MICROBIOLOGICAL COMPARATIVE STUDY BETWEEN SINGLE MAXILLARY DENTURE FABRICATED FROM RAPID HEAT CURE ACRYLIC RESIN MATERIAL AND CONVENTIONAL ACRYLIC RESIN MATERIAL MODIFIED BY TITANIUM DIOXIDE NANOPARTICLES. A RANDOMIZED CLINICAL TRIAL

Mohamed. M. El-Hwary , Nadia. A. Abbas , Mohamed. F. Abdulla And Marwa K. Mohamed,

ABSTRACT
Aim Of The Study: In Vivo Study Is Conducted To Assess The Degree Of Bacterial Colonization On Maxillary Single Dentures Fabricated From Two Different Denture Base Materials, One Of Them Fabricated From Rapid Heat Cured Acrylic Resin And The Other Modified With Titanium Dioxide Nanoparticles.

Materials and Methods: Fourteen Patients With Completely Edentulous Maxilla Were Randomly Selected According To Inclusion And Exclusion Criteria, Preliminary Impressions Were Made Using Irreversible Hydrocolloid Material, Secondary Impressions Were Made Using Green Stick Compound And Zinc Oxide/eugenol Then The Master Casts Were Duplicated Using Duplicating Silicone, Both Dentures Were Processed In Boiling Water For 20 Minutes, Each Patient Received Two Dentures Made Of Rapid Heat Cured Acrylic Denture Base And Modified Rapid Heat Cured Acrylic Denture Base With Titanium Dioxide Nanoparticles Then Bacterial Samples Were Taken From Fitting Surface Of Dentures And Oral Mucosa Using Sterile Cotton Swabs.

Results: Showed A Statistical Significant Difference In Aerobic And Anaerobic Bacterial Counts Between The Two Types Of Denture Base Materials Where The Highest Mean Value Of Bacterial Count Was Found In The Non Modified Rapid Heat Cured Dentures. It Was Concluded That Addition Of Titanium Dioxide Nanoparticles Will Decrease Bacterial Colonization On Dentures.

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EFFECT OF TWO DIFFERENT STUD ATTACHMENTS ON THE RETENTION OF UNILATERAL TOTAL MAXILLECTOMY OBTURATOR (INVITRO STUDY)

Arwa Sedky Abd El Lateef, Maha Wagdy ElKerdawy And Khaled Aziz Mohamed Abd El Wahab.,

ABSTRACT
Aim Of This Study: This Study Was Done To Investigate The Influence Of Ball And Locator Attachment Systems Retaining An Obturator Restoring Unilateral Total Maxillectomy On The Retentive Forces During Obturator Dislodgement. Materials And Methods:This Study Was Carried Out On An Acrylic Resin Model Constructed From Duplication Of A Study Model Of Unilateral Total Maxillectomy. Three Dummy Implants 3.7 In Diameter And 11 Mm In Length Were Installed At The Sites Of First Central Incisor, First Premolar And Second Molar Of The Non-defect Side. The Test Obturator Was Processed. The Experiment Was Divided Into 2 Phases: First With Ball And Socket Attachment Followed By Locator Attachment. Universal Testing Machine Was Used To Measure The Retentive Forces Of The Studied Attachments. Once Retention Measurments Were Completed For The Ball Attachments, They Were Replaced By Locator Attachment. The Collected Data Were Tabulated And Statistically Analyzed.

Results:The Results Showed That; Locator Attachments Had Statistically Significant Higher Mean Retention Values Than Ball And Socket Attachment.

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MICROHARDNESS AND SURFACE ROUGHNESS OF DEMINERALIZED ENAMEL TREATED WITH ICON RESIN INFILTRATION OR HYDROXYAPATITE REMINERALIZATION AND THEIR COMBINATION VERSUS SOUND ENAMEL AFTER TWO WEEKS PH CYCLE: AN IN-VITRO STUDY

Somayia Ramadan Mohamed, Mohamed Adel Ezzat And Maha Abdel-Salam El-Baz,

ABSTRACT

Objectives: To Evaluate The Effect Of Resin Infiltration, Remineralization Or Their Combination On Microhardness And Surface Roughness Of White Spot Lesion After PH Cycle For 2 Weeks.

