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

Cristina Garcia-Godoy

Date of original Performance / Presentation

January 2019

Publication Date / Copyright Date

1-1-2019

Abstract

Abstract THE EFFECT OF OVER THE COUNTER FLOURIDE MOUTHWASHES ON STAINLESS STEEL SELF-LIGATING ORTHODONTIC BRACKETS: AN IN VITRO STUDY Introduction: Corrosion of orthodontic appliances has been shown to affect the efficiency of orthodontic brackets and can lead to weakening and/or failure of the appliance. The acidity of the oral environment and fluoride have been shown to increase the corrosion of orthodontic brackets which releases metal ions in the oral cavity. Minimizing the potential of corrosion is essential for efficient orthodontic treatment. The purpose of this study is to evaluate and compare the effects of over the counter fluoride mouthwashes on the amount of ion release and the change in surface characteristics of stainless steel self-ligating orthodontic brackets. Methods: One hundred and forty mandibular premolar stainless steel self-ligating were used in the study. The brackets were divided into seven groups and immersed in their assigned solution: Act Anticavity Fluoride Mouthwash, Listerine Total Care Anticavity Mouthwash, Colgate PreviDent Dental Rinse, Listerine Antiseptic Mouthwash, aqueous solution with a pH of 3.5, 0.05% NaF solution, and distilled deionized water. The brackets were immersed in 60mL of their assigned solution and stored in an incubator set at 37° C for 45 days. After 45 days, the amount of ion release of nickel, chromium, and iron from each solution was tested using an atomic absorption spectrophotometer. One randomly selected bracket from the manufacturer’s package and one randomly selected bracket from each group were evaluated under scanning electron microscopy (SEM) to analyze bracket surface morphological changes after the test. Results: Descriptive statistics were done on the weight of the brackets of each group, the pH of the solutions, and the amount of ion release for each solution. There was a significant change in weight in the Listerine Total Care group and the ACT group. The NaF solution had the highest average pH and Listerine Total Care had the lowest average pH. There was a significant change in pH in the Listerine Total Care group, the pH 3.5 solution group, and the Listerine Antiseptic group. A general linear model ANOVA was used to evaluate the ion release and to provide comparisons between each group. For Chromium ion, the highest average release was seen in the NaF solution and the lowest was seen in the ACT solution. For Nickel ion, the highest average release was seen in the Listerine Total Care solution and the lowest was seen in the NaF solution. For Iron ion, the highest average release was seen in the Listerine Total Care solution and the lowest was seen in the control group distilled water. SEM evaluation revealed that the highest scores were given to Listerine Total Care bracket slot, Listerine Antiseptic bracket slot, and pH 3.5 bracket slot. Conclusions: The results of this study reveal that fluoride mouthwashes, with higher acidity, can cause more corrosion of orthodontic brackets than mouthwashes with lower acidity. It is important for the orthodontist to choose a rinse with a higher pH value to minimize the corrosion potential and for the orthodontist to understand the effect of the hygiene products on the orthodontic appliances.

Disciplines

Dentistry

Keywords

Orthodontics

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