Ahmed E. Dawoud, Nahed A. A. Abo Hamila, Hussein I. Saudi And Neveen A. Shaheen,

ABSTRACT

Objectives: To Compare Pulp Revascularization And Apexification In Immature Non-vital Permanent Incisors Related To Clinical Evaluation.

Materials and Methods: 30 Immature Permanent Incisors Of Children (7-9 Years Old) Had Irreversible Pulpitis Or Necrotic Pulp Were Selected And Randomly Divided Into 2 Groups; Group I: 15 Teeth Were Treated With Pulp Revascularization And Group II: 15 Teeth Were Treated With MTA Apexification. Each Tooth Was Completely Isolated With A Rubber Dam Then Access Opening Was Done. Irrigation Of The Pulp Chamber With 2.5% NaOCl Then Sterile Saline And Water. Then The Root Canal Was Dried With Paper Points And Triple Antibiotic Paste (TAP) Was Applied And It Was Removed By Saline Irrigation After Two Weeks. In Group I (revascularization) Bleeding Enhancement Was Done And MTA Material Was Applied Over The Formed Blood Clot While In Group II (apexification) The Whole Root Canal Space Was Filled With MTA. Finally, Pulp Chamber Was Filled With GIC Filling In Both Groups.

Results: There Were No Statistically Significant Difference Between Groups Regarding Clinical Evaluation Criteria.

Conclusions: Revascularization And MTA Apexification Techniques Resemble In All Clinical Criteria.

Amal Mohamed Basyouni , Ali Mohamed El-sheikh And Nahed Ahmed Kashief,

ABSTRACT
The Aim Of This Study Was To Evaluate The Implant Supported Fixed- Detachable Mandibular Unilateral Distal Extension Bases With Two Different Cantilever Lengths Clinically And Radiographically.

Materials and Methods: 10 Partially Edentulous Patients With Mandibular Class II Kennedy Classification With Their Age Ranged From 25-55 Years And Divided In Two Groups. For Group I Had Received Two Implants At The Second Premolar And At The First Molar Regions. Three Unit Fixed Detachable Screw Retained Partial Denture With Distal Cantilever 7 Mm Was Fabricated. For Group II Had Received Two Implants At The Second Premolar And At The First Molar Regions. Three Unit Fixed Detachable Screw Retained Partial Denture With Distal Cantilever 10 Mm Was Fabricated. The Dental Implants Were Placed Using Conventional Delayed Loading Technique. Patients Were Recalled After 3, 6 And 12 Months As Regards To The Success And Survival Rate, Gingival Bleeding Index(GBI), Probing Pocket Depth(PPI) And Calculus Index(CI) And Radiographic Evaluation Of Marginal Bone Level (MBL) Using (Digora System).

Results: All Fixtures Were Successfully Osseointegrated By The End Of The Study. The Overall Cumulative Survival Rate Was 100%.Implant Level Technical Success Rate Was90% Group I And 80%.Group II. There Was Gradual Increase In The Clinical Parameters((GPI), (PPD) And (CI) And(MBL) From Baseline To The End Of The Evaluation Period. In Comparing The Mean Differences And Standard Deviations Between Both Groups There Was Non-significant Differences Throughout The Whole Evaluation Periods Except For The PPD Of The Implant At The Second Premolar And First Molar Regions At 12 Months Of Evaluation And CI Of The Implant At The First Molar Region At The 6 Months Of Evaluation Period.The Mean MBL For The Distal Surface Of The Implant At The Region Of The First Molar In Group II Was Non Significantly Higher Compared To The Same Implant In The Other Group At 12 Months Of Evaluation Period.

Conclusions: It Was Found That The Concept Of Cantilevered Implant Supported Fixed-detachable Screw Retained Prosthesis Was An Ideal Treatment To The Problem Of Class II Mandibular Kennedy?s Classification And Keeping The Size Of The Cantilever To The Mesiodistally Dimension Of 7 Mm Was Considered Satisfactory.

Ereny Isaac, Mona Riad And Mohamed Mostafa,

ABSTRACT


Aim: The Aim Of This Study Was To Evaluate The Effect Of Different Solvent Type Of Adhesive Systems Applied To Dry And Moist Dentin On The Microtensile Bond Strength Of Resin Composite To Dentin After 24 Hours And 3 Months Of Cyclic Loading.

