Prosthodontics and Prosthodontology Commons^™

Comparative Evaluation Of Two Different Castable Bar Attachments In Implant Retained Mandibular Overdenture Cases, Fardos N. Rizk

Dentistry

Objective: This research was carried to evaluate which solitary attachment; OT Cap Ball attachment or OT Cap Equator Profile attachment mounted on a bar splinting two implants retaining mandibular overdenture is more favorable regarding crestal bone height and bone density changes surrounding the implants using cone beam computed tomography. Materials and Methods: Following two stage surgical protocol twelve completely edentulous patients received two implants placed bilaterally in the canine region (24 implants) to retain mandibular overdenture. Four months following the surgery patients were randomly divided into two equal groups; Group-I received two OT Cap Ball attachments mounted on a bar …

Radiographic Evaluation Of Marginal Bone Levels Around Platform-Switched Implants And Non-Platform-Switched Implants Immediately Loaded To Support Mandibular Overdenture, Fardos N. Rizk, Eatmad Elrekaby

Dentistry

Objective: This clinical study was conducted to assess the marginal bone level around two different types of implant abutment junctions which are the platform-switched connection and non-platform- switched connection used in cases of implants supporting mandibular overdentures following the immediate loading protocol. Materials and Methods: Twelve completely edentulous male patients were randomly divided into two equal groups: Group I: Each patient received two Legacy I Implants designed with internal bevel having 3.5mm implant platform diameter to which 3.5mm neck diameter healing collars were threaded creating a matching or non-platform switching mechanism at the implant abutment junction. Group II: Each patient …

Evaluation Of Accuracy Of Impression Materials With Different Mixing Techniques, James Ywom

Loma Linda University Electronic Theses, Dissertations & Projects

Purpose: To investigate gypsum compatibility and dimensional stability of irreversible hydrocolloid impression materials with three mixing techniques. A comparison between vacuum-mixed, mechanically-mixed and manually-mixed techniques was evaluated for each impression material. Materials and Methods: Three irreversible hydrocolloid impression materials Kromopan 100® (Lascod™), Identic® (Dux dental™), and Jeltrate Plus® (Dentsply™) were tested gypsum compatibility in accordance with ANSI/ADA Specification No. 18 for alginate impression materials. The test for linear dimensional stability was tested in accordance with ANSI/ADA Specification No. 19 for elastomeric impression materials. A One-way ANOVA test was used to analyze dimensional stability at a significance level of (p < 0.05). Conclusion: The vacuum mixing technique facilitates the mixing of irreversible hydrocolloid impression materials and improves the compatibility with gypsum material and reproduces a more dimensionally accurate cast than the other mixing techniques.

Premaxillary Characteristics In Complete Bilateral Cleft Lip And Palate: A Predictor For Treatment Outcome, Noha Ibrahim Abdelrahman Professor, Islam Tarek Hassan Professor

Dentistry

Objectives:

The aim of the current study was to investigate how bilateral cleft lip and palate (BCLP) cases responded differently to presurgical orthopedics (PSO) and primary lip repair (LR) based on premaxillary characteristics. We suggest a clinically oriented descriptive classification for BCLP based on premaxillary characteristics.

Design and Setting:

A retrospective longitudinal comparative study where available records of all non-syndromic patients with complete BCLP attending the Cleft Clinic, affiliated to the Oral and Maxillofacial Surgery department, Ain-Shams University, Cairo, Egypt were assessed.

Sample Population and Methodology:

Twenty-two cases were collected over a 4-years period from 2008 to 2011 (15 boys …

Verification Of The Accuracy Of Electronic Mandibular Movement Recording Devices: : An In Vitro Investigation, Joshua Heath Balch

Theses and Dissertations (ETD)

One goal of restorative dentistry is to truly capture maxillomandibular relationships that accurately reproduce mandibular border movements and that would prescribe the best occlusal interface. Registration of horizontal and sagittal movements of the patient allows maximum cusp height and fossae depth with proper placement of occlusal ridges and grooves. The goal is to develop an occlusion that is interference free and entails the concepts of organic occlusion. Methods to transfer patient information to a highly adjustable articulator include mechanical recorders, mechano-electronic recorders and optoelectronic recorders. The purpose of this study is to verify the accuracy of electronic mandibular movement recording …

In Vitro Staining Of Denture Liners And Potential For Color Correction Using Commonly Available Denture Cleansers, Russell D. Morrell

Theses and Dissertations (ETD)

Background: Denture liners are routinely used as part of immediate denture therapy, following surgery involving edentulous tissues, and to improve the function and stability of existing removable prostheses. Appropriate application of denture liners can facilitate patient comfort during prolonged therapy and prior to placement of definitive restorations. However, concern has been raised regarding the susceptibility of common denture liners to agent-induced color change which, in turn, adversely impacts the esthetic appeal of the associated removable prosthesis.

