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

Jeffrey Thompson

Date of original Performance / Presentation

January 2021

Publication Date / Copyright Date

1-1-2021

Abstract

Introduction: The aim of this study is to compare the resistance to sliding (RS) of novel TiNbTaZr (Gummetal®) wires to stainless steel (SS) wires in conventional twin brackets at active and passive bracket angulations in wet and dry conditions. Background: Previous studies of orthodontic archwires have demonstrated the extent of resistance to sliding that is created during sliding mechanics. Such studies have focused on comparisons among archwires of varying dimension or material composition. TiNbTaZr is a relatively new titanium alloy wire that has recently become popular under the brand name Gummetal® (GM). Gummetal® has been reported to have all of the characteristics of an ideal orthodontic wire.14 In limited studies, it has been claimed that the resistance to sliding of Gunmetal is 50% that of traditional titanium alloys. 1,2 However, to our knowledge, studies have not yet examined the resistance to sliding exhibited by Gummetal® in active or passive configurations. Methods: Samples of 0.04826 x 0.0635 mm (19x25 in), 5cm in length, rectangular GM and SS wire were stratified into wet or dry test condition groups and further into active or passive configuration test sub-groups. The samples in the wet condition were sprayed with deionized water during testing. Three standard twin edgewise brackets were mounted on a custom bracket-wire-holder apparatus; the middle bracket’s slot was angled at 0 degrees for a passive configuration or 3 degrees for an active configuration. A subset of the samples underwent surface characterization using SEM and stylus profilometry before and after frictional testing. Each sample was pulled at a sliding velocity of 5 mm/min using a universal testing machine (Instron 8841, Canton, MA). The average resistance to sliding (ARS) and maximum resistance to sliding (MRS) was recorded. Descriptive statistics were provided for both ARS and MRS. A three-way ANOVA was used to describe the effect of wire material, bracket angulations, and moisture state on ARS and MRS. A Tukey pairwise comparison examined the effect wire type has on MRS and ARS in the various combinations of condition and bracket angulation. Results: The results indicated that wire type does not have a significant effect on ARS or MRS values between GM and SS wires, with the exception of a significant effect on MRS in the dry state in active configuration. There was a statistically significant difference in ARS and MRS values for both wire types when comparing active and passive configurations. Conclusions: Resistance to sliding was not statistically significantly different between SS and GM wires when comparing them in the active,wet configuration in this study. Due to limited studies available, SS remains the standard wire for efficient sliding mechanics, even though GM does show promise.

Disciplines

Dentistry

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