Sara Mohamed Zaki El.Din Hefny, Sherine Ezz El Din Taha And Soad Abdelmoniem Abdelmoniem,

ABSTRACT


Introduction: Prediction Of The Mesio-distal Dimensions Of Unerupted Permanent Canines And Premolars During The Mixed Dentition Allows The Dentist To Better Manage Tooth Size/arch Length Discrepancies.1

Aim: To Determine The Combined Mesio-distal Widths Of The Permanent Mandibular Incisors And That Of The Maxillary And Mandibular Canine And Premolars In A Group Of Egyptian Children In Alexandria Governorate And To Correlate Between The Widths Of These Teeth To Formulate Normative Data For The Egyptian Children.

Materials and Methods: This Study Conducted On 200 Egyptian Children With An Age Range From 12 To 15 Years Selected Randomly From Three Different Hospitals In Alexandria Governorate. Upper And Lower Impressions Were Taken. Each Impression Was Poured Immediately By Dental Stone. Mesio-distal Widths Of Mandibular Incisors And Maxillary And Mandibular Canines And Premolars Were Measured From The Study Models Using An Electronic Digital Caliper. Data Were Collected And Statistically Analyzed.

Results: There Was Statistically Significant Difference Between Boys And Girls For The Mesio-distal Width Of All Mandibular And Maxillary Teeth. No Statistically Significant Difference Between The Mean Mesio-distal Widths Of The Teeth On Right And Left Sides For Boys And Girls. There Was Positive Significant Correlations Found Between The Mesio-distal Widths Of Upper/lower Canine And Premolars With The Lower Incisors In Right And Left Sides For Boys And Girls. A New Prediction Equations Were Concluded And Proposed From The Results Of This Study Sample. Conclusion: Due To Sexual Dimorphism Found In This Study Sample, The Mesio-distal Teeth Widths Should Be Measured Separately In Boys And Girls. No Teeth Size Discrepancy Between Right And Left Sides In Boys And Girls. So, If Teeth On One Side Are Missing, The Measurements Of Teeth In The Other Side Can Be Used Interchangeably To Represent The Missing Teeth. Due To The Positive Correlation Found Between Mesio-distal Widths Of Upper And Lower Canines And Premolars And Lower Incisors So, We Can Predict The Mesio-distal Width Of Unerupted Canines And Premolars By Measuring The Early Erupting Lower Incisors.

Walaa M Abd El Latif, Saied M Abd El Aziz And Reham M Seyam,

ABSTRACT
The Purpose Of This Randomized, Double-blind, Controlled Study Was To Assess The Effect Of Addition Of Amoxicillin To AH Plus In Single Visit Endodontics On Post Endodontic Flare Up In Asymptomatic Necrotic Teeth. Forty-six Patients Were Randomized And Allocated To Experimental And Control Groups Where Amoxicillin Was Added To AH Plus In The Experimental Group While AH Plus Had Been Used Alone In The Control Group. Flare Up Was Considered As Moderate-to-severe Postoperative Pain And/or Moderate To Severe Swelling That Began 12 To 48 Hours After Treatment And Lasted At Least 48 Hours. The Results Demonstrated That 2.3% Of The 46 Patients Had A Flare-up. Of The Five Patients Who Had Flare-ups, 2 Were In The Amoxicillin Group And 3 Were Not. There Was No Statistically Significant Difference Between Both Groups (P=1.000). We Concluded That The Addition Of Amoxicillin To AH Plus Had No Effect On Flare-up In Asymptomatic Necrotic Teeth.

Maie Hamdy Elakkad; Manal Mostafa ElAssaly And Heba Mohamed Hakam,

ABSTRACT
This Research Was Designed To Compare The Efficacy Of Local Irrigation Of Simvastatin (SIM) In The Relief Of The Symptoms Accompanying Pericoronitis Versus Normal Saline Solution.

Materials & Methods: 30 Male Volunteers, Age 18-28 Years Old Suffering From Pericoronitis Were Divided Into 3 Groups 10 Volunteers Each: Group 1 (Control): Where Immediate Operculectomy Was Done, Group 2 (experimental): Who Received Normal Saline Solution Irrigation & Group 3 (experimental): Received Irrigation Of Prepared SIM Solution. Operculectomy Was Performed On The 2nd And 4th Days Post Irrigation For 5 Volunteers Each Time In Both Groups 2 & 3. Excised Opercula Were Examined Both Histologically & Immunohistochemically For Localization Of TNF-� & BMP-2.

