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Microtensile Bond Strength of Thermally Stressed Composite-Dentin Bonds Mediated by One-Bottle Adhesives

Published

Author(s)

B Xie, Sabine H. Dickens, Anthony A. Giuseppetti

Abstract

Purpose:To evaluate the effects of thermally stressing composite-dentin bonds in teeth subjected to a modified microtensile bond test that allowed application of two bonding agents side-by-side to the same tooth. Materials and Methods: Extracted human molars with a slot dissecting the occlusal dentin surface were conditioned and primed on one side with Prime & Bond NT (PBNT) and Prime One Mirage (P-One) on the other side. The composite was light-cured onto the surface. Approximately 0.5 mm thick dumbbell-shaped tensile specimens were tested after 24-hour water storage or after thermocycling 2400 times at 5 and 55 C. Interfacial morphologies were evaluated by scanning electron microscopy (SEM). Results: Mean tensile bond strengths (TBS standard deviation) were (36 24 Mpa and 31 16 Mpa) for PBNT, and (51 25 Mpa and 40 18 Mpa) for P-One without and with thermocycling, respectively, 97% of all tested specimens failed adhesively. Differences between the bonding systems and the thermal treatments were significant (two-way ANOVA, P< 0.05). Regression analysis showed regional correlation between mean TBS of each bonding agent when grouped by the teeth from which they were obtained (r=0.66, P=0.002). SEM revealed that both bonding agents effectively wetted the conditioned dentin producing a typical hybrid layer, surface-textured resin tags with multiple lateral branches.
Citation
American Journal of Dentistry
Volume
15
Issue
No. 3

Keywords

dentin bonding, dentin cohesive strength, microtensile bond test, thermocycling

Citation

Xie, B. , Dickens, S. and Giuseppetti, A. (2002), Microtensile Bond Strength of Thermally Stressed Composite-Dentin Bonds Mediated by One-Bottle Adhesives, American Journal of Dentistry (Accessed April 19, 2024)
Created May 31, 2002, Updated October 12, 2021