Rehab S. El-Ghazzawi, Ghada A. El-Baz, Sahar Z. El-Azab And Tarek M. Nabil,

ABSTRACT
A Mouth Wash Is A Chemotherapeutic Agent Used As An Effective Home Care Remedy To Improve Oral Hygiene And Prevent Dental Caries By Targeting The Cariogenic Bacteria. Aim : To Evaluate And Compare The Effect Of Three Mouth Washes Of Natural Aqueous Extracts Of Pomegranate, Green Tea And Rosemary On Salivary PH Changes (pH Meter), Plaque Accumulation ( Sillness And L?e Plaque Index) And Counts Of Salivary Streptococcus Mutans And Lactobaciili.

Materials and Methods: Mouthwashes Were Prepared From Aqueous Extracts Of Pomegranate, Green Tea And Rosemary . 40 Children, Aged From 4-6 Years And 12-15 Years, Were Asked To Use Mouthwashes For 4 Days .The Effect Of Mouthwashes Were Evaluated On PH Of Saliva, Plaque Accumulation Rate And The Count Of Salivary Streptococcus Mutans And Lactobacilli. The Collected Data Were Statistically Analyzed. Results; In Both Age Group, After Using Mouthwash, Green Tea Mouthwash Showed Statistically Significantly Lower Mean Value In Mean Plaque Index Score After Using Mouth Wash. Rosemary Mouthwash In Group A(aged From 4-6y) Showed The Highest Mean PH Score With Non-statistically Significant Difference From Green Tea Subgroup. The Three Herbal Mouthwashes Showed Their Significant Inhibitory Effect On Streptococcus Mutans And Lactobacilli In Both Age Groups. Conclusion: Pomegranate, Green Tea And Rosemary Mouthwashes Could Be An Appropriate And Safe Choice To Decrease Dental Caries In Children.

Ehab Magdy Shafik, Sherif Farouk El-gayar, Enas Alaa El-din Abd El-Aziz And Hanan Eid Gamal,

ABSTRACT
Aim Of Study: To Evaluate The Anticancer Potential Of Propolis On Human Laryngeal Squamous Cell Carcinoma Cell Line (Hep-2).

Materials and Methods: Prepared (Hep-2) Cell Line Was Treated With Different Concentrations Of Propolis For 24 Hours. The Effect Of Propolis On Cell Line Was Investigated Using MTT Assay, Cytological Examination And Nuclear Morphometric Analysis. The Results Were Analyzed Statistically.

Results: MTT Assay Showed That The Mean Viability Percentage Of Propolis Treated Cells (in Relation To Control Cells) Decreased As Propolis Concentration Increased From 0.275mg To 280mg. Morphometric Analysis Showed A Decrease In Nuclear Area Factor (NAF) Which Is An Indicator Of Apoptosis As Concentrations Increased. The Results Were Statistically Significant. Conclusion Propolis Has A Significant Anticancer Effect On Hep-2 Cell Line.

Eslam Said Mohamed, Ragia Mohamed Mounir, Nadia Galal Mohamedand Maha Mohamed Sallam,

ABSTRACT
Objective: To Evaluate The Effect Of Using Simvastatin On Bone Osseointegration Surrounding Dental Implants. Methodology: Twelve Implants That Were Inserted And Divied Into 2 Equal Groups, Each Group Contained Six Implants (simvastatin Group And Control Group). All Implants Were Done Using Delayed Submerged Implant Insertion Technique. Group One Received Simvastatin Powder As An Adjunctive; To Improve The Osseoientgration Of The Bone Surrounding The Dental Implants, While Group Two With No Adjunctive. All Patients Were Followed Up Clinically And Radiographically For Osseointegration Using Cone Beam CT Two Months, And Six Month Postoperatively.

Results: Simvastatin Group Showed Statistically Low Significant Increase In The Percentage Of Increase In The Mean Bone Density, When Compared To The Control Group. Moreover, It Showed Statistically Low Significant Decrease In The Bone Height Loss Than The Control Group. Conclusion: Simvastatin Powder Is A Safe, Efficient And Easy Way For Mild Acceleration Of Bone Healing And Osseointegration Surrounding Titanium Dental Implants. The Simvastatin Drug Has The Main Function As Antihypercholaesterlemia Drug In Addition To Its Ostegeonic Effect On Bone.