Objective: The purpose of the study was to evaluate the color stability of denture liners exposed to commonly encountered food stains and commonly used …

In‐Vitro Comparison Of Tensile Bond Strength Of Denture Adhesives On Denture Bases, Doris Rachel Kore

Loma Linda University Electronic Theses, Dissertations & Projects

PURPOSE: To evaluate the tensile bond strength (TBS) of three cream denture adhesives and one wafer denture adhesive on three denture base materials at five time intervals up to 24 hours. METHODS: Fixodent (Proctor & Gamble™), Super Poligrip (GlaxoSmithKline™), Effergrip (Prestige Brands, Inc.™), and SeaBond (Combe™) were tested with the Instron testing machine on three denture base resin cylinder models fabricated from two heat‐polymerized (Lucitone 199 and SR Ivocap) and one visible lightcured, shade stable (Eclipse) acrylic resins. Laboratory prepared artificial saliva with mucin was used for the control study. In accordance with ADA specifications, the TBS was tested at …

Effect Of Time On Gypsum-Impression Material Compatibility, John Boram Won

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this study was to evaluate the compatibility of dental gypsum with three recently introduced irreversible hydrocolloid (alginate) alternatives. The test materials were Alginot® (Kerr™), Position Penta Quick® (3M ESPE™) and Silgimix® (Sultan Dental™). The irreversible hydrocolloid impression material, Jeltrate Plus antimicrobial® (Dentsply Caulk™) served as the control. Materials and Methods: Testing of materials was conducted in accordance with ANSI/ADA Specification No. 18 for Alginate Impression Materials. Statistical Analysis: The 3-Way ANOVA test was used to analyze measurements between different time points at a significance level of (p < 0.05) Outcome: It was found that there was greater compatibility between gypsum and the alternative materials over time than the traditional irreversible hydrocolloid material that was tested. A statistically significant amount of surface change/incompatibility was found over time with the combination of the dental gypsum products and the control impression material (Jeltrate Plus antimicrobial®).

Virtual Three-Dimensional Analysis Of Dimensional Accuracy Of Dental Master Die Models Created By The Iterotm Electronic Impression Device And Those Made From A Polyvinyl Siloxane Impression Material, Polina P. Shcherbatov

Master's Theses

No abstract provided.

Analysis Of Periapical Biopsies Submitted For Histopathological Evaluation: A Retrospective Study, Abdullah I. Alqaied

Master's Theses

Apical periodontitis is the most common pathological process in the periapical region. Disciplined clinical and radiographic evaluations and appropriate diagnostic tests can detect lesions related to apical periodontitis. Aside from this, lesions mimicking pulp-related pathology but unrelated to pulpal infection and necrosis are occasionally discovered in the periapical region. The objective of this study was two-fold: (1) to determine the prevalence of diverse periapically located pathological entities, and (2) to apply that information to evaluate the rationale for routine submission of surgically obtained tissue for histological examination and diagnosis. Methods: A 5-year retrospective analysis of pathology reports from the UCONN …

Effect Of Two Different Implant Structures On Stresses Induced Within The Surrounding Bone Using Three Dimensional Finite Element Analysis, Fardos N. Rizk

Dentistry

objective: The purpose of this study is to compare the stresses induced within the bone surrounding the Trabecular Metal Dental Implant (Zimmer Dental Inc., Carlsbad, CA, USA) in comparison to the stresses induced within the bone surrounding its predicate Tapered Screw Vent Implant (Zimmer Dental Inc., Carlsbad, CA, USA) using three dimensional finite element analysis. materials and methds: The current finite element analysis simulated a clinical situation where an edentulous mandible was restored with an entirely implant supported cantilever bar overdenture retained by five implants placed parallel to each other in the interforaminal region opposed by a complete denture. Two …

Comparative Study Of Ot Equator Profile Attachment Versus Gps Attachment In Implant Retained Mandibular Overdenture Cases, Fardos N. Rizk

Dentistry

Aim: This study was carried out to evaluate whether OT Equator Profi le attachment or GPS attachment is less destructive to crestal bone around implants and to bone in distal aspect of the ridge in implant retained mandibular overdenture cases. Materials and Methods: Following two stage surgical protocol twelve completely edentulous patients received two implants placed bilaterally in the canine region (24 implants) to retain mandibular overdentures. Four months following the surgery patients were randomly divided into two equal groups; Group-I received OT Equator Profi le attachment while Group-II received GPS attachment upon which mandibular overdentures were retained. Once patients …

Radiodensitometric Evaluation Of The Effect Of Low Energy Laser Irradiation With And Without Anioxidant Therapy On Immediately Loaded Implant Supported Overdenture, Fardos N. Rizk, Mouchira Salah Eldin Prof.