Results: Histological Examination Revealed That Both Normal Saline And Simvastatin Solution Improved The Histological Signs Of Inflammation With Superior Results Of The Later. The Highest Mean Value Of TNF-� Was Found In Group 1 (control) (38.98 � 7.60) While The Least Mean Value Of TNF-� Was Found In Group 3 (experimental) (3.15 � 1.34) After 4 Days Of Simvastatin Irrigation. The Highest Mean Value Of BMP-2 Was Found In Group 3 (experimental ) (31.95 � 7.61) After 4 Days Of Simvastatin Irrigation While The Least Mean Value Of BMP-2 Was Found In Group 1 (control) (9.26 � 1.72). Conclusion: Irrigation Using Simvastatin Solution Was More Effective Than Normal Saline On Both Histological& Immunohistochemical Levels.

Ahmed Alsaid Othman, Rabab Mubarak And Marwa Sameer Moussa,

ABSTRACT
Background: Stem Cells From Human Exfoliated Deciduous Teeth (SHED) Are Considered One Of The Simplest; The Most Convenient Source Of Adult Stem Cells. The Study Aimed To Examine The Proliferative Effect Of Fibroblast Growth Factor 6 (FGF-6) On SHED And On CDK2 And MATEK Derived Microvesicles Genes Expression. Methods: SHED Was Cultured From Deciduous Teeth Pulp. SHED Were Divided Into Two Groups; Control Group And Test Group Without And With FGF-6 Supplementation Respectively. At The Third Passage, SHED Proliferation Was Assessed By MTT Assay. MVs Were Purified And CDK2 And MATK Genes Expression Were Assessed By Real Time Polymerase Chain Reaction.

Results: SHED Were Identified By Their Positivity For CD90 And CD73 And Negativity For CD 45 And CD 34. SHED Proliferation In The Test Group Was Significant In Comparison To Control Group (P < 0.001). SHED Derived MVs? MRNA From The Test Group Demonstrated A Remarkable Elevated Expression Of CDK2 And MAKT, (P< 0.002) (P< 0.005) Respectively In Comparison With Those Of The Control Group. Conclusion: FGF-6 Enhances Proliferation Of SHED. It Is Favorable For The Production Of Large Number Of Stem Cells Which Is Beneficial To Cell Based Therapies. SHED Derived MVs CDK2 And MAKT Can Be Used As Molecular Biomarkers For SHED Proliferation.

Rehab Ali Farag, Maged M. Negm, Magdy M. Ali And Lamia I. Ahmed,

ABSTRACT


Aim: To Evaluate The Effect Of Adding White Portland Cement, In The Ratio Of 25% By Weight, On The Physical Properties Of MTA Fillapex. Methodology: White Portland Cement (WPC) Powder Was Incorporated Into The Paste Of Mixed MTA Fillapex In The Ratio Of 25% By Weight. Different Properties Including Powder-paste Ratio, Strength Properties, Setting Time, Film Thickness, Water Solubility, And Push Out Bond Strength Were Studied In Comparison To MTA Fillapex.

Results: The Experimental Material Showed Higher Setting Time, Higher Film Thickness, Higher Solubility, Higher Diametral Tensile Strength, And Higher Compressive Strength, Though The Last One Was Not Statistically Significant. On The Other Hand, The Push Out Bond Strength Of The Experimental Material Was Significantly Lower.

Conclusions: Addition Of Portland Cement To MTA Fillapex Increases Its Setting Time, Film Thickness, Solubility, Diametral Tensile Strength And Compressive Strength. However, Its Push-out Bond Strength Decreased.

Norhan Ali Abdel-Halim, Maha Eshak Amer And Nasr Mohamed M. Osman,

ABSTRACT


Purpose: Assessment Of Cervical Lymph Nodes In Young Adults By Ultrasonography. Subject And Methods: The Neck Examined By Ultrasound In 25 Healthy Subjects, 2.3_40 Years Old. The Ultrasonographic Features Of Lymph Nodes As Long Axis Dimension, Short Axis Dimension, Shape, Short -to- Long Axis Diameter (S/L), Presence Of Fatty Hilum, Nodal Borders Were Documented. In Addition Relation Between Age And Gender Were Investigated.

Results: In Cervical Lymph Nodes A Decrease In Short Axis Diameter Was Statistically Significantly Associated With Aging (p=0.02), And 100 % Of Cases Were Oval In Shape And 56% With S/L Ratio �0.5 And 44% With S/L Ratio >0.5. 100 % Of Cases Were With A Preserved Central Fatty Hilum. 100% Of Cases Were With A Smooth Outline. 100% Of Cases Were Hypoechoic With A Hyperechoic Central Fatty Hilum. The Mean Average Size Of Normal Cervical Lymph Nodes Were 0.8 Cm (8mm). The Maximal Short Dimension Was 8 Mm Or Less.