Materials and Methods: Thirty Five Sound Extracted Premolar Human Teeth Were Used, The Teeth Were Sectioned Into 2 Halves. Finally 69 Teeth Halves Were Randomly Divided Into 3 Main Equal Groups In Which 23 Specimen In Each One. According To The Treatment Method (A), Where A1 Representing Sealing Using Icon Resin Seal, A2 Representing Remineralization Using Nano-hydroxyapatite Paste (Nano-HAP) And A3 Representing Remineralization Followed By Seal. Each Group Was Divided Into Two Subgroups (B) According To PH Cycle Application Where B1 Represent Immediately After Treatment Without PH Cycle Application And B2 Represent Application Of PH Cycle For 2 Weeks. Surface Micro-hardness Of The Specimens Was Determined Using Digital Display Vickers Micro-hardness Tester. Quantitative Characterization Of Surface Topography Without Contact Was Determined Using USB Digital Microscope With A Built-in Camera. One Way- ANOVA Test Used To Compare Between Treatment Materials. The Significance Level Was Set At P � 0.05. Statistical Analysis Was Performed With IBM? SPSS? (SPSS Inc., IBM Corporation, NY, USA) Statistics Version 22 For Windows.

Results: The Combination Group (Nano-HAP+Icon) Recorded The Highest Values Immediately In Microhardness And The Smoothest Surface Over Other Groups Immediately And After PH Cycling. Conclusion: The Combination Between Nano-HAP Remineralization And Resin Seal Gave Better Results In Surface Roughness And Microhardness Improvement Than Icon Alone Or Nano-HAP Alone But In Case Of Microhardness It Can Not Sustain In Front Of The Acidic Challenge.

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PRIMARY IMPLANT STABILITY IN AUGMENTED ANTERIOR MAXILLA USING SEGMENTAL INLAY GRAFTING TECHNIQUE

Mona Samy Elhadidy, Ahmed Barakat, Mohamed Monier And Adel Abou Elfetouh,

ABSTRACT

Objectives: The Aim Of This Paper Is To Estimate The Primary Implant Stability In Augmented Anterior Maxilla Using Palatal Approach Inlay Grafting. Patients And Methods: Nine Patients Were Selected. All Patients Underwent Palatal Approach Utilizing Segmental Osteotomy For The Bone Of The Anterior Maxilla And Insertion Of Alloplastic Bone Block As Grafting Material. Four Months Later The Bone Gain Was Measured And Compared And Implant Insertion Was Done. The Implant Primary Stability Was Measured Using Osstell.

Results: There Was Adequate Primary Implant Stability In All Augmented Regions . Conclusion: Segmental Sandwich Osteotomy Technique Is An Effective Technique For Augmentation Of The Anterior Maxilla. The Grafted Alveolar Ridge Provided Adequate Primary Implant Stability.

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IN VITRO COMPARATIVE STUDY OF SEATING FORCE, RETENTION AND FATIGUE WEAR RESISTANCE OF TWO ATTACHMENT SYSTEMS RETAINED MANDIBULAR-IMPLANT OVERDENTURES

Dalia Attia Ahmed Abdou , Ibrahim Ramadan Eltorky And Saied Muhammed Abdullah,

ABSTRACT
Objective: The Objective Of The Present Study Was To Evaluate The Seating, Retentive Forces And Fatigue Wear Resistance Of Two Attachments (Ball & Socket And Bar & Clip) In A Mandibular Implant Overdenture.

