Dentistry Commons^™

Activated Charcoal Versus A Chemical Whitening Agent: Effect On Human Enamel, Hien Thai Doan

Master's Theses (2009 -)

Objective: For many years, the conventional method to achieve a white smile has been chemical regimens such as peroxide compounds. Previous studies suggest risks associated with chemical procedures, so many are seeking out alternative options such as utilizing activated charcoal. Since this new method is rapidly trending, there have not been many scientific studies on how utilizing activated charcoal can affect the mechanical/physical properties of tooth structure. The primary objective of this study was to investigate the effect of activated charcoal on enamel’s mechanical/physical properties and compare it to a conventional tooth whitening method (carbamide peroxide). Materials and Methods: Extracted …

Color Characterization Of Color Changing Orthodontic Adhesives, Megan Fried

Master's Theses (2009 -)

Objective:A popular product to facilitate removal of excess adhesive during bonding of orthodontic appliances is a color changing adhesive. Before polymerization, these materials are a bright color but upon curing, manufacturers claim they become translucent. After debonding, there is often resin embedded within the enamel, so the appearance of these materials after polymerization can affect the esthetics of a patient’s dentition. The purpose of this study was to analyze the color characteristics of various orthodontic color changing adhesives and determine if there is a significant difference in color changing capabilities and in translucency after polymerization between products. Methods:Grengloo and Blugloo …

The Accuracy And Sensitivity Of Abo Electronic Cast Radiographic Program Orthoshare 360 Compared To Manual Measurements, Lisa Nguyen

Master's Theses (2009 -)

Objective: The objective of this study was to assess the accuracy, validity, and reliability of measurements obtained by MotionView's Ortho Share 360 program compared to traditional manual measurements of 3D printed models using a standardized ABO measuring gauge. In detail, the study aimed to evaluate the difference in total ABO Cast Radiographic-Evaluation (CRE) score and individual differences among six ABO CRE parameters. The null hypothesis is that there are no statistically different scores between digital and manual measurements. Methods: 33 samples were measured based on standardized parameters determined by the ABO. The first measurements were obtained manually using ABO measuring …

Mechanism Of Mechanical Vibration In Enhancing Orthodontic Retention- Analysis Of Global Gene Expression, Shuwei Wang

Master's Theses (2009 -)

Introduction: Low-magnitude, high-frequency (LMHF) mechanical vibration has been proposed as a possible adjunctive retention method after orthodontic treatment. In this study, we explored the mechanism of using LMHF vibration to improve bone formation during retention phase. We aimed to provide insight of global gene expression and cellular activities of PDL cells under tension, as well as identify novel biomarkers for induced osteogenesis by using LMHF mechanical vibration as adjunct tool in retention phase. Materials and Methods: Human PDL cells (hPDLCs) were seeded in 6-well FLEXCELL culture plates. The wells were assigned to four experimental groups as control, stretching (ST), vibration …

Autoignition And Sooting Characteristics Of Iso-Octane And Ethanol In An Optical Rapid Compression Machine, Richard John Kempf

Master's Theses (2009 -)

To effectively reduce particulate emissions and maximize the effectiveness of renewable fuels entering the industrial and transportation markets, an accurate understanding of the combustion characteristics of these fuels is a necessary undertaking. Typical engines used in the heavy-duty engine industry primarily rely on mixing-controlled combustion, which has the potential to produce soot under locally rich combustion conditions. A rapid compression machine (RCM) is an experimental reaction vessel used to investigate the ignition and pollutant behaviors of fuels at compressed conditions relevant to engine studies. In this study, an RCM has been prepared with line-of-sight optical accessibility such that a laser …

The Effect Of Tray Design And Impression Material Consistencies On Accuracy Of Complete Arch Implant Supported Fixed Dental Prostheses Master Casts, Lujain Kurdi

Master's Theses (2009 -)

Purpose of this Study: The purpose of this study is to determine the accuracy and precision of complete arch implant supported fixed dental prosthesis impressions made with a low viscosity PVS while supporting the splinted impression copings with heavy viscosity PVS on a reference model simulating an all-on-4 prosthesis using both stock and custom trays. Material and Methods: A model was scanned to act as the reference model. The splinting device and custom tray were printed using FormLAb printer and custom resin tray material. Four group were included in the study. Stock tray with and without support and custom tray …

Evaluation Of Damon Psl And Conventional Mbt Brackets In Leveling And Alignment Efficiency, Jacob Beckstrand

Master's Theses (2009 -)

