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Articles 1 - 12 of 12
Full-Text Articles in Dentistry
Effects Of Fluoride On Corrosion Properties Of Orthodontic Retention Wires, John J. Simindinger
Effects Of Fluoride On Corrosion Properties Of Orthodontic Retention Wires, John J. Simindinger
Master's Theses (2009 -)
Objective: Alloys used in retention wires corrode in the oral environment. Previous studies have examined the effects of fluoride on archwires used in active treatment, but not on retention wires. The goal of this study was to determine what effect fluoride exposure has on corrosion of various lingual bonded retainer wires in the mouth. Methods: Twenty samples from six different wire types were tested in two solutions. Half were tested in Fusayama-Meyer artificial saliva, while the other half were tested in Fusayama-Meyer plus fluoride correlated to the concentration of toothpaste. A potentiostat was used to measure open circuit potential (OCP) …
In Vitro Study To Analyze Reverse Torque Values Of Prosthetic Screws With Multiple Loosening/Tightening Preload Cycles, Amira Alhameed
In Vitro Study To Analyze Reverse Torque Values Of Prosthetic Screws With Multiple Loosening/Tightening Preload Cycles, Amira Alhameed
Master's Theses (2009 -)
Purpose: To determine the number of loosening/tightening preload cycles prosthetic retaining screws can withstand before fracture, and to record the reverse torque values on each of the 10 applications of screw tightening and loosening. Materials and methods: The testing assemblies consisted of 30 temporary cylinder/multiunit abutment/internal connection implants, 10 each from Biohorizons, Zimmer Biomet Dental, and Dentsply Sirona Astra; the specimens were inserted into resin blocks. Temporary cylinders were connected to the abutments with new prosthetic screws and torqued to the appropriate preloads. The first tests of repeated tightening/loosening preload cycles were applied using a Digital ® torque gauge instrument …
Comparing Orthodontic Debonding Aerosol Production With Various High-Volume Evacuation Systems, Eric Moe
Comparing Orthodontic Debonding Aerosol Production With Various High-Volume Evacuation Systems, Eric Moe
Master's Theses (2009 -)
Objective: The COVID-19 pandemic has placed a new emphasis on defining aerosol generating procedures and evaluating ways to reduce those aerosols. Both biocontaminants and particulate matter can potentially be transmitted with dental aerosols with negative health effects associated with each, especially aerosols with particulate matter of 2.5 micrometers or less (PM2.5). This study aims to evaluate the PM2.5 aerosol production from orthodontic debonding with a high-speed, air-driven handpiece without water coolant and assess the effectiveness of traditional four-handed high-volume evacuation (HVE) and two commercially available hands-free high-volume evacuation (HFHVE) systems. Methods: Orthodontic debonding was simulated using a dental manikin and …
Effects Of Cleaning Agents On The Properties Of Two Different Thermoplastic Retainer Materials, Jennifer Brehove
Effects Of Cleaning Agents On The Properties Of Two Different Thermoplastic Retainer Materials, Jennifer Brehove
Master's Theses (2009 -)
Objective: There are several different thermoplastic retainer materials and cleaning methods available to fabricate and clean clear retainers. Some studies have investigated the changes in properties of clear retainers after being exposed to different staining agents, varying levels of mechanical strain, and different cleaning agents. However, there are few studies that compare different thermoplastic materials to each other when being subjected to these different types of stresses. The aim of this study is to evaluate the changes in properties of two commonly used thermoplastic retainer materials, polyethylene terephthalate (PETG) and ethylene/propylene (EP), after exposure to different retainer cleaning agents over …
Mechanism Of Mechanical Vibration In Enhancing Orthodontic Retention, Brent A. Ito
Mechanism Of Mechanical Vibration In Enhancing Orthodontic Retention, Brent A. Ito
Master's Theses (2009 -)
Introduction: Low-magnitude, high-frequency (LMHF) mechanical vibration is proven to be anabolic and can increase alveolar bone mass. The objectives of this study were to generate an orthodontic retention cell culture model and investigate the effects of LMHF mechanical vibration on human periodontal ligament fibroblast (HPLF) cells after orthodontic loading (retention) in vitro. Materials and Methods: HPLF cells were seeded at a density of 4x105/well in 6-well Flexcell culture plates (Day 0). On day 3, the cells were mechanically stretched (15% surface extension) for 1 hour to mimic orthodontic loading/tension in vitro. On day 5, the cells were randomly assigned to …
Bending And Phase Transformation Properties Of A Force Gradient Nickel-Titanium Orthodontic Wire, Brinda Shah
Bending And Phase Transformation Properties Of A Force Gradient Nickel-Titanium Orthodontic Wire, Brinda Shah
Master's Theses (2009 -)
Objective: Conventional nickel-titanium (NiTi) archwires have widespread application in orthodontics due to their unique properties and ability to move teeth with light, continuous forces, but a shortcoming is that they apply near-uniform force along anterior and posterior teeth. Since the force needed to effectively move teeth is a function of the root surface area and bony support, these archwires cause single-rooted teeth to move more than the multi-rooted molars. With the advent of laser-engineered force gradient NiTi orthodontic archwires, individual forces may be applied to different segments or individual teeth of the arch to maximize tooth movement. The aim of …
