Group Received Two Implant Supported Over Denture. Osstell Device Was Used To Measure Implant Stability. Implant Stability Was Measured Equally For The Two Groups. At First Primary Stability Was Measured At Time Of Implant Insertion After That Secondary Implant Stability Was Measured Every Three Months Up To Nine Month

Results: Comparing The Two Groups During The Whole Study Period, The Results Demonstrated That No Differences In Implant Stability Between Two Groups. (P Value < 0.05) Conclusion Regarding Initial And Delayed Implant Stability, Minor Changes Were Observed Between The Two Groups During The Whole Follow Up Periods. Implant Stability Of Single Implant Supported Over Denture Is Closer To Two Implant Supported Over Denture.

Marwa Abd El-Aziz Abd El-Wahab El-Sayed, Zeinab Ahmed Hussein El-Shorbagy And Manal Ahmed El-Ebiary And Emad Abd-Allah Mabrouk,

ABSTRACT


Purpose: The Aim Of This Study Is To Compare Acrylic, Acrylic Reinforced With Glass Fibers And Flexible Acrylic Denture Base For Single Implant Overdentures Retained By Ball And Socket Attachment.

Materials and Methods: It Was Classified Into 3 Equal Groups According To The Tested Materials. Fratigue Test Was Made For All Samples Of The Three Groups. The Dental Implant Was Embeded Vertically In The Middle Of A Cold Cured Acrylic Resin. Ball And Socket Attachment Was Used. Specimens 60 Mm Long, 1.5 Mm Thick, And 10 Mm Wide Was Fabricated From Baseplate Wax. Fabrication Of Conventional Acrylic Resin And Acrylic Resin Reinforced With Glass Fibers Samples: Chopped Glass Fibers Were Added In Concentration 5 % By Weight. Heat Polymerized Denture Base Resin Was Used According To The Manufacturer,s Instructions To Pack The Flasks. Fabrication Of Nylon Samples: Investment Is Done In A Special Flask. Deflasking Is Completed And Specimens Were Finished And Polished.

Results: It Was Found That Conventional Group Recorded The Highest Number Of Cycles Mean Value Followed By Flexible Group While Fiber-reinforced Acrylic Group Recorded The Lowest Number Of Cycles. It Was Found That Conventional Group Recorded The Highest Fatigue Strength Followed By Fiber-reinforced Acrylic Group While Flexible Group Recorded The Lowest Cyclic Flexure Strength Mean Value. The Result Of This Study Show That No Breakage Occurs To The Flexible Samples. Conclusion: Conventional Group Recorded The Highest Fatigue Strength Then Fiber-reinforced Acrylic Group Followed By Flexible Group.

Mohamed A. Bassyouni, Ahmed El Barbary And Amr Zahran,

ABSTRACT
Objective: To Compare The Amount Of Periimplant Defect Reduction (VDD And HDD) And Buccolingual Dimension Reduction With And Without The Placement Of Beta Tricalcium Phosphate Into The Buccal Periimplant Defect Following Implant Installation Into Fresh Extraction Socket. Materials And Methods:16 Implants Were Placed Into 16 Patients, 8 Implants In The Test Group (grafted) And 8 Implants In The Control Group (non-grafted). Buccolingual Dimension Was Measured On The Preoperative CBCT, While The Horizontal And The Vertical Defect Dimension Were Measured Clinically Using A UNC Periodontal Probe Following Immediate Implant Placement. After 6 Months Of Healing, A Second CBCT Was Taken For The Evaluation Buccolingual Dimension Reduction And The Implants Were Exposed Using ��M�� Flap Technique For Direct Bone Measurements. In The Test Group, The Defects Were Completely Filled While In The Control Sites, There Was Variability In The Amount Of Bone Fill. Results : Regarding The Change In The Buccolingual Dimension, Results Showed That There Was Statistically Significant Difference Between Groups. The Reduction In The Vertical (VDD) And Horizontal (HDD) Defect Dimension Was Statistically Significant In Each Group Between The Baseline And The Re-entry After 6 Months And Between Groups After 6 Months. Conclusion: Although The Placement Of Biosorb (?-TCP) In The Buccal Peri-implant Defect Did Not Counteract The Bone Dimensional Alteration After Tooth Extraction And Immediate Implant Installation, It Contributed To Decreasing The Magnitude Of Buccolingual Dimension Reduction. Both Treatment Approaches Produced Significant Reduction In The Vertical As Well As The Horizontal Periimplant Defect Dimension. However, The Placement Of The Bone Graft Into The Buccal Peri-implant Defect Produced Better Bone Fill Compared To Spontaneous Healing Of The Defect.

Mostafa Saad Swedan, Amal Fathy Kaddah And Ahmed Emad Fayyad,

ABSTRACT

Objectives: Telescopic Denture Have Been Documented To Retain Dentures More Effectively Than The Conventional Claps System Because Of Their Ability To Transmit Occlusal Loading To The Long Axis Of The Abutment Tooth And To Provide Guidance, Support And Protection From Movement. Nowadays, The CAD CAM Technology Became One Of The Most Important Developments Happened In The Dental Field At The Twenty-one Century. Consequently, All Dental Labs Started To Shift Their Services To The Digital Manufacturing Where Less Material Consumed, Saving Time And Effort And Capability Of Mass Production CAD/CAM Technologies Can Be Successfully Applied In The Fabrication Of Removable Partial Denture Alloy Frameworks. The Aim Of This Study Was To Evaluate The Patient Satisfaction And Biting Force In In Partially Edentulous Patients With Mandibular Distal Extension Removable Partial Dentures Retained By CAD-CAM Designed Telescopic Crowns In Comparison To That Retained By Conventional Clasps. Methods: This Study Was Conducted On Forty Two Patients To Evaluate Two Treatment Modalities Used For Rehabilitation Of Mandibular Distal Extension Cases To Study The Effect On Biting Force And Patient Satisfaction. At The Beginning, All Selected Patients Were Introduced To A Randomization Process To Be Divided Randomly Into Two Groups Identical In Number 21 Patient In Each Group. First Group: (intervention Group) The Patient Received Mandibular Telescopic Partial Dentures Designed By CAD/CAM System. Second Group: (control Group) The Patient Received Mandibular Removable Partial Dentures Designed By CAD/CAM System.

Results: Telescopic RPD Group Recorded Statistically Significant Improvement When Compared To Clasp Retained RPD At Three And Six Months Follow-up Periods. P Value < 0.0001 And Also This Group Showed Statistically Significant Improvement Of The Biting Force Compared To That Of Clasp Retained RPD Group At All Follow-up Periods. (P<0.05). Conclusion: Both Treatment Groups Improve Patient Satisfaction And Biting Force But The Biting Force Produced By Telescopic Mandibular Denture Greatly More Than Produced By Mandibular Removable Partial Denturesand Also Patient With Telescopic Dentures Were More Satisfied Regarding Denture Stability And Chewing Ability Items Than With Removable Partial Denture.