Medicine and Health Sciences Commons^™

Evaluation Of Frictional Forces Between Brackets Of Different Types At Various Angulations And An Arch Wire: With And Without Pulsating Vibration, Benjamin M. Christman

Student Theses, Dissertations and Capstones

Objective: The objective of this study was to determine the effect of pulsating vibration on the sliding resistance between orthodontic brackets and stainless steel wires. Brackets were placed at two different angulations (0° and 5°) to simulate leveling of a tipped tooth during tooth movement. Pulsating vibration was delivered via the AcceleDent device.

Background: Friction is defined as a force that retards or resists the relative motion of two objects in contact, and its direction is tangential to the common boundary of the two surfaces in contact. This has been of interest to the orthodontist since the mid-20th century. Since …

Assessing Orthodontic-Bracket Impacts On Lip Profile At Bonding And Debonding Stages, Martin Trockel

Student Theses, Dissertations and Capstones

Introduction: One factor that contributes greatly to the lower face appearance and orthodontists have the ability to affect is lip profile. Clinical assessment of the lip profile is an important element in the decision of orthodontic treatment planning and in the evaluation of treatment progress and outcome. Three known factors influence the lip profile; the lip thickness, the underlying bone, and the tooth position. The positions and inclinations of the anterior teeth can affect the lip position, but it is unclear whether orthodontic brackets bonded to the labial surface of anterior teeth move the lip position and thereafter change the …

Effects Of Sodium Hypochlorite On Enamel Composition, Sonni Pellillo

Student Theses, Dissertations and Capstones

The purpose of this study was to evaluate the effects of sodium hypochlorite on the organic and inorganic composition of enamel. Background: With the advent of enamel bonding for orthodontic appliances in the late 1970s, it has been shown that traditional phosphoric acid etching affects the inorganic portion of the enamel.1, 2 In an attempt to enhance the acid etching pattern and, furthermore, the bond strength, additional pretreatment techniques that target the organic components of the enamel biofilm have been proposed. One such method is the non-invasive enamel pretreatment with 5.25% sodium hypochlorite (NaOCl) prior to phosphoric acid etching.3, 4 …

Color Of Porcelain Veneer After Final Cementation In Comparison To Try-In Paste And Permanent Cement: An In Vitro Study, Abdulelah Aldahlawi

Student Theses, Dissertations and Capstones

Objectives: To evaluate and compare the color of porcelain veneers with try-in paste in relation to porcelain veneers with permanent cement. Also, to evaluate and compare combinations of three different shades and thicknesses of porcelain veneers and three cement shades before and after final cementation. Additionally, to evaluate and compare the color of porcelain veneers with cured permanent cement before and after aging. Background: Porcelain veneers and ceramic restorations have become one of the most popular approaches in the anterior area due to their natural appearance and esthetics. However, more conservative approaches have led to thinner restorations with increased translucency. …

Ex Vivo Effects Of An Orthodontic-Specific Bleaching System On Tooth Color And Existing Bracket Bonding, Kirk James Bean

Student Theses, Dissertations and Capstones

Objective: The purpose of this ex vivo study was to assess the changes in tooth color and existing orthodontic bracket bonding when exposed to a bleaching agent. Methods: 120 freshly extracted human premolars were equally divided into 4 groups: a negative-control group, a positive-control bleaching group, a bracket-bonded group, and a bracket bonded-bleached group. The bleaching protocol was carried out as recommended by the manufacturer of Opalescence Go® – 30 minutes each day for 10 consecutive days. The color value of each tooth was measured daily by spectrophotometry for the negative-control group and the positive-control bleaching group in 6 different …

Adjunctive Appliance Wear And Gender Affect Patients' Oral Health-Related Quality Of Life During The Late Stage Of Orthodontic Treatment In Adolescents, Monica Dinh

Student Theses, Dissertations and Capstones

Objective: This study was conducted to determine how oral health-related quality of life (OHQoL) changes during the late stage of comprehensive fixed orthodontic treatment in adolescents and what factors may be involved. Background: Completion of orthodontic treatment has been shown to improve patients’ OHQoL due to the changes in esthetics, function and emotional well-being. The levels of OHQoL fluctuate throughout treatment where an initial decrease within the first 6 months occurs followed by an improvement towards patients’ pre-treatment levels. At 18 months of fixed orthodontic treatment, the level is unclear. The aims of this study were to clarify the changes …

