Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 131 for “"Brackets"”.
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The Fracture Strength of Ceramic Brackets : A Comparative Study
… methods on the fracture strength of ceramic brackets and the yield strength of metal brackets.</p> <p>Ceramic brackets followed the Griffith model, which was used to interpret their fracture strength with respect to their surface condition. With surface damage (scratching), their fracture …
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Reconstrucción 3D y análisis de rugosidades mediante esteromicroscopía en brackets dentales
… las zonas de apoyo del arco en las aletas de las brackets. En la mayoría de estudios publicados hasta el momento (12-15), las líneas principales de investigación se basan en el comportamiento del binomio arco - slot y los factores que afectan este comportamiento, como son las rugosidades que …
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Investigation of frictional resistance on orthodontic brackets when subjected to variable moments
… effects on friction. Friction of self-ligating brackets were also compared to stainless steel and ceramic brackets. Six archwires were combined with four brackets. Friction (static, kinetic and dynamic) and load (dynamic and apparent stiffness) were measured. Dynamic friction was the frictional …
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Aspects of Generalized Geometry: Branes with Boundary, Blow-ups, Brackets and Bundles
… The second part of this thesis studies Dorfman brackets, a generalisation of the Courant- Dorfman bracket, within the framework of double vector bundles. We prove that every Dorfman bracket can be viewed as a restriction of the Courant-Dorfman bracket on the standard VB-Courant algebroid, which …
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In vitro investigation into bond strength of metal and ceramic orthodontic brackets
… bond strength of metal and ceramic orthodontic brackets when using etch and separate primer, or self-etching primer (SEP) 2. To assess remaining adhesive following removal of orthodontic bracket METHOD: 180 previously extracted teeth were randomly allocated to one of six test groups. Each was …
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Tensile Bond Strength of Light-Activated Composite for Bonding Metal and Ceramic Brackets
… two-paste adhesive for bonding ceramic and metal brackets. Manufacturer recommended light-activation times were evaluated using hardness as an indicator of cure. Light-activated composite specimens 0.3 mm in thickness were cured beneath metal brackets for 30 seconds and ceramic brackets for 10 …
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Intraoral Corrosion of Self-ligating Metallic Brackets and Archwires and the Effect on Friction
… microscopic qualitative analysis. Orthodontic brackets and 0.019 x 0.025 inch stainless steel archwires were collected and divided into three groups of n=10: used bracket and used wires (UBUW), used brackets and new wires (UBNW), and new brackets and new wires (NBNW). ‘New’ materials were …
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The Effect of Pre-Cure Bracket Movement on the Shear Bond Strength of Metal Brackets
… strength of bracket movement after seating the brackets and before light curing has not been reported. The purpose of this study was to determine the effect of linear and rotational pre-cure bracket movement on the shear bond strength of orthodontic brackets. 100 extracted human maxillary …
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Clinical Evaluation of Glass Ionomer Cement as an Adhesive for the Bonding of Orthodontic Brackets
… a significant difference in the failure rate of brackets attached to teeth using a glass ionomer cement, Ketac-fil, and the failure rate of brackets attached to teeth using a conventional orthodontic adhesive system, Rely-a-bond. Six patients in the Department of Orthodontics at Indiana …
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Die Schaffung retentiver Strukturen im Zahnschmelz mittels Er, Cr:YSGG-Laser : unter Berücksichtigung der Befestigung kieferorthopädischer Brackets
The aim of the present study was to examine, if it is possible to create retentive structures on dental enamel by means of an Er,Cr:YSGG laser (( = 2790 nm). As reference procedure thereby the conventional acid etching technique served. The results were judged particularly on an orthodontical …
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EFFECT OF OVER THE COUNTER WHITENING ON THE SHEAR BOND STRENGTH OF ORTHODONTIC BRACKETS: AN IN-VITRO STUDY
… on the shear bond strength of orthodontic brackets bonded to human premolar teeth with composite resin. Objectives: To assess: 1) The effects of over-the-counter white strip enamel bleaching and 2-Step whitening toothpaste application on the shear bond strength of orthodontic brackets 2) …
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Estudio in vitro de los efectos del arenado del bracket metálico previo a la adhesión sobre su resistencia al desalojo
La adhesión de los brackets metálicos ha sido motivo de estudio desde que se inició la era de las resinas epóxicas para adherir brackets al esmalte dental. La resistencia al desalojo de los brackets metálicos al esmalte dental es de vital importancia tanto para el ortodoncista como para el paciente …
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Effect of Delayed Polymerization Time and Bracket Manipulation on Orthodontic Bracket Bonding
… of resin composite conversion. Orthodontics brackets were bonded to extracted third molars in a simulated oral environment after a set period of delayed polymerization time and bracket manipulation. After curing the bracket adhesive, each bracket underwent shear bond strength testing followed …
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Clinical Acceptability of Digital Indirect Bonding Compared to Direct Bonding by Varying Orthodontic Experience: Pilot Study
… The tooth type where clinically unacceptable brackets were located was also identified. The results of this study suggest that, regardless of orthodontic experience, the percentage of clinically acceptable brackets placed was significantly higher when performed using the digital indirect …
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The effect of simulated oral and clinical conditions on the fracture strength of ceramic bracket tie-wings
… bracket. Fracture strength was measured for brackets as-received (control) and after 7- or 21-day exposure to phosphate buffered saline solution (PBS) with or without repetitive ligation. Scanning electron microscopy was used for qualitative evaluation of the fractured brackets. Based on a …
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