Amal Abu El- Hassan Mohamed, Mahmoud Hamdy Eid And Nada Mohamed Wassef,

ABSTRACT
Sealants Form A Physical Barrier Between The Oral Environment And Deep Fissures That Contribute To Caries Prevention. It Is Postulated That Sealants Possessing Antibacterial Properties Are Advantageous.

Aim: Study The Bacterial Inhibitory Effect Of Two Fluoride Releasing Fissure Sealants (Teethmate F-Kuraray, Fissurit F- Voco) On The Inhibition Of Streptococcus Mutans And Lactobacillus Acidophilus.

Materials and Methods: The Strains Of Streptococcus Mutans And Lactobacillus Acidophilus Were Grown In The Brain Heart Infusion Broth Then Incubated For 18 Hr At 37?C And Subcultured In Selective Agar. The Zone Of Inibition Was Measured In Mm.

Results: Teethmate F-1 Showed More Antibacterial Property Against Streptococcus Mutans Than Fissurit F And There Was No Statistically Significant Difference Between Teethmate F-1 And Fissurit F Against Lactobacillus Acidophilus.

Conclusions: Within The Limitations Of This In-vitro Study, It Can Be Concluded That Both Materials Are Capable Of Contact Inhibition Of Streptococcus Mutans And Lactobacillus Acidophilus Growth.

Samia Mostafa Kamal, Rehab A. Abdel Moneim And Aml Mostafa Kamal,

ABSTRACT
Background: Human Eruption Is A Unique Developmental Process In The Organism. The Etiology Or The Mechanism Behind Eruption Has Never Been Fully Understood. Accordingly, The Mechanism Of Eruption Depends On The Correlation Between Space In The Eruption Course Created By The Crown Follicle, Eruption Pressure Triggered By Innervation In The Apical Root Membrane And The Ability Of The Periodontal Ligament To Adapt To Eruptive Movements.

Aim: This Study Was Designed To Localize And Delineate The Role Of The Signaling Molecule; Transforming Growth Factor Beta (TGF-?) Before, During And After Eruption.

Materials and Methods: The Study Was Carried Out On Twenty Adult Albino Rats (6-8 Months Old) And Of Average Weight 200-250 Gm. The Rats Were Housed Together For Mating. After Pregnancy Confirmation, The Off- Springs Were: Sacrificed At Birth (Group I), 5 Days Postpartum (Group II), 10 Days Postpartum (Group III) And 15 Days Postpartum (Group IV). Each Group Consisted Of Ten Off-springs. The Lower Jaws Of All Off-springs Were Then Dissected, Processed And Mounted In Paraffin Wax For Histological Examination, Immunohistochemical Assessment And Statistical Analysis.

Results: Immunohistochemical Investigation Showed That TGF-? Was Widely And Deeply Expressed In Tooth Follicle And Bone Trabeculae At The Base Of The Growing Tooth At All Developmental Ages And Was Significantly Increased At 15 Days Postpartum With Statistical Significance; P<0.0001. Conclusion: Although The Exact Mechanisms Of Eruption Are Not Yet Known, We Proposed A Close Relation Between Signaling Molecules And Eruption Process Based Upon Our Findings And The Apparent Effects Of TGF-? On Odontogenesis And On The Whole Eruption Process.

Nermeen Ahmed Hassan, Amr Hosni El-Khadem And Maha Wagdy El-Kerdawy ,

ABSTRACT
Background: Titanium Has Been Used Considered The Gold Standard For Dental Implants For Many Years Due To Its Superior Mechanical Properties. However, It Has Many Drawbacks Regarding Corrosion And Esthetics That Required Searching For Another Alternative. In This Study, We Aimed To Determine The Amount Of Stresses Developing In The Peri-implant Bone Under Vertical Load When Different Types Of PEEK Are Used As An Implant Material.

Materials and Methods: Four Virtual Models Of A Mandible With Two Inter-foraminal Implants Supporting An Overdenture Were Designed Using SolidWorks Software. Unilateral Vertical Load Was Applied Over The Denture Teeth And Von Misses Stresses Were Collected From The Peri-implant Bone.

