Prosthodontics and Prosthodontology Commons^™

Comparison Of Maxillary Anterior Teeth Width To Facial Dimensions Among Three Races, Ewa Parciak

Loma Linda University Electronic Theses, Dissertations & Projects

Dental esthetics and tooth proportions have become increasingly relevant in dentistry, as the cosmetic demands of patients increase. Determining the appropriate esthetic dimensions of the maxillary anterior teeth is an important aspect in fixed and removable prosthodontics. The proportion of facial structures and the relationship between facial measurements and natural teeth could provide additional guidance in selecting denture teeth as well as in determining ideal teeth size for fixed restorations. There have been many publications on this topic, however, the subjects in these studies have been mostly selected from the Caucasian race. With the increasing diversity of the American population …

Comparative Study Of Implant Stability And Bone Height Changes Among Different Implant Designs Retaining Partial Overdenture, Fardos N. Rizk

Dentistry

Objective: This study was conducted to assess the primary stability of Trabecular Metal Dental Implant and Tapered Screw Vent Implant to determine the appropriate time for their loading by lower partial overdenture and to follow up for one year the changes in implant stability and crestal bone height surrounding the implant after loading it. Materials and Methods: The study was performed on ten lower Kennedy class I partially edentulous male patients. Each patient received one implant at the second molar area in each side of the ridge, where Trabecular Metal Dental Implant was inserted in the left side of the …

Osseointegration Of Wrapped Dental Implants In Rabbits, Alex Whitehead

AUCTUS: The Journal of Undergraduate Research and Creative Scholarship

Edentulous patients (those lacking teeth) require one of two approaches to augmentation: inserting a vertical bone graft, or subperiosteally anchoring a device on which an implant can be attached. Bone grafts have had unpredictable results and can undergo resorption over time, compromising implant stability and success. As of the subperiosteal approach, current materials have not proven to directly integrate with the bone, in a process termed osseointegration. Therefore, we used additive manufacturing to create a Ti6Al4V alloy surface with a specific roughness to determine if it would be osseoinductive in a challenging rabbit model over six weeks.

Restorative Characteristics Of Intrapulpally Cracked Teeth, Charles M. Beavers

Theses and Dissertations

Cracked teeth have long presented a diagnostic challenge. Previous investigators have considered possible predictive factors, many of which revolve around the tooth’s restorative characteristics. Few have investigated the restorative status of teeth with cracks extending into the pulp chamber. The purpose of this investigation was to determine the prevalence of the different types of restorations present in intrapulpally cracked teeth and determine any other restorative factors that may aid in predicting the presence or extent of an intrapulpal crack. Intrapulpally cracked molars requiring endodontic therapy at the VCU Graduate Endodontic Practice were included in this study. For each tooth, the …

The Effect Of Root Canal Cleansing On The Retention Of Glass Fiber-Reinforced Posts, Faisal Dhaifallah Al-Qarni

Loma Linda University Electronic Theses, Dissertations & Projects

Esthetic glass fiber-reinforced posts are being used more often. The most commonly reported complication associated with these posts is debonding. Dentine conditioning with solutions such as EDTA or MTAD results in removal of smear layer and might improve the retention of posts to root canal dentin. Therefore, the purpose of this study was to investigate the effect of cleansing the post space with MTAD or EDTA on the bond strength of glass fiber-reinforced posts, when cemented with self-adhesive resin cement. Forty-five (n=15) extracted human premolar teeth were sectioned at the cemento-enamel junction to obtain root length of fifteen millimeters. Endodontic …

Radiographic Evaluation Of Accuracy Of Surgical Stent For Implant Placement In Knife Edge Posterior Mandibular Ridge In Cases Of Ridge Splitting, Fardos N. Rizk, Engy Abdelhamed