Sem Assessment Of The Enamel Surface After Debonding Of Ceramic Brackets, Anuja Kothari

Student Theses, Dissertations and Capstones

Objective: This study was conducted to compare the shear bond strengths, patterns of bond failure and enamel surfaces after debonding two ceramic brackets (ClearVu and Radiance Plus) and one standard metal bracket (Mini Uni-Twin). Background: Ceramic brackets are an esthetic alternative to metal brackets. The mean shear bond strength of ceramic brackets is significantly greater than for metal brackets. Excessive bond strength can result in pain upon debonding, damage to the bracket or permanent damage to the enamel including flaking, cracks or tooth fracture. Numerous studies have evaluated techniques to reduce the risk of enamel damage when debonding ceramic brackets, …

Current Clinical And Curricula Experiences Of Postgraduate Pediatric Dentistry Programs On Non-Iv Conscious Sedation In The United States, Aline Morin

Student Theses, Dissertations and Capstones

Purpose: The aims of this study were to: (1) evaluate the prevalence of compliance of Postgraduate Pediatric Dentistry Programs (PPDPs) in the United States with the current American Academy of Pediatric Dentistry (AAPD) sedation guidelines and Commission On Dental Accreditation (CODA) sedation curriculum requirements and identify barriers to and facilitators for implementation of such guidelines; (2) identify changes to-date in sedation practices of PPDP since the previously published AAPD sedation guidelines (2011); and (3) determine the independent association of compliance of PPDP with program setting. Methods: A 40-item questionnaire was emailed to all postgraduate pediatric dentistry program directors (PPDPDs) of …

Comparing The Efficacy Of Laser Fluorescence And Explorer Examination In Detecting Subgingival Calculus In Vivo, Mark Mccawley

Student Theses, Dissertations and Capstones

This paper investigated the sensitivity, specificity, accuracy, and precision of laser fluorescence and tactile probing for the detection of subgingival calculus. The gold standard for subgingival calculus detection has always been tactile probing. In this study 27 teeth were collected and 108 surfaces investigated, one tooth was excluded (group #13) where no calculus was observed on any surface, and three surfaces because of subgingival root caries to avoid confounding data, which left a total of 101 surfaces of 26 extracted teeth that meet the investigation criteria. The presence of subgingival calculus was observed on 75 tooth surfaces (74.25%). There was …

Dentists' Knowledge, Skills, And Application Of Behavior Guidance Techniques On Adults With Dental Fear And Anxiety, Sarah Moriarty

Student Theses, Dissertations and Capstones

A thesis submitted to the College of Dental Medicine of Nova Southeastern University of the degree of Master of Science in Dentistry.

Goals and objectives. To gather information intended to advocate for increased behavioral sciences integration into dentistry that could directly benefit the pediatric population by easing transitions to other dental specialists or into adult dental care. Furthermore, to facilitate the potential indirect effect of vertical transmission reduction through fearful adults pursuing dental care. Background. Extensive detail is provided regarding; the negative effects of DFA on the patient and practitioner, deficits in the literature on the topic, identification and management …

Microtensile Bond Strength Of Resin-Dentin Bonds Following Application Of A Chemical Collagen Cross-Linker Using Different Dentin Bonding Systems, Bassam Naoraldean Zidane

Student Theses, Dissertations and Capstones

Introduction: The stabilization of dentinal collagen fibers against enzymatic degradation by the use of biocompatible cross-linker agents is of clinical importance for effective dentin bonding to surpass the test of time.

Objective: The present study aims to evaluate and compare the effect of the application of two versions of a desensitizer solution to sound coronal dentin, on the microtensile bond strength (μTBS) of the resin-sound coronal dentin using 4th and 6th generation dentin bonding systems.