Results: Von Mises Stresses In The Coronal Portion Of The Peri-implant Bone Was The Highest Around PEEK Implants And The Least Around Titanium Implants. Conclusion: PEEK Can Be Used As An Alternative To Titanium In Dental Implants From The Mechanical Point Of View, But Further Clinical Studies Are Recommended To Test The Material Behavior Intraorally.

Mennat-Allah Sayed Gaber, Shaymaa I. Habib And Abdel-Hadi Mohamed Amin,

ABSTRACT


Purpose: The Aim Of This Study Was To Evaluate Solubility, Calcium And Phosphorus Ions Release And Bioactivity Of Resin Modified Glass Ionomer Cement Before And After Addition Of Nanobioactive Glass Particles.

Materials and Methods: One Commercially Available Resin Modified Glass Ionomer Cement And Nanobioactive Glass Particles Were Used In This Study. Bioactive Glass Was Added To The Cement Powder By Two Weight Percentages 2wt% And 5wt%. Solubility Was Evaluated Using ANSI/ADA Specification No.66-1989 For Glass Ionomer Cements. Twenty One Samples (n=7/gp) Were Prepared Using Split Teflon Mold (7.75?1.5mm). Solubility Was Recorded At 7 Days And 30 Days. For Calcium And Phosphorus Ions Release, 21 Samples (n=7/gp) Were Prepared Using The Same Mold And Stored In Deionized Water Then Recorded At 7 Days And 30 Days. Regarding Bioactivity ,12 Samples (n=4/gp) Were Prepared And Immersed In PBS Solution For 7 Days And 30 Days And Examined By Scanning Electron Microscope (Field Emission Gun) Attached With Energy Dispersive X-ray Analysis Unit EDXA. The Results Were Statistically Analyzed.

Results: Regarding Solubility, Results Showed A Statistically Significant Difference Between Group I, Group II And Group III After Both 7 Days And 30 Days. Moreover, Storage For 30 Days Showed Statistically Higher Solubility Values In All Groups Than 7 Days. Regarding Calcium Ions Release, There Was A Statistically Significant Difference Between Group I, Group II And Group III After Both 7 Days And 30 Days. However, No Statistically Significant Difference Was Recorded Between 7days And 30 Days In All Groups. For Phosphorus Ions Release, It Was Found That There Was A Statistically Significant Difference Between Group I, Group II And Group III After 7 Days. However, After 30 Days There Was No Statistically Significant Difference Between Group I, Group II And Group III. Results Also Showed Statistically Significant Higher Ph Ions Release After 30 Days Than 7 Days. Regarding Bioactivity, CaP Deposits Were Obvious Only In High Concentrations Of BAG (group III) After 30 Days Immersion In PBS On The Surface Of The Samples With Ca/P Molar Ratio =1.3.

Conclusions: 1. There Is A Direct Relationship Between The Amount Of BAG Added To RMGI And Its Solubility. 2. Although Addition Of BAG To RMGI Increased The Ion Bioavailability And Solubility, The Bioactivity Was Not Sufficiently Improved.

Mohamed S. Elbehairy, Nora Cheta, Tamer M. Nassef And Hamdy A. Hamed,

ABSTRACT
Background Comparing The Effect Of Implant Inclination On Stress Distribution In Peri-implant Bone In Mandibular All On Four Hybrid Prosthesis. Material And Methods Bone Model Was Reconstructed From CBCT Scan Segmentation, Implants And Cad/cam Prosthesis Were Exported As STL Files And Converted Into Solid Parts By Reverse Engineering Followed By Part Assembly, Meshing And Load Application. Results A Large Decrease In Von-mises Stresses Was Observed In The Model With 30 Degrees Tilted Implants. Conclusion Model D30 Was The Best Treatment Design Regarding Stress Distribution Compared To The Other Two Models.