Materials and Methods: Two Groups Were Prepared (A, B); Each Group Contain 5 Specimen, Each Specimen Consisted Of Two Epoxy Resin Blocks Resembling The Mandibular Arch And Overdenture Base. Two Parallel Implant Fixtures 22 Mm Apart Were Embedded In One Of The Blocks With The Male Part Of The Attachments, While In The Other Block The Female Part For Each Attachment System Was Assembled. A Universal Testing Machine Was Used To Measure The Seating And Retentive Forces Of The Attachments Over The Cycles Applied.

Results: The Seating Force Of The Ball & Socket Recorded (16.03055 N) While The Bar & Clip Recorded (2.46741 N) At 10,000 Cycles, Also There Was Gradual Decrease In The Seating Forces Of Both Attachment Systems. The Ball & Socket Attachments Registered The Highest Initial Retention Value (72.53403 N) Followed By The Bar & Clip Attachments (3.940074 N). There Was Gradual Decrease In The Retentive Forces In The Ball & Socket (24.89841 N) And Bar & Clip Attachments (1.267216 N) After 5500 Cycles. Conclusion: The Retentive Properties Of Ball & Socket Attachments Exceeded The Bar & Clip Attachments, The Seating And Retentive Forces Gradually Decreased Over Time For Both The Evaluated Attachment Systems.

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COMPARATIVE STUDY OF THE EFFECT OF GARLIC EXTRACT MOUTHWASH AND CHLORHEXIDINE MOUTHWASH ON SALIVARY STREPTOCOCCUS MUTANS COUNTS AND PLAQUE FORMATION RATE

Nashwa A. Abd-Elhassieb, Nagwa M. Khattaband Wael H. Ahmed,

ABSTRACT
Background: Natural Phytochemicals Can Be An Effective Alternative To Antibiotics, Chemotherapeutic Agents And Represent A Promising Approach In The Prevention Of Dental Caries And Other Oral Infection. Aim Of The Study: Was To Compare The Antibacterial Effect Of Garlic Extract Mouthwash With Chlorhexidine Mouthwash On Salivary Streptococcus Mutans Counts And To Evaluate The Rate Of Plaque Formation. Subjects And Methods: The Study Consisted Of Two Parts. In Part 1(in Vitro Study), It Was Carried Out To Estimate The Zone Of Inhibition Of Various Concentration Of Garlic Extract Against S. Mutans. This Minimal Inhibitory Concentration Was Further Used To Prepare The Garlic Extract Mouthwash That Was Used In Part 2. This Part Included 45 Children Who Were Divided In To 3 Groups, Garlic Extract Mouthwash (study Group), Chlorhexidine Mouthwash 0.125% (positive Control) And Sodium Chloride 0.9% ( Negative Control) Respectively. All Subjects Were Advised To Use 10 Ml Of The Assigned Mouthwash Once Daily For 7 Days. On 8th Day, Salivary S.mutans Counts And Plaque Formation Rate Were Assessed And The Data Were Analyzed By Statistical Tests.

Results: Was Revealed That The Minimal Inhibitory Concentration Of Garlic Extract Was 20% That Produced A Zone Of Inhibition Of 30 Mm In Diameter. A Marked Reduction Of S.mutans Count In Group 1 Compared To Group 2 And 3 Where Percentage Reduction Were 96.4%, 87.2% And 63.6% Respectively (p Value < 0.05). Regarding The Results Of Plaque Formation Rate, There Was A Marked Reduction In Group 1 Compared To Group 2 And 3 After Using The Mouthwash.

Conclusions: Garlic Extract Exhibited A Higher Antibacterial Effect Against S.mutans Compared To Chlorhexidine And Saline. Also, Showed Lower Plaque Formation Rate Than Two Other Groups.