Conclusions: Ultrasonography Is A Useful Non-invasive, Non-ionizing Imaging Tool For The Initial Investigation Of Cervical Lymph Nodes. It Provides An Accurate Imaging For Head And Neck And Provides Useful Information Of Lymph Nodes As Shape, Size, Nodal Borders, Presence Of Fatty Hilum.

Mostafa Elhussieny Mohammed Ismail And Cherif Adel Mohsen,

ABSTRACT
This Study Was Carried Out To Evaluate And Compare The Vertical Marginal Gap Distance,and Cyclic Loading Of All-ceramic Crowns Vita Suprinity And IPs E.max CAD (CAD/CAM Milling, Cerec MCXL), Using Two Types Of Finish Lines (deep Chamfer And Radial Shoulder). Specially Designed Stainless Steel Dies Were Constructed And A Total Number Of 40 Samples Were Constructed Representing Two Equal Groups (20 Samples), According To The Type Of Materials (VITA Suprinity And IPs E.max CAD ?CAD/CAM Milling Technique Cerec MCXL) The Twenty Samples Were Further Divided Into Two Divisions (10 Each) According To The Type Of The Finish Line Used (deep Chamfer And Radial Shoulder). Each Division Was Then Divided Into Two Classes (5 Each) (one Class Was Constructed As A Crown Coping And Then Veneered, The Second One Was Constructed As A Full Contoured Crowns). Vita Suprinity And IPs E.max CAD Crowns Were Fabricated Following A Standard Procedure And Standard Dimensions As Controlled By The Cerec MCXL Software. As Regard The Vertical Marginal Gap Test, The Results Showed That IPs E.max CAD Crowns Regardless To Finish Line Type And Veneering, Recorded A Higher Vertical Marginal Gap Mean Value (42.59�2.38 �m) Than Obtained With Vita Suprinity Crowns (36.11�1.76�m). Regardless To The Production Techniques And Veneering, Deep Chamfer Finish Line Recorded A Lower Vertical Marginal Gap Mean Value (37.94�2.11�m) Than Obtained With Radial Shoulder Finish Line (40.77�2.33�m). Regardless To Production Techniques And Finish Lines, Full Contoured Crowns Recorded A Lower Vertical Marginal Gap Mean Value (38.34�2.36�m) Than Obtained Veneering (40.36�2.10�m). The Cyclic Loading Test Data Revealed That IPs E.max CAD Crowns Recorded A Higher Fracture Resistance Mean Value (1013�53.84N) Than The Load Cycled Crowns (888.1�104.4N). Vita Suprinity Crowns Recorded A Higher Fracture Resistance Mean Value (803.7�66.45N) Than The Load Cycled Crowns (703.8�34.26N), Regardless To Finish Line Type And Veneering. The Cyclic Loading Test Data Revealed That IPs E.max CAD Crowns Recorded A Higher Fracture Resistance Mean Value (1013�53.84N) Than The Load Cycled Crowns (888.1�104.4N). Vita Suprinity Crowns Recorded A Higher Fracture Resistance Mean Value (803.7�66.45N) Than The Load Cycled Crowns (703.8�34.26N), Regardless To Finish Line Type And Veneering.

Heba M. A. Darwish, Mostafa A. M. Hassan, Eman A. Abou Auf And Reham A.F.Dwedar,

ABSTRACT
The Present Investigation Was Conducted To Assess And Compare The Antimicrobial Effect Of Five Traditional Plant Extracts (green Tea, Guava Leaves, Coffee, Clove And Ginger) Against Common Cariogenic Microorganisms. The Samples Of The Study Were Divided Into Two Main Groups Of 125 Filter Paper Discs Each, According To The Type Of The Inoculated Bacteria; B1: Streptococcus Mutans Group And B2: Lactobacillus Acidophilus Group. Then Each Group Was Further Subdivided Into Five Equal Subgroups Of 25 Discs Each, According To The Type Of Plant Extract Tested. The Cultivation Of The Plant Extracts Discs On The Culture Media Was Done Using The ?disc Diffusion Method?. The Antibacterial Behavior Of Each Plant Extract Was Assessed By Measuring The Diameter Of The Inhibition Zones By Millimeters In Comparison To The Positive Control (antibiotic Disc) And Negative Control (distilled Water Disc). The Results Showed That The Only Potent Antibacterial Plant Extracts Against Streptococcus Mutans And Lactobacillus Acidophilus Were Green Tea And Ginger. Guava And Clove Extracts Showed Antibacterial Effect On The Streptococcus Mutans Only, While Coffee Extract Showed Antimicrobial Effect Against Lactobacillus Acidophilus Only.