Osama S. Selim, Jihan F. Younis And Tamer A. Hamza,

ABSTRACT
Statement Of Problem: The Mechanical Properties Of Recently Introduced Zirconia Reinforced Lithium Silicate Materials As Full Anatomical Restorations Require More Evaluation. The Lack Of Documentation Studying The Effect Of Different Finish Line Curvatures On The Mechanical Behaviour Of Ceramics Necessitated Investigation. The Purpose Of This In-vitro Study Is To Compare The Fracture Resistance Of Recently Introduced Zirconia Reinforced Lithium Silicate To Lithium Disilicate Using Two Different Finish Line Curvatures.

Materials and Methods: Twenty-eight Crowns Were Milled And Fabricated Using CAD/CAM System On Epoxy Dies Duplicated From A Stainless-steel Master Die. They Were Divided Into 2 Equal Groups (n = 14) According To The Ceramic Material Type Used: Group I, Monolithic Lithium Disilicate (IPS E.maxCAD) And Group S, Monolithic Zirconia-reinforced Lithium Silicate (Vita Suprinity). According To The Finish Line Curvature; Zero And 3mm Curve, Each Group Were Subdivided Into Two Equal Subgroups (n=7). All Specimens Were Cemented On Epoxy Dies Using A Self-adhesive Resin Cement (TOTALCEM, Itena), And Then Loaded Until Fracture Using A Universal Testing Machine. Kruskal-Wallis Test Was Used To Compare Between The Two Ceramic Types. Mann-Whitney U Test Was Used To Compare Between The Two Finish Line Curvatures. The Significance Level Was Set At P ? 0.05. Hypothesis: The Two Different Finish Line Curvatures Will Affect The Fracture Resistance Of The Tested Monolithic Crowns

Results: With Both Ceramic Types, There Was No Statistically Significant Difference Between Mean Fracture Resistance Values Of The Two Finish Line Curvatures. IPS E.maxCAD Showed The Statistically Significantly Higher Mean Fracture Resistance Than Vita Suprinity. Conclusion: The Finish Line Curvature Had No Effect On The Fracture Resistance Of The Tested Ceramic Restorations. The Strength Of Tested Ceramic Is A Material Dependant Where IPS E.maxCAD Crowns Showed Higher Fracture Resistance Mean Values Than Vita Suprinity

Rana Abdel Hameed El Gazar, Mohamad Seddik Mohamad Kamel And Eman Fahmy Ado Elfetoh,

ABSTRACT
Background: Tooth Bleaching Has Become Popular In Dentistry Since It Has Been Shown To Be An Effective And Noninvasive Treatment. The Bleaching Agent Is Applied In Intimate Contact With The Teeth, With Potentially Associated Restorations, It Has Been Speculated That This Process Could Cause Negative Alterations In Oral Substrates

Purpose: To Evaluate In-office Light-activated Bleaching On Translucency Of Hybrid Ceramic By Measuring Transmittance And Absorption Of Light By Spectrophotometer.

Materials and Methods: Twenty Specimens Were Prepared In (3M2-T) Shade And Were Cut From CAD/CAM Blocks Of Hybrid Ceramic. The Study Will Consist Of Twenty Specimens Of Hybrid Ceramic And These Specimens Will Be Randomly Divided Into 2 Groups. The Translucency Of The Samples Of Group I Act As A Controlled Group Which Were Not Received32% Hydrogen Peroxide Bleaching Agent Was Measured By Spectrophotometer. Samples Of Group II Received 3 Times Applications Of The Bleaching Agent. Each Cycle Ranges 15-20 Min. Then Exposed To A LED Power Bleach System For Three Cycles ? 15 Min Each With 10 Min Resting Time. New Translucency Evaluation By The Spectrophotometry In The Same Way For Samples Of Group II.

Results: In This Study, A Comparison Of The Groups Using Independent T-test Revealed Statistically Significant Differences In Translucency Values Before And After Bleaching (P<0.001). After Bleaching, We Can Observe A Decrease In The Absorption Of Light. Also, There Was An Increase In Transmittance Of Light In Group II Samples When Compared With Samples Of Group I. This Is Proved That Bleaching Caused A Highly Significant Change In Translucency Values Of Hybrid Ceramic. Conclusion: In Conclusion, Statistically Significant Differences Among The Translucency Changes Of All Test Groups Were Found After Exposing Them To The Bleaching Agent.