Dentistry

Aim: This study was conducted to evaluate the efficacy of using conventional surgical stents guided by cone beam computed tomography in determining the position and buccolingual inclination of implants placed in posterior mandibular knife edge ridge in cases of ridge splitting with and without bone grafting material. Materials and Methods: The study was conducted on sixteen implants placed bilaterally in posterior knife edge mandibular ridge of four patients, where each patient received four implants in the form of two in each side. Implants on the right side of the ridge were placed following ridge splitting and bone grafting (group A). …

Comparing The Vertical Misfit Of Casts Produced By Two Verification Jigs, Abdulaziz Saeed Alqahtani

Master's Theses (2009 -)

Purpose: To compare the dimensional accuracy between master casts fabricated with verification jigs made of acrylic resin and light cure Triad. Materials and Methods: 10 GC Pattern resin Pattern verifications jigs and 10 Triad gel verification jigs fabricated of a master cast of a mandibular model of 4 internal hex implants. A stone base was fabricated for each verification jig. One screw test was used to evaluate the vertical gap at the terminal abutment using a digital micrometer with an accuracy of 1μm to record the vertical gap for each sample. Results: Triad Gel group has the lowest average distortion …

Effect Of Two Different Attachments On The Supporting Structures And Masticatory Capacity Of Implant Retained Mandibular Overdenture, Fardos N. Rizk

Dentistry

Aim: This study was conducted to compare the effect of ball and socket attachment and GPS attachment in implant retained mandibular overdenture cases regarding changes in: crestal bone height and density surrounding implants, electromyographic activity of temporalis and masseter muscles and occlusal biting force. 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 ball and socket attachment while Group-II received GPS attachment upon which mandibular overdentures were …

The Influence Of Vitamin D Metabolism On Gene Expression, Matrix Production And Mineralization During Osteoprecursor Cell-Based Bone Development, Shelley S. Mason, Sean S. Kohles, Shelley R. Winn, Randy D. Zelick

Biology Faculty Publications and Presentations

Background: Multipotential precursor cell lines derived from human bone marrow, capable of differentiating into cartilage or bone, may provide a useful tissue development model for studying the regulation and metabolism of putative growth and differentiation factors necessary for tissue regeneration. In mammals, the process of bone development depends on the proliferation and differentiation of osteoblast lineage cells, and the subsequent synthesis and mineralization of bone extracellular matrix (ECM). Vitamin D metabolites play a pivotal role in bone and mineral homeostasis, and are positive factors on bone development. Recently, it was demonstrated that a human-derived engineered osteoblast precursor cell line (OPC1), …

Comparison Of Occlusal Plane Orientation Obtained Using Five Facebow Systems, Thomas C. Maveli

Loma Linda University Electronic Theses, Dissertations & Projects

PURPOSE: An in vitro investigation analyzing the sagittal and coronal orientation of the occlusal plane using five different facebow transfer systems. MATERIALS AND METHODS: A phantom head containing a maxillary typodont (the control) was oriented so that Frankfort Horizontal Plane (FHP) corresponds with the horizon. The angle between the occlusal plane of the maxillary arch of the phantom head and the FHP was measured along the sagittal and coronal planes using a digital protractor. Fifteen Facebow records using each of 5 facebow transfer systems (the test groups) were made on the phantom head containing the maxillary typodont. Diagnostic casts of …

Surface Roughness Of Feldspathic Porcelain Polished With Alumina-Zirconia Paste, ศุภรักษ์ ยมกกุล

Chulalongkorn University Theses and Dissertations (Chula ETD)

The purpose of this study was to develop a new polishing paste composed of zirconia that was leftover from the zirconia crown/bridge fabrication process that is as effective as diamond paste when used to polish feldspathic porcelain. This study was divided into two parts. First part was to study the surface roughness of feldspathic porcelain after polishing with diamond, alumina, zirconia and alumina-zirconia paste. The result showed that porcelain polished with zirconia paste had the highest mean Ra value, porcelains polished with alumina and alumina-zirconia paste had lower Ra values than zirconia paste while porcelain polished weight diamond paste demonstrated …

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 …

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 …

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 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.