Student Theses, Dissertations and Capstones

Document Type

Thesis - NSU Access Only

Degree Name

Master of Science (M.S.) in Dentistry

Copyright Statement

All rights reserved. This publication is intended for use solely by faculty, students, and staff of Nova Southeastern University. No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, now known or later developed, including but not limited to photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author or the publisher.

Department

College of Dental Medicine

First Advisor

Chin-Yu Lin

Date of original Performance / Presentation

January 2024

Publication Date / Copyright Date

1-1-2024

Abstract

Objectives: The purpose of this study was to understand whether there is different resistance to sliding of different brackets within the same bracket system and whether there is an association between bracket slot width and resistance to sliding. Background: Bracket design contributes to resistance to sliding, including bracket width. There is inconclusive evidence in the literature of the resistance to sliding as bracket slot width changes. Knowledge of the resistance to sliding generated as bracket width changes and that of different brackets within the same system is necessary to deliver appropriate forces for orthodontic tooth movement. Methods: For this experiment, four groups of 022 slot size brackets, maxillary central incisor, maxillary lateral incisor, maxillary canine, maxillary premolar were used. Three-bracket system was constructed to test resistance to sliding by bonding three brackets on a customized holder at the distance of 8 mm between the centers of neighboring brackets. Each group was set in the active and passive configuration. Maximum resistance to sliding and average resistance to sliding were recorded. The data was analyzed with a two-way ANOVA, linear regressions, and post-hoc Tukey analysis. Results: According to the two-way ANOVA analysis, bracket type, configuration and their interaction played a significant role in maximum resistance to sliding and average resistance to sliding. Brackets configured in the active configuration experienced a higher resistance to sliding compared to those in the passive configuration. Based on the linear regression models, bracket width is a significant factor in resistance to sliding in the active and passive configuration with maximum resistance to sliding, and active configuration with average resistance to sliding. In the active configuration, there is a positive and linear relation between bracket slot width and resistance to sliding. Post-hoc Tukey shows that maxillary premolar brackets generally experienced less resistance to sliding compared to maxillary central incisor brackets, maxillary lateral incisor brackets, and maxillary canine brackets. Conclusions: In all tested brackets, those in the active configuration experienced a higher resistance to sliding compared to those in the passive configuration. A positive and linear correlation between bracket slot width and resistance to sliding, in both the active and passive configurations. Bracket type, the configuration and their interaction play a significant role in resistance to sliding.

Disciplines

Dentistry

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