Materials and Methods: A Total Of 60 Teeth Were Used In The Study. The Teeth Were Randomly Divided Into 3 Groups Of 20 Specimens Each (n=20) According To The Solvent Type Used (A), Single Bond Universal (ethanol-water), Futurabond M+ (ethanol) And Solobond M (acetone). Each Group Was Subdivided Into Two Subgroups Of 10 Specimens Each (n=10) According To Wet Or Dry Dentin Technique Used (D). Each Subgroup Was Divided Into 2 Classes Of 5 Specimens Each (n=5) According To The Number Of Received Cycles Of Mechanical And Thermo Cycling Loading That Represent 24 Hours And 3 Months (T). Adhesive System As Well As Composite Resin Application Was Done According To Manufacturer?s Instructions. Mechanical Aging Was Performed Using Programmable Logic Controlled Equipment (ROBOTA Chewing Simulator). Restored Teeth Were Serially Sectioned To Obtain Beam-shaped Specimens, With A Cross Section Area 1.0mm2. Results Were Tabulated And Statistically Analyzed Using Three-Way ANOVA Followed By Pairwise Comparison With Post Hoc Tukey Analysis And The Significance Level Was Set At P � 0.05.

Results: Cyclic Loading Showed A Significant Effect On The Microtensile Bond Strength At P�0.026.The Different Adhesives Performed Almost In A Similar Manner In Dry & Moist Conditions After 24h Cyclic Loading Except For The Ethanol-water Based Adhesives Which Performed Better In Dry Condition Compared To The Moist One. Conclusion: Under The Limits Of The Present Study It Could Be Concluded That: The Solvent Type Of The Adhesive System Does Not Affect The Bond Strength. Ethanol-water Based Adhesive Systems Act Better When Applied To Dry Dentin Compared To Moist Dentin.

Shaimaa Mostafa Omar, Mohamed Farag Ayad And Mohammed Sedikk Mohammed,

ABSTRACT
Statement Of Problem: Most Clinical Failures Of Endodontically Treated Teeth Restored With Dowels Are The Result Of Cementation Failure At The Resin / Dentin Interface. Purpose : This In-vitro Study Evaluates The Influence Of Reinforced Dental Adhesive On Push-out Bond Strength Of Glass Fiber Dowels. Materials And Method: Thirty Freshly Extracted Human Upper Central Incisors Were Selected. All Root Canals Were Instrumented, Obturated And The Dowel Space Was Prepared To Depth 9 Mm. The Specimens Were Classified Into Two Groups According To Cementation Technique Of The Dowels. Group I: Self-etch Adhesive Cement. Group II: Self-etch Adhesive Cement With Bond Incorporate With Hydroxyapatite Nanoparticles. Relyx? Ultimate Resin Cement Was Used For Dowels Cementation. From Each Specimen, 3 Dowel/dentin Sections Were Obtained, Each 1-mm Thick. Three Sites Along The Root Were Evaluated (cervical , Middle And Apical). Specimens Were Submitted To Push-out Bond Strength Test Using A Computer Controlled Materials Testing Machine With A Load Cell Of 5 KN And Loaded At A Crosshead Speed Of 0.5 Mm/min. Data Were Analyzed With One-way Analysis Of Variance (ANOVA) And Independent T-test (� =0.05).

Results: The Bond Strength Of Fiber Dowels Affected By Hydroxyapatite Nanoparticles Incorporation. It Was Found That Experimental Group Recorded Statistically High Significant Mean Value (10.3�2.5 MPa) Than Control Group (8.3 � 1.6 MPa) As Indicated By Independent T-test. Conclusion: Incorporation Of Hydroxyapatite Nanoparticles In Self-etch Adhesive System Increase Push Out Bond Strength Of Fiber Dowels In Comparison To Conventional Type.

Bahaaeldeen M. Elgarba, Ahmed Alam-Eldein And Mohamed M. El-Sheikh,

ABSTRACT


Purpose: The Purpose Of This In-vitro Study Was To Examine The Effect Of Cleansing Solutions On Surface Changes Of Retentive Clips Of Overdenture Bar Attachments.

Materials and Methods: 40 Yellow Hader Bar Clips Were Equally And Randomly Divided Into Two Groups According To Type Of Cleansing Solution(Tape Water And Corega), Each Group Divided Into 2 Equal Numbers According To Storage Time (1/2hour, 1hour). Each Tested Specimen Consist Of Two Parts Block A Contained Of Two Implants And The Bar In Custom Made Rectangular Acrylic Resin Block , Block B Contained Of Yellow Hader Clip And Metal Housing. Retention Force Was Measured Using Universal Testing Machine And Wear Of The Clips Were Checked Before And After Immersion In Cleansing Agents For 6 Months Simulation, The Clips Were Observed Under The Microscope Using Scanning Electron Microscope. The Peak Load-to-dislodgement Of The Specimens After Each Pull Was Recorded, The Data Were Collected And Analyzed By T Student-test And Analysis Of Variance (ANOVA) And Followed By Tukey?s HSDtest When P Value �0.05 Considered Significant.