Dentistry

objective: The purpose of this study is to compare the bone height and density around immediately loaded implants placed in the canine area supporting a mandibular overdenture in four different groups. The first group received low level laser therapy and antioxidants. The second group received antioxidants only. The third group received low level laser therapy only. The fourth group (control group) received no therapy. materials and methods: Following one stage surgical protocol twenty four implants were inserted bilaterally in the canine region to support mandibular overdentures for twelve completely edentulous patients in the form of two implants per patient. Patients …

In Vivo Measurement Of Color Relationships Between The Maxillary Central Incisor And Canine As A Function Of Age, Marie E. Falcone

Master's Theses

Abstract

Introduction

It has long been taught that the basic shade (hue) of the patient can be taken from the canine (i.e. that tooth thought to have the highest chroma of a particular hue) and then that hue can be applied to other anterior teeth but at a lower chroma. However, this concept does not appear to derive from published measurements or observations. This study documented the color relationship between in vivo maxillary central incisors and canines to examine: (1) whether they share the same hue, but have different chromas (as commonly taught); and, (2) whether color differences (∆E values) …

Hyperbaric Oxygen Therapy For Promoting Osseointegration Around Dental Implants In Heavy Smokers, Fardos N. Rizk, Nasser Shaheen

Dentistry

Objective: The purpose of this study is to evaluate the effect of hyperbaric oxygen (HBO) therapy on osseointegration of implants supporting mandibular overdenture in heavy smokers. Materials and Methods: Following two stage surgical protocol twelve completely edentulous male heavy smokers received implants placed bilaterally in the canine region to support mandibular overdenture. On the second day after the surgery patients were divided randomly into two equal groups. Patients of group I were placed on a protocol of five consecutive sessions of HBO therapy, while patients of group II received no therapy and served as control. Four months following the surgery …

Evaluating Dimensional Accuracy And Reliability Of "Stitched" Small Field Of View (Ssfov) Cone Beam Computed Tomography (Cbct) Datasets For Use In Proprietary Dental Implant Guided Surgery Software, Nicholas Luke Egbert

Theses and Dissertations (ETD)

Background: Recently a "stitched" small field of view (SSFOV) cone beam computed tomography (CBCT) extraoral imaging system (Kodak 9000D, Carestream Health Inc, Kodak Dental Systems, Marne‑la‑Vallee, France) has been released. The benefits of the 3D stitching module of stitched SFOV CBCT may include: broader range of applications, affordability, flexibility, safety optimizing radiation dose and improved workflow. With the reduced effective dose of radiation and cost to both the patient and clinician, this superior imaging modality becomes more accessible to the community, potentially elevating the standard of care. Currently, stitched data sets are restricted to diagnostic data gathering only. To date, …

Eccentric Interchangeability Of The Semi‑Adjustable Articulator: A Pilot Study, Mark James Hopkins

Theses and Dissertations (ETD)

Background: Dental articulation is a method of approximating the patient's mandibular motion in order to allow for analysis of dental relations and fabrication of appliances. The most prevalent method used in teaching institutions is the semi-adjustable articulator. Several of these instruments claim interchangeability without loss of clinical accuracy and studies have supported this claim. No studies to date have assessed the interchangeability of the articulators in any relation other than hinge axis closure. Assessment of the accuracy of interchangeability of calibrated articulators will inform the profession of this parameter of articulation and allow for informed decisions on whether or not …

Tomographic Assessment Of Different Attachment Sizes In Implant Supported Overdenture, Fardos N. Rizk, Marwa Sabet, Wael Amer

Dentistry

objective: This research was carried to evaluate which ball size mounted on bar splinting two implants supporting overdenture is more favorable regarding bone height and density. material &methods: Two implants(Tut Dental Implant System,ECDI Cairo, Egypt) splinted by bar (OT bar Multiuse attachments,Cas,RHEIN 83, ITALY) carrying two balls (OT Cap attachments, Cas, RHEIN 83 Italy) were inserted in n=10/gp. Patients were divided into two groups according to the size of the balls used which were either micro1.8mm or macro 2.5mm (control group). For all patients overdentures were constructed & conventional tomograms were taken. Crestal bone height & density around the implants …

The Effect Of Two Different Implant Systems On Bony Changes In Mandibular Implant Supported Overdenture, Fardos N. Rizk, Eatmad Elrekaby, Azza Farahat

Dentistry

objective: This study was conducted to evaluate the bone changes that may occur around Legacy I implants and NanoTite Tapered implants supporting mandibular overdentures utilizing cone beam computed tomography (CBCT). materials and methods: Fourteen completely edentulous male patients were randomly divided into two equal groups. Group I: Each patient received two Legacy I implants. Group II: Each patient received two NanoTite Tapered Implants. All implants were inserted bilaterally in the mandibular canine region. For all patients conventional complete dentures were constructed before implants placement. After complete osseointegration of implants, dome shaped healing collars were screwed to the implants upon which …

A Comparative Evaluation Of Locator Versus Ball And Socket Attachment In Implant Retained Mandibular Overdenture Cases Using Cbct, Fardos N. Rizk, Marwa Sabet Prof., Amany Elhadary, Wael Amer

Dentistry

No abstract provided.