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THE EFFECTIVENESS OF CHITOSAN COLLAGEN MEMBRANE WITH AND WITHOUT HYDROXYAPATITE PARTICLES IN THE TREATMENT OF CLASS II MANDIBULAR FURCATION DEFECTS IN HUMANS: A RANDOMIZED CLINICAL AND RADIOGRAPHIC EVALUATION

Mohammed Omar El Borae , Samia A. Darwish, Mona Yehia Abd El Razzak And Hussein Ibrahim Saudi,

ABSTRACT

Objectives: The Present Study Evaluated Clinically And Radiographically The Efficacy Of Chitosan Collagen Membrane With And Without Nanohydroxyapatite Particles, Versus Collagen Or Chitosan Membrane With Nanohydroxyapatite Bone Graft, In The Treatment Of Class II Mandibular Furcation Defects.

Materials and Methods: Forty Intrabony Periodontal Defects In 13 Patients With Mandibular Grade II Furcation Involvement Were Selected According To The Criteria Outlined By Presence Of Class II Furcation Defects With �3 Mm Horizontal Probing Depth, Clinical Attachment Level (CAL) � 5 Mm. The Defects Were Treated With Collagen Membrane Plus Chitosan Mixed Together As One Membrane With Nanohydroxyapatite Particles On Its Surface (c/ch/OH) M As Group 1, Collagen Membrane Plus Chitosan Mixed Together As One Membrane (c/ch) M As Group 2, Nanohydroxyapatite Bone Graft With Collagen Membrane (OH/c) G+m As Group 3, Nanohydroxyapatite Bone Graft With Chitosan Membrane ( OH/ch) G+m As Group 4. The Following Clinical Parameters Were Recorded: PI PD, CAL And BOP At Baseline, 6 & 12 Months Post Therapy And Furcation Assessment (F) At Baseline & 12 Months Post Therapy. CBCT And Standardized Periapical Radiographs Were Taken At Baseline & 12 Months Post-surgery. The Collected Data Was Statistically Analyzed At The Different Follow Up Periods. Clinical

Results: The Results Of The Present Study Showed Significant Reduction Of PD, CAL, BOP And F In All Study Groups Along Different Study Periods With No Significant Difference Between Groups. The Radiographic Results Of The Present Study Showed Significant Reduction Of D, H, W And 3D Using CBCT In All Study Groups Along Different Study Periods With No Significant Difference Between Groups.

Conclusions:Based On The Results Of The Current Study, It Could Be Concluded That, The Combination Of Chitosan With Nanohydroxyapatite, Whether Applied Into The Furcation Itself As A Bone Graft (group 4) Or Incorporated With The Membrane (group 1) Had A Potentiating Effect On The Clinical And Radiographic Outcomes.

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INFLUENCE OF CEMENTATION SYSTEMS ON THE BOND STRENGTH OF IPS E-MAX PRESS CERAMIC CROWNS

Amr Mohammed Almesery , Mohamed Farag Ayad And Amany Mohammed Korsel,

ABSTRACT


Purpose: This Study Was Done To Evaluate The Influence Of Different Cementation Systems On The Bond Strength Of IPS E-max Press Ceramic Crowns To The Tooth Surface

Materials and Methods: Twenty Freshly Extracted Human Incisors Received Standardized Tooth Preparation For All Ceramic Crowns. The Specimens Were Divided Into 4 Groups Based On The Type Of Resin Cement Used, Each Group Included Five Teeth For Each Group .Group I: The Crowns Were Cemented With Variolink N(VN) Total Etch Resin Cement, Group II: The Cementaion With Variolink Veneer(VV) Total Etch Resin Cement, GroupIII: With Bifix SE Self Adhesive Resin Cement,while GroupIV: The Cemention With G Cem Self Adhesive Resin Cement. All Specimens Subjected To Tensile Bond Strength Test Using An Instron Testing Machine (Model 3345; Instron Industrial Products, Norwood, USA) With A Load Cell Of 5 KN At Cross Head Speed (1mm/min). Mean Values For Each Group Were Calculated, And Differences Between The Groups Were Tested For Statistical Significance By Use Of One-way Analysis Of Variance (ANOVA).