Results: There Was Decreacse In Retention Force After � Hour And 1 Hour Immersion In Water And Corega But It Was Not Significant.Observation Of Plastic Clip Under Scanning Electron Microscope Indicated That Surface Changes As Cracks And Voids And Roughness Increase After 1/2 Hour And 1 Hour Immerssion In Both Water And Corega When Compared To The Initial Images.

Conclusions: Different Storage Times Of Denture Cleansing Solutions Corega Tabs And Water Have No Effect On The Retention Of Bar Overdenture Attachments. Scanning Electron Microscopic Revealed Surface Changes In Plastic Clips After Immersion In Corega And Water.

Mohamed M. Farag, Hesham M. El-Hawary And Mostafa M. Ezz,

ABSTRACT
Background And Objective: The Aim Of The Present Study Was To Assess The Bone Formation Around Dental Implants Placed Simultaneously In Posterior Maxilla Using Tutogen Xenograft Material Versus Autagenous Bone Graft. Patient And Method: The Lack Of Sufficient Height Of The Dental Bone In The Posterior Region Of The Upper Jaw Or The Expansion Of The Nasal Sinus Cavity Causes Many Difficulties When Trying To Replace This Area By Installing Dental Implants. It Was Found That The Increase In The Expansion Of The Nasal Sinus Cavity And The Accompanying Atrophy Of The Bone Has A Significant Impact On The Possibility Of Successful Implantation, And There Is No Doubt That The Length Of The Extraction Of The Tooth Has A Significant Impact On Atrophy Of The Dental Bone And Also The Expansion Of The Nasal Sinus In These Bones. This Study Included Twenty Number Of Implants Performed On Fourteen Male Patients Suffering From Atrophy Of The Posterior Jawbone Or Excessive Expansion Of The Nasal Sinus Cavity, Or Both. These Patients Were Chosen After Making Sure They Are Completely Free Of Any Organic Diseases That May Cause Any Complications During The Surgery Or Affect Bone Formation Around Implants. In This Study, The Nasal Sinus Was Raised By Making A Small Opening In The Upper Jawbones, The Side Wall Of The Nasal Sinus With Rotating Tools Under The Abundant Flow Of The Salt Solution, In Preparation For The Detection Of The Opaque Inner Layer Of The Nasal Sinus.

Results: The Results Of The Message Showed That The Value Of Measuring Bone Density Adjacent To Implants Increased During The Healing Period Of Dental Implants Except For Their Value During The First Month After Implantation. The Results Showed A Decrease In Bone Density. Conclusion: Within The Context Of This Study, The Following Conclusions Can Be Listed: The Placement Of The Implant Using The Lateral Window Technique Was A Predictable And Safe Procedure For Both For Patients And Surgeons. Tutogen As A Graft Material Had Shown A Good Results Regarding The Healing And Volumetric Changes Of The Graft As In Autogenous Bone Graft.

Amal Hassan Zaki Youssef, Nihal Ezzat And Heba El Asfouri,

ABSTRACT
The Aim Of The Present Study Was To Compare Between Protaper Gold, WaveOne Gold And Protaper Universal Regarding Apically Extruded Debris And Geometric Analysis Including Change In Dentin Thickness, Canal Straightening, Centering Ratio, And Canal Transportation.)

Materials and Methods: A Total Number Of 21 Distal Root Canals Were Selected And Randomly Divided Into Three Groups For Evaluation Of Apical Extrusion Of Debris Using A Modified Version Of The Experimental Model Described By Myers And Montgomery. Root Canals Were Prepared According To The Manufacturer?s Instructions Using Protaper Gold (PTG) For Group I, WaveOne Gold (WOG) For Group II And Protaper Universal (PTU) For Group III. A Total Number Of 63 Mesial Root Canals (mesio-buccal And Mesio-lingual) Were Selected And Randomly Divided Into Three Groups For Evaluation Of Geometric Analysis Using Cone Beam Computed Tomography (CBCT). Root Canals Were Prepared According To The Manufacturer?s Instructions Using Protaper Gold (PTG) For Group I, WaveOne Gold (WOG) For Group II And Protaper Universal (PTU) For Group III. Data Was Statistically Analyzed Using One-way ANOVA And Significance Level Was Set At P < 0.05.