Materials and Methods: Extracted human third molars were collected from an unidentified bank of teeth followed by IRB approval. A flat surface of all 12 …

Comparison Of Mechanical And Optical Properties Between Three Different Cad/Cam Materials, Aasem Mutlaq Alhenaki

Student Theses, Dissertations and Capstones

Objective. This study aims to compare several mechanical and optical properties between three different CAD/CAM materials. The properties tested are: flexural strength, modulus of elasticity, hardness, translucency and surface gloss. Background. Typically, CAD/CAM restorations are either ceramic based or resin based. A new resin-ceramic hybrid material has recently been introduced and is thought to combine the advantages of both materials. Methods. Samples were divided into three groups, leucite-reinforced porcelain (IPS Empress CAD), lithium dicilicate (IPS e.max CAD) and resin-ceramic hybrid material (Vita Enamic). Twenty-six bar-shaped specimens were fabricated for each group by cutting standard CAD/CAM blocks. 3-point bending test and …

Effect Of Surface Preparation On The Shear Bond Strength Of Orthodontic Brackets Bonded To Zirconia : An In-Vitro Study, Nathaniel Wieder

Student Theses, Dissertations and Capstones

Objectives: The purpose of this in-vitro study was to evaluate the effects of three different surface preparation methods on the shear bond strength of orthodontic brackets bonded to zirconia and determine the most appropriate method. Methods: 45 zirconia and 30 leucite-reinforced porcelain mandibular premolar crowns were divided into 5 groups and received the following surface preparations: 37% phosphoric acid and non-hydrolyzed silane, 4% hydrofluoric acid and hydrolyzed silane, microetch with 50μ Al ₂ O₃ particles. A universal adhesive primer containing MDP was applied and the brackets were bonded with a bis-GMA composite resin. Shear bond strength (SBS) at bond …

Effect Of 35% Sodium Ascorbate On Microtensile Bond Strength Of Composite Resin Immediately After Bleaching, Eman Ismail

Student Theses, Dissertations and Capstones

Background: Sodium ascorbate has been recently tested to reverse the temporary weakening of composite bonding when its application is done immidiately after bleaching. This study compared the microtensile bond strength of immediate and delayed bonding of composite after bleaching, with and without the application of 35% sodium ascorbate. Objective: to assess the effect of 35% sodium ascorbate (SA) (Sigma-Aldrich Co.) on microtensile bond strength of dentin immediately after bleaching with 35% hydrogen peroxide (Pola Office/SDI). Methods: Twenty-five sound human 3rd molars were collected in order to obtain one hundred twenty five specimens. Teeth were randomly divided into five groups: Grp1 …

Parental Knowledge & Experience Regarding Their Children's Dental Insurance Following Enactment Of The Affordable Care Act, Bianca Hillers

Student Theses, Dissertations and Capstones

Goal and Objectives: The goal of this study is to assess parental knowledge and experience regarding children's dental insurance, following enactment of the Affordable Care Act (ACA). The ACA emphasizes the importance of oral health, making pediatric dental services one of ten essential health benefits. With this major change in health care reform, parents should be equipped to make informed decisions regarding their children's dental care and insurance. Data from the first open enrollment period show lack of true mandate and subsequent lack of compliance to this pediatric dental objective. One of our aims was to assess uptake of pediatric …

Gene Expression Profiles Of Cytokines During Osteogenic Differentiation Of Human Gingiva Derived Mesenchymal Stem Cells, Reem Almashat

Student Theses, Dissertations and Capstones

A thesis submitted to the College of Dental Medicine of Nova Southeastern University of the degree of Master of Science in Dentistry.

Background: Therapeutic management of bone loss in the craniofacial region as a consequence of trauma, surgery or congenital malformations presents a clinical challenge. Mesenchymal stem cells (MSCs), due to their inherent plasticity, are potential candidates for cell based therapies for the repair and reconstruction of craniofacial bone tissue. Guided differentiation of stem cells to osteogenic precursors is marked by spatio-temporally regulation of gene expression profiles including that of transcription factors, cytokines, extracellular matrix proteins, enzymes and several signaling …

Comparison Of The Effectiveness Of Mechanical And Chemical Procedures To Decontaminate Titanium Disks And To Promote Osteoblast Attachment, Flavia Goncalves

Student Theses, Dissertations and Capstones

Objective: This study was conducted to determine the effectiveness of physical and mechanical disinfection of P. gingivalis from implant disks and to evaluate bone cells growth and attachment to the disks. Background. Each year, over three million of Americans replacing missing teeth with dental implants. An inflammatory process around an implant that causes bone loss, characterizes peri-implantitis, first diagnosed in the 1980s. The prevalence is approximately 22%. To date, no treatment protocol of peri-implantitis has been proposed. Methods. 207 implants disks. Four different implant surfaces utilized. Disks were contaminated by p. gingivalis and consequentially disinfected by physical means (spraying prophy …