Objective: Ormco has proposed that the low-friction design of their self-ligation brackets allows for more efficient alignment of crowded teeth with less incisor proclination and faster treatment times compared to conventional MBT bracket systems. The purpose of this study is to examine the hypothesis that there is no difference between Damon PSL and conventional MBT brackets in factors related to leveling and alignment in-vitro. Methods:Damon Q2 .022” slot brackets and 3M Unitek .022” slot MBT brackets were bonded to 2 sets of typodont teeth. Typodont teeth were placed into 8 upper and lower Class I crowding wax forms (Kilgore, USA) …

Edge Chipping Of Translucent Zirconia, Joseph D. Flask, Geoffrey A. Thompson, Maharaj Singh, David W. Berzins

School of Dentistry Faculty Research and Publications

Statement of problem

More translucent dental zirconias have been developed by incorporating the cubic phase and reducing the tetragonal phase content that undergoes transformation toughening, leading to reduced mechanical properties. Whether the clinically relevant mechanical property of the edge chipping toughness of the material is also reduced is unclear.

Purpose

The purpose of this in vitro study was to evaluate the edge chipping toughness and translucency of translucent zirconia, 3mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP), and lithium disilicate.

Material and methods

Two translucent zirconia products, Katana and Lava Esthetic; one 3Y-TZP, Lava Plus; and one lithium disilicate, IPS e.max Press …

Influence Of Free-End Distal Extension On The Accuracy Of Guided Implant Placement: An In Vitro Study, Geoffrey Ganzman

Master's Theses (2009 -)

Purpose: The aim of this study was to evaluate the influence of type of tooth-support (bounded edentulous space versus unbounded edentulous spaces) on the accuracy of fully-guided implant placement using static computer-assisted implant surgery (sCAIS) in partially-dentate patients. Methods: Four different clinical scenarios were simulated; (a) bounded single-tooth edentulous space (BES), and three different free-end distal extensions with (b) unbounded single-tooth edentulous space (UBES1), (c) unbounded two-teeth edentulous space (UBES2), and (d) unbounded three-teeth edentulous space (UBES3). An implant planning software was used to design 3D-printed stereolithographic surgical guides for the respective clinical scenarios. In total n=140 implants with dimensions …

Edge-Chipping And Translucency Comparison Among Lithium Silicate-Based Ceramics, Essa Abdullah Alghamdi

Master's Theses (2009 -)

Purpose: The purpose of this in vitro study was to determine the edge-chipping toughness and the translucency of lithium silicate-based glass ceramics. Materials and Methods: Four lithium silicate/disilicate glass-ceramic materials, IPS e.max CAD and GC Initial LiSi blocks, and two zirconia-lithium silicate glass-ceramic materials, Vita Suprinity and Celtra Duo, were prepared and tested (n=20 specimens/group). Specimens (14 x 12 x 1.5 mm) were sectioned from commercially available chairside computer-aided design/computer-aided manufacturing (CAD-CAM) blocks, fired (if indicated), ground, and polished. Translucency was assessed via a spectrophotometer for each group. For edge chipping, specimens were adhered to a resin bed created in …

Identifying Optimal Composite Resin Depth To Maximize Fracture Resistance When Restoring Immature Endodontically Treated Teeth, David Poe

Master's Theses (2009 -)

Introduction: This study compared stress distribution of an immature central incisor restored with intracanal composite resin placed at different depths. Methods: Five pre-accessed models were prepared, to simulate immature central incisors, and endodontically treated using a mineral trioxide aggregate plug and different amounts of composite resin with gutta-percha in between the composite resin and mineral trioxide aggregate. (Group 1) Composite resin restored from the cemento-enamel junction, (group 2) composite resin restored from 2 mm apical to the cemento-enamel junction, (group 3) composite resin restored from 4 mm apical to the cemento-enamel junction, (group 4) composite resin restored from the mineral …

Associations Between The Movement Of Hard And Soft Tissues After Orthodontic Proclination Of Incisors, Scott Beard

Master's Theses (2009 -)

Objective: As orthodontic treatment planning has evolved throughout its history, there has been an increased emphasis on the facial soft tissues. Little has been done to study the effects that proclination of the incisors has on the soft tissue profile. The purpose of this study was to 1) determine if there are significant changes of lip projection and shape with proclination of incisors, and 2) determine if there are significant associations between the movement of the hard and soft tissues after proclination of the incisors. The null hypothesis is that there is no statistically different changes and associations between hard …

P53 And Vegf Expression In Human Temporomandibular Joint Discs With Internal Derangement Correlate With Degeneration, Sergio Castorina, C. Lombardo, Paola Castrogiovanni, Giuseppe Musumeci, E. Barbato, Luis Eduardo Almeida, Rosalia Leonardi

School of Dentistry Faculty Research and Publications

No abstract provided.