Shear Bond Strength Characteristics On Surface Treatment Modalities Of Cad-Cam Resin Based Core Materials, Nikita Sinha
Shear Bond Strength Characteristics On Surface Treatment Modalities Of Cad-Cam Resin Based Core Materials, Nikita Sinha
Master's Theses (2009 -)
Introduction: Innovations in computer aided design and computer aided manufacture (CAD-CAM) have made the manufacture of new restorative and prosthetic materials possible. They have enabled fabrication of complete arch implant supported fixed dental prosthesis (CAISFDP) in metals and polymers a reality. There are several materials which are available to fabricate a CAISFDP and it is important to find biologically, economically and aesthetically viable options for milled, cast and printed metal and non-metal structures. Objectives: The purpose of this in-vitro test was to analyze the shear bond strength of composite to Trilor material for CAISFDP restorations. Material and Methods: A total …
The Influence Of The Operator Experience On The Accuracy Of Implant Placement: An In Vitro Study, Jeffrey Garcia
The Influence Of The Operator Experience On The Accuracy Of Implant Placement: An In Vitro Study, Jeffrey Garcia
Master's Theses (2009 -)
Purpose: The aim of this study is to evaluate the influence of operator experience in the fully guided placement of implants in dentate patients. Methods: Three different providers with different level of experience in implant surgery (unexperienced, moderate experienced = 2 years of experience, and experienced = more than 5 years of experience in implant surgery) placed each n=20 implants fully guided or free hand in identical replicas, produced from a CBCT of a partially edentulous patient case. The achieved implant position was digitized by using a laboratory scanner and compared with the planned position. Trueness (planned versus actual position) …
Outcomes Of Nonsurgical Root Canal Therapy Completed In Children Aged 6-13 Years, Lauren M. Loney
Outcomes Of Nonsurgical Root Canal Therapy Completed In Children Aged 6-13 Years, Lauren M. Loney
Master's Theses (2009 -)
Introduction: Tooth survival following non-surgical root canal treatment (NSRCT) in adult populations has been documented as high as 97%. However, to our knowledge, no studies have examined tooth survival following NSRCT in children. The aim of this study was to determine the long-term outcomes of non-surgical root canal treatment in children aged 6-13 years provided by both endodontists and other providers.Methods & Materials: Insurance claims from the Delta Dental of Wisconsin Insurance database of 4927 anterior and molar NSRCT completed in children aged 6-13 years from the years 2002-2014 were analyzed. The teeth were followed during continuous insurance eligibility from …
Root-End Surgery Or Nonsurgical Retreatment: Are There Differences In Long Term Outcome?, Enida Haxhia
Root-End Surgery Or Nonsurgical Retreatment: Are There Differences In Long Term Outcome?, Enida Haxhia
Master's Theses (2009 -)
INTRODUCTION: The decision of which modality of secondary endodontic treatment to perform is multifactorial and clinician dependent. Literature surrounding the long-term survival of nonsurgical retreatment compared to root-end surgery remain equivocal and warrant further investigation. This 7-year retrospective study seeks to compare the outcome of nonsurgical retreatments with that of root-end surgeries performed on teeth without prior nonsurgical retreatments. METHODS: Insurance claims from 1021 teeth of 987 patients in the Delta Dental of Wisconsin database were analyzed from the years 2008–2017. Tooth survival was evaluated using Cox regression models and p-value was set at 0.05. Survival time was considered from …
Correction Of Excessive Gingival Display: Lip Repositioning With/Without Myotomy, Austin Michael Dodge
Correction Of Excessive Gingival Display: Lip Repositioning With/Without Myotomy, Austin Michael Dodge
Master's Theses (2009 -)
Background: Lip repositioning (LR) is a conservative and reversible surgical method for correcting excessive gingival display (EGD). Purpose: The study aims to compare two LR techniques. The objectives include 1) comparing the amount of gingival display reduction (GDR) after LR without (Group 1) and with (Group 2) myotomy, stratified in accordance with the etiology of the EGD 2) Comparing the gingival display rebound (GDRB) 3) compare subject satisfaction and morbidity. Methods: After obtaining IRB approval, 20 human subjects with EGD (measured apical to the CEJ of #9) were randomly allocated for surgery without and with myotomy. Pre-operative, diagnostic information were …
The Incidence Of Root Canal Therapy Or Extraction After Orthodontic Treatment: A Ten-Year Retrospective Study, Thomas Korte
The Incidence Of Root Canal Therapy Or Extraction After Orthodontic Treatment: A Ten-Year Retrospective Study, Thomas Korte
Master's Theses (2009 -)
INTRODUCTION: The impact of orthodontic treatment on anterior teeth specifically in relation to root canal therapy and extraction has not been previously described. The objective of this study was to evaluate the incidence of root canal therapy and extraction after orthodontic treatment in the anterior permanent dentition.Methods: We analyzed insurance claims and enrollment data for individuals enrolled with Delta Dental of Wisconsin from 2008 to 2017. A total of 63,720 teeth from 5310 patients who had Delta Dental insurance at age 10 were included in the study. The Cox Regression model was used to analyze the effect of the …