Results: The Highest Tensile Bond Strength Mean Value Recorded For VN Group (7.081�1.32 MPa) Followed By VV Group Mean Value (4.377�0.919 MPa) Then GC-CEM Group Mean Value (3.981�0.522 MPa) While The Lowest Tensile Bond Strength Mean Value Recorded For Bifix Group (3.497�0.602 MPa). The Difference Between All Cement Groups Was Statistically Significant As Revealed With One-way ANOVA Test (p<0.05). ). Pair-wise Tukey?s Post-hoc Test Showed Non-significant (p>0.05) Differences Between ( VV Group And GC-CEM Group), (VV Group And Bifix Group) And (GC-CEM Group And Bifix Group)- Conclusion: The Total Etch Resin Cements Represent The Most Reliable Way For Achieving The Best Bond Strength To E-max Press Ceramic Crowns In In-vitro Study, Where E-max Press Ceramic Crowns Showed Better Bonding Strength To Tooth Structure When Luted With Variolink N(VN) Total Etch Resin Cement Compared To Other Cement Systems

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DEVELOPMENT OF PERMANENT DENTITION IN A GROUP OF EGYPTIAN CHILDREN AT THE AGE OF 6-8 YEARS

Mahmoud Mohamed Hassan, Adel ELBardissy And Rania Abdallah Nasr,

ABSTRACT
Dental Age Estimation Techniques For Identification Of A Person Or Identifying His Age Gained A Lot Of Interest In The Last Few Years Because Of The Human Trafficking And The Immigration Of People Without Birth Records. Aim Of The Study: The Aim Of The Current Study Was To Study The Validity Of Modified Demerjian Method Of Dental Age Estimation On Egyptian Children Aged 6-8 Years

Materials and Methods: A Retrospective Study Performed On 200 Digital Panoramic Radiographs Of A Group Of Egyptian Children With Age Ranging From 6 To 8Years. Records Of Children Were Selected From University-Faculty Of Oral And Dental Medicine Radiology Department.

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THE EFFECT OF NITROGEN PLASMA SURFACE TREATMENT ON THE SURFACE ROUGHNESS AND WETTABILITY OF THE FILLED AND THE UNFILLED POLY ETHER ETHER KETONE (PEEK) (AN IN VITRO STUDY)

Mohammed Noor, Maha Wagdy Elkerdawy And Amr ElKhadem,

ABSTRACT


Introduction: Titanium And Its Alloys Have Been Considered As The Golden Standard Material For The Production Of Dental Implants Because Of The Favorable Long-term Survival Rates Compared To Any Other Materials. Nowadays New Materials Have Emerged And Have Started To Compete With The Titanium To Become The Number One Material To Be Used As Dental Implants. One Of These Materials Is The Polyetheretherketone (PEEK) Which Has Better Esthetics And Stress Distribution Than Titanium.
Objectives: To Test Whether The Nitrogen Plasma Surface Treatment Will Improve The Surface Wettability And The Roughness Of The CFR-PEEK, Ceramic Filled PEEK And The Unfilled PEEK Which Could Aid In Increasing The Osseointegeration Of These Materials When They Will Be Used As Dental Implants. Subjects And Methods: 7 Samples Of Unfilled PEEK, 7 Samples Of Ceramic Filled PEEK And 7 Samples Of Carbon Filled PEEK. The Samples Were Cylindrical In Shape And Each Sample Had Dimensions Of 10 Mm Diameter And 2.5 Mm Height. The Roughness And Contact Angle Readings Were Obtained For Each Sample Before And After Nitrogen Plasma Treatment.

Results: There Was An Improvement In The Surface Wettability Of The Three Groups With Both Unfilled PEEK And Ceramic Filled PEEK Groups Having Statistically Significant Results. Surface Roughness Was Increased In All Three Groups Although The Increase Was Not Statistically Significant. Conclusion: Nitrogen Plasma Surface Treatment Is An Effective Way To Increase The Wettability Of The PEEK Materials However The Effect On Surface Roughness Is Questionable.

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