Islam Moftah, Enas Fathelbab And Mohammed M. Shalaby,

ABSTRACT

Objectives: The Aim Of The Study Was To Investigate The Influence Of Thermocycling On Shear Bond Strength Of Two CAD-CAM Fabricated Materials Luted To Teeth With Different Luting Agents. Methods: Thirty Six Freshly Extracted Sound Human Upper Six Molars Were Collected And Placed Into Color Coded Acrylic Molds. Occlusal Surfaces Of Teeth Were Reduced To Expose Dentin Then Flattened. Thirty Six Discs With 10mm Diameter And 1.5mm Thickness Were Milled Via CAD/CAM; Eighteen Of Vita Enamic And Eighteen Of Bio Hpp. Each Group Was Divided Into Three Subgroups According To The Used Luting Agent (six Samples Each). Subgroups (A1&B1) Luted By Vario-link, (A2&B2); Luted By Panavia And (A3&B3) Luted By Rely-X. All Samples Were Cemented Under Constant Static Load And Thermocycled 5000 Cycles Then Shear Bond Strength Was Tested. Data Were Collected, Tabulated And Statistically Analyzed Using SPSS. Failure Modes Were Evaluated Using SEM. For Parametric Data; One-way (ANOVA) Was Used To Analyze The Data, Followed By Scheffe?s Post-hoc. The Significance Level Was Set At P � 0.05.

Results: Statistical Analysis Revealed That There Is A Statistical Significant Difference Between Both Tested Materials At P Value 0.05. One Way Anova Revealed That There Was Statistical Significant Difference Between Mean Values Of SBS Of The Bio Hpp And Vita Enamic Among The Six Tested Sub Groups At 0.05 Level.Scheffe?spost-hoc Test Showed That Veriolink Luted Samples Of Both Tested Materials (VA& VB) Recorded The Highest Mean Values Of SBS. There Was No Statistical Significant Difference Between Subgroup (PB & RB). However There Was Statistical Significant Difference Between Mean Values Of SBS Of Both Subgroups To Those Of Subgroups (VA, PA& RA). All Tested Vita Enamic Subgroups Showed Mixed Mode Of Failure. Whereas, All Tested Bio Hpp Subgroups Showed Adhesive Failure Mode. Conclusion: Total Etch And Bond Resin Cements Yield The Highest Shear Bond Strength When Bonded To Bio Hpp And Vita Enamic, Self-etch Resin Cements Yield Low Shear Bond Strength When Bonded To Vita Enamic, While Self-adhesive Resin Cements Yield Low Shear Bond Strength When Bonded To Bio Hpp.

Noura M. El-Sherif And Enas Fathelbab,

ABSTRACT

Objectives: The Aim Of This Study Was To Find Out The Effect Of Home And Office Bleaching Agents On Color And Surface Roughness Of Different Thicknesses Of Hybrid Resin Ceramics. Methods: Forty Disc Shaped Samples (1 & 1.5mm Thick) Were Fabricated From Vita Enamic Shade (3M2-HT) And Lava Ultimate Shade (A3-HT) Hybrid Ceramics (20 Sample Each). Samples Of Each Subgroup Were Divided Into Two Classes According To The Used Bleaching Technique; (home And Office) (5 Samples Each). Surface Roughness Of All Samples Was Measured Before And After Treatment With Bleaching Agents Using A Tactile Profilometer. Color Measurements Were Done Using A Spectrophotometer For All The Samples Before And After Treatment With Bleaching Agents. Three-way (ANOVA) Was Used To Analyze The Data, Followed By Bonferroni?s Post-hoc Test. The Significance Level Was Set At P � 0.05.

Results: The ?E Values Of The Tested Materials Were Affected By Bleaching Technique And The Ceramic Thickness. The Mean Values Of (?E) For 1 Mm Thick Samples Were Higher Than Those Of 1.5 Mm Thick. The Mean Values Of (?E) For Home Bleaching Technique Samples Were Lower Than Those Treated With Office Bleaching Technique. All Samples Showed An Increase In Surface Roughness (Ra) Values After The Used Bleaching Techniques. Conclusion: Home And Office Bleaching Techniques Recorded Clinically Imperceptible Color Changes. Home Bleaching System Affected Surface Roughness Of Both Tested Materials.