Results: Regarding Evaluation Of Apically Extruded Debris, There Was No Statistically Significant Difference Between Protaper Gold Group And WaveOne Gold Group (P > 0.05). However, There Was Statistically Significant Difference Between Protaper Universal Group And The Other Two Groups (Protaper Gold And WaveOne Gold) (P < 0.05). Regarding Geometric Analysis, There Was No Statistically Significant Difference Between The Three Groups (P < 0.05). Conclusion: Within The Limitation Of The Present Study, It Can Be Concluded That: All The Tested Instruments Showed A Considerable Amount Of Apically Extruded Debris And Failed To Completely Preserve The Geometric Configuration Of The Root Canals.

Shimaa M. Hadwa , Amina M. El Hosary, Amal Kabbash And Ahmed Essa,

ABSTRACT

Objectives: The Present Study Was Conducted To Compare The Histopathological Effects Of Nigella Sativa Oil And Formocresol As Pulpotomy Agents In Primary Teeth.

Materials and Methods: The Present Study Was Carried Out On Twenty-six Primary Teeth That Previously Planned For Serial Extraction. Two Sound Teeth Were Used To Standardize Normal Pulp Structure And Tissue Organization. Twenty ?four Primary Teeth Were Divided Into Two Groups, (twelve Teeth For Each). Pulpotomy Procedures Were Done In Both Groups; Group I Was Treated With Nigella Sativa Oil While Group II Was Treated With Formocresol. Four Teeth From Each Group Were Extracted At (two, Four, And Twelve Week?s Intervals).

Results: Nigella Sativa Oil Showed Significantly Better Results Than Formocresol Regarding Pulp Inflammation, Soft Tissue Organization And Dentin Bridge Formation.

Conclusions: Nigella Sativa Oil Is Associated With Decreased Pulpal Inflammation And More Preservation Of The Odontoblastic Layer With Enhanced Regenerative Tendency Than Formocresol.

Ahmed Hassan Omran, Mohamed Farag Ayad And Amany Mohamed Korsel,

ABSTRACT


Purpose: Study Was Performed To Evaluate The Fracture Resistance Of Flared Root Canals Restored With Hybrid Ceramic Dowel And Core.

Materials and Methods: Two Techniques Were Used For Fabrication Of Dowel And Core. Group I (control), Casted Using Ni-Cr Metal Alloy. Group II (experimental Group), CAD/CAM Using Vita Enamic Hybrid Ceramic. 10 Specimens Were Fabricated Using Each Technique. Complete Cast Crowns Were Used To Restore All Specimens. Specimens Were Fixed In Acrylic Resin Cylinders, Then Positioned In The Mounting Device And Aligned At A 135� Angle With Respect To The Long Axis Of The Root In An Instron Testing Machine. Compressive Load Applied Palatally To All Specimens Till Fracture. Data Were Analyzed And Kolmogorov-Smirnov Test Was Used To Verify The Normality Of Distribution. Student T-test Was Used To Compare The Results Of The Tested Groups At Level Of Significance� 0.05.

Results: There Was A Significant Difference Between The Two Groups (p�0.05). The Results Revealed That Cast Dowel And Core Made From Ni-Cr Metal Alloy Had Higher Fracture Resistance (403.39 � 60.93 N) Than Dowel And Core Made From Vita Enamic Hybrid Ceramic (240.27�69.12 N). Conclusion: The Difference In Fracture Resistance Results Between The Cast Metal And The Hybrid Ceramics Dowels And Cores Were Significant. The Highest Values Recorded For The Cast Metal Group. The Two Tested Groups Showed Acceptable Fracture Resistance Values Which Can Withstand Normal Adult Occlusion Force Especially In The Anterior Teeth.

Ahmed Mostafa Mohamed Taha, Mostafa Ezz And Mostafa Algangihy,

ABSTRACT
Objective: Evaluation Of The Success Of Immediate Implantation With Closed Sinus Lift In Chronically Infected Maxillary Molar / Premolar Sockets. Patients And Methods: Ten Patients Participated In This Study (5 Males And 5 Females With A Mean Age Of 36 Years) Free Of Any Systemic Diseases That Would Affect Bone Formation, Free Of Chronic Maxillarysinusitis And Were Non-smokers. Each Patient Had At Least One Chronically Infected Maxillary Premolar / Molar Tooth Or Remaining Root With At Least 6mm Bone Height From The Maxillary Sinus Floor.

Results: The Results Showed A Mean Bone Gain Of 3.88 Mm Mesio-distally And 3.9 Mm Bucco-palatally. The Density Of The Newly Formed Bone Was 50% Of The Density Of The Adjacent Alveolar Bone Before Loading Of The Implant. The Overall Success Rate Was 90%. Conclusion: From This Study We Can Conclude That Immediate Implantation With Closed Sinus Lift In A Chronically Infected Posterior Maxillary Tooth Can Be Considered A Reliable And A Predictable Technique.