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 Godoy

Date of original Performance / Presentation

January 2021

Publication Date / Copyright Date

1-1-2021

Abstract

Objective: to evaluate the efficacy of 40% sodium ascorbate (SA) in restoring the shear bond strength (SBS) of enamel immediately after bleaching with 40% hydrogen peroxide. Methods: Twenty-five anterior bovine teeth were collected and tested. Teeth were divided into five different groups (n=5). Group 1 (Negative Control, restoration only); Group 2 (Bleaching + 1-week delayed bonding, Standard of Care); Group 3 (Bleaching + immediate bonding); Group 4 (Bleaching + 40% SA + 1-week delayed bonding); and Group 5 (Bleaching + 40% SA + immediate bonding). Teeth in the delayed restoration groups (2&4) were stored in deionized water at 37C, after being submitted to bleaching, following manufacturer’s instructions. Four cylindrical tubes were fabricated per tooth using Filtek Supreme Ultra Universal Composite (3M, St. Paul, MN, USA) and bonded to the enamel of bovine teeth using OptiBond FL (Kerr, Orange, CA, USA) giving a total of 100 specimens with a 3mm diameter and a 3mm height each. SBS was measured using a universal testing machine (Instron model 8841, Instron, Canton, MA), a blade was placed perpendicular at teeth/composite interface and force was applied at a crosshead speed of 0.5mm/min and then statistically analyzed (Kruskal-Wallis, Dunn’s, p<0.05). Results: There was a significant difference in SBS between groups 1,2,4 and 3,5; whereas no significant difference was found between groups 3 and 5. Conclusion: SBS did not improve after application of 40% SA in the bleaching and immediate bonding group (Group 3), however, a significant improvement was noticed in group 4 where 40% SA was applied after bleaching with a 1-week delay in bonding. Grants: This study was funded by The Health Professions Division, Nova Southeastern University.

Disciplines

Dentistry

Keywords

Bleaching; Bonding; Hydrogen Peroxide; Shear Bond Strength; Sodium Ascorbate

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