期刊
DENTAL MATERIALS
卷 17, 期 3, 页码 268-276出版社
ELSEVIER SCI LTD
DOI: 10.1016/S0109-5641(00)00081-6
关键词
microtensile bond test; adhesion; dentin bonding agents; C-factor; storage
资金
- NIDCR NIH HHS [K16 DE00175-11] Funding Source: Medline
Objective: To test the elastic wall concept utilizing adhesive resins of varying stiffness in a low- and high-C-factor cavity design after short- and long-term water storage. Methods: A flat and box-shaped cavity was restored on occlusal dentin with a resin composite using a filled and unfilled adhesive resin from which microtensile specimens with a 0.5 mm(2) cross-sectional area were formed. After storage for 30- and 150-days the microtensile bond strength (mu TBS) was determined in a Zwick materials testing machine and the subsequent debond pathway was examined under scanning electron microscopy. Fisher's exact test was used to determine differences in joint and substrate failure modes and a Weibull regression model with gamma frailties was used to test for differences between failure distributions. Tests for three way and two-way interactions were also completed for storage time, C-factