Date of Award

Summer 2018

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Dentistry

First Advisor

Berzins, David

Second Advisor

Ostertag, Alan

Third Advisor

Liu, Dawei

Abstract

Introduction: Sealants are used in orthodontics to help prevent demineralization during treatment. The objective of this study was to determine if there is a difference in the shear bond strength (SBS) between two different resin sealants bonded to teeth. Materials and Methods: Extracted human premolars (n=20/group) were randomly divided and prepared by acid etching, followed by application of primer or sealant. Group 1, the control group, used Transbond XT Primer (3M Unitek). Groups 2 and 3 were prepared with the sealants L.E.D. Pro Seal (Reliance Orthodontic Products) and Opal Seal (Opal Orthodontics) respectively. Transbond XT Adhesive was applied to a stainless steel bracket and bonded to each tooth. Each group was stored in distilled water at 37oC for 48 hours prior to debonding. Shear bond strength (SBS) was measured via a universal testing machine, and the Adhesive Remnant Index (ARI) was scored. Results: The SBS (MPa) of the groups were as follows: Group 1 (Transbond): 20.1 ± 6.0; Group 2 (Pro Seal): 16.5 ± 4.8; and Group 3 (Opal Seal): 15.7 ± 3.9. The SBS with Transbond XT Primer was significantly greater than Opal Seal (P < 0.05/ANOVA-Tukey), while Pro Seal and Opal Seal sealants were not significantly different from each other (P > 0.05). The Opal Seal group had significantly greater ARI scores, indicating more adhesive remained on the teeth after debonding. Conclusion: Opal Seal and Pro Seal sealants have similar SBS but generally exhibit lower bond strengths compared to the use of an adhesive primer.

Available for download on Wednesday, August 28, 2019

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