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

ABSTRACT Objectives: The objective of this study was to compare the resistance to sliding of an arch-wire passing through stainless-steel, ceramic, and plastic three-bracket systems at various sliding distances. Background: Resistance to sliding (RS) is the major impedance to orthodontic tooth movement when an orthodontic wire slides through a bracket slot. Past literature has focused on the affects that resistance to sliding has on altering the surface properties of wires, but few have investigated the change in bracket slot properties, such as RS, during sliding mechanics. The material properties of stainless-steel, ceramic, and plastic brackets influence the RS differently and affect the biomechanical design of orthodontic appliances. Materials and Methods: RS of the bracket groups was measured by sliding a segment of 0.019”x0.025” stainless-steel (SS) wire through a 0.022-inch slot in a three-bracket system. Total sample size n = 96 was equally distributed into three groups of metal, ceramic, and plastic brackets. The wires were pulled at pre-set distances of 0mm, 2mm, 4mm, and 6mm. After the brackets were subjected to the experimental conditions, a new 0.019”x0.025” SS wire was ligated and pulled for the measurement of the maximal (MRS) and average resistance to sliding (ARS). The data was then analyzed with a two-way ANOVA of the two independent variables (bracket material and sliding distance) and post-hoc Tukey analysis. Results: According to the results of two-way ANOVA, only bracket type, not sliding distance or interaction between the two independent variables, played a significant role in resistance to sliding in MRS and ARS. At all four sliding distances there was a significant difference in MRS and ARS values when comparing metal to ceramic brackets and when comparing ceramic to plastic brackets, with ceramic brackets having the highest MRS and ARS values. At all four sliding distances, metal and plastic brackets behaved similarly with no statistical difference in MRS and ARS values. Conclusions: 1) A sliding distance of up to 6mm does not have a significant effect on the MRS and ARS values when brackets are engaging with the arch-wire in an active configuration 2) In sliding mechanics, stainless-steel and plastic brackets have similar RS while ceramic brackets have a statistically significant larger RS 3) In the clinic, plastic brackets may be a better esthetic alternative to metal or ceramic brackets in consideration of RS.

Disciplines

Dentistry

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