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

Evren Kilinc

Date of original Performance / Presentation

January 2022

Publication Date / Copyright Date

1-1-2022

Abstract

Brief Background There is limited data on the effects of over-the-counter (OTC) whitening toothpastes (WTs) on the shear bond strength (SBS) of resin composite. Aim: This study assessed the effect of various WTs containing Hydrogen peroxide (HP) or baking soda with peroxide (BS& P) on early and delayed resin-composite bonding compared to regular toothpaste and at-home whitening. Methods: A total of 168 extracted human sound anterior teeth were randomly distributed into seven groups (G1:Colgate® Optic White® Renewal; G2:Colgate® BS&P Whitening Bubbles; G3:Colgate® Cavity Protection; G4:Crest 3D White Brilliance 2 Step; G5:Crest BS& P with Tartar Protection; G6:Crest Cavity Protection; G7:Opalescence PF 15% at-home whitening (Ultradent))(n=24). G1-G6 were brushed for 2,500 cycles (Sabri Dental Enterprises Inc). G7 group was whitened for 4-6 hours/day for 14 days. Then, samples were sub-grouped as 24 hours/early(E) and 7 days/ delayed(D) to bond 2 mm increment of Filtek Supreme (3M/ESPE) with OptiBond FL(Kerr) per manufacturers’ instructions on facial surfaces using Ultradent ShearBond Test System. SBS was measured using a universal testing machine (Instron 8841) at 1 mm/min crosshead speed with a load cell of 1,000 lbs. Failure mode was evaluated using Adhesive Remnant Index under three magnifications using stereomicroscope (Olympus Corporation of the Americas). Results: Overall WTs with added BS affected SBS more. All WTs except G1 had significantly lower SBS than their regular counterparts in E bonded groups (p=.003, =.016,=.05 for G2,4,5 respectively). Delayed bonding significantly increased SBS in G2 and adversely affected regular toothpaste groups(p=.003). At-home whitening performed similarly to WTs other than G5 in delayed SBS(p=.02). The differences between ARI scores were not statistically significant. Conclusion: Within limitations, OTC WTs significantly differed from their regular counterparts at both bonding times. Although WTs may not have differences of clinical significance, more caution is advised in adhesive dentistry, mainly when patients are using BS&P toothpastes.

Disciplines

Dentistry

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