Oral Manifestations Of Syphilis: A Review Of The Clinical And Histopathologic Characteristics Of A Reemerging Entity With Report Of 19 New Cases, Molly Housley Smith, Richard J. Vargo, Elizabeth Ann Bilodeau, K. Mark Anderson, Anna Trzcinska, Carleigh R. Canterbury, John E. Fantasia, Yeshwant B. Rawal

School of Dentistry Faculty Research and Publications

Background

Syphilis is a sexually-transmitted infectious disease caused by Treponema pallidum. Cases of primary and secondary syphilis are on the rise in the United States, with a 14.4% increase in new cases noted from 2017 to 2018 and an escalation of 71% between the years 2014 and 2018. Fulfilling its nickname of “the great imitator,” oral manifestations of syphilis may mimic a variety of infectious, neoplastic, or immune-mediated processes, both clinically and histopathologically. This large spectrum of appearances can create a diagnostic challenge to the clinician and/or pathologist, leading to delay in diagnosis or misdiagnosis.

Methods

A database of …

Iatrogenic Acid-Induced Gingival Recession During Crown Cementation: A Case Report, Vrisiis Kofina, H. An, Swati Y. Rawal

School of Dentistry Faculty Research and Publications

Accidental contact of various chemicals in dentistry may cause damage to the gingiva. A male patient presented for a full mouth rehabilitation with ceramic crowns. The patient underwent the steps of ceramic crown preparation uneventfully. At the time of crown delivery, cotton rolls were placed in several vestibular areas for isolation. They were regularly changed during different steps of etching and cementation process, which included the use of Multilink Primer B (Ivoclar Vivadent™). On removal of the cotton roll in the area of upper right canine, the gingival tissues appeared blanched and grayish white. The cotton roll was found to …

Precision And Trueness Of Implant Placement With And Without Static Surgical Guides: An In Vitro Study, Arndt Guentsch, Laxmi Sukhtankar, Hongseok An, Paul Luepke

School of Dentistry Faculty Research and Publications

Statement of problem

Malpositioning of implants is one of the main factors leading to hard- and soft-tissue deficiencies. Whether static computer-guided implant placement increases accuracy and prevents malpositioning is unclear.

Purpose

The purpose of this in vitro study was to determine accuracy defined by trueness and precision (according to International Organization for Standardization 5725) of computer-assisted implant surgery (fully guided and partially guided) in comparison with freehand single implant placement.

Material and methods

Implants (n=20) were placed fully guided (sleeve-bone distance of 2, 4, or 6 mm), partially guided (guide used for pilot drill), or free hand in identical replicas …

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) …

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 …

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 …

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 …

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 …

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 …

A 3-Year Retrospective Study Of Traumatic Dental Injuries To The Primary Dentition, Beste Özgür, Gizem Erbaş Ünverdi, H. Cem Güngör, Dennis J. Mctigue, Paul S. Casamassimo

School of Dentistry Faculty Research and Publications

Background/Aims

Traumatic dental injuries (TDIs) in the primary dentition are a significant public health problem, which has been neglected worldwide. Despite its high prevalence, limited studies address this injury. The aim of this study was to determine the characteristics and treatment modalities of TDIs affecting primary teeth, along with accompanying medical co-morbidities and attendance at follow-up appointments.

Material and Methods

This retrospective analysis included all TDIs affecting primary teeth from January 2014 to January 2017. Data abstraction included demographics, time lapse prior to arrival at hospital, trauma etiology, classification of TDIs, soft tissue and supporting bone injuries, medical co-morbidities, emergency …

Microfluidic-Assisted Fabrication Of Reverse Micelle/Plga Hybrid Microspheres For Sustained Vascular Endothelial Growth Factor Delivery, Meisam Omidi, Luis Eduardo Almeida, Lobat Tayebi

School of Dentistry Faculty Research and Publications

In this study, poly (d, l-lactide-co-glycolide) (PLGA) composite microspheres containing anhydrous reverse micelle (R.M.) dipalmitoylphosphatidylcholine (DPPC) nanoparticles loaded vascular endothelial growth factor (VEGF) were produced using microfluidic platforms. The VEGF-loaded R.M. nanoparticles (VRM) were achieved by initial self-assembly and subsequent lipid inversion of the DPPC vesicles. The fabricated VRMs were encapsulated into the PLGA matrix by flow-focusing geometry microfluidic platforms. The encapsulation efficiency, in vitro release profile, and the bioactivity of the produced composite microspheres were investigated. The release study showed that VEGF was slowly released from the PLGA composite microspheres over 28 days with a reduced initial burst (18 …

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

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 …

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) …

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 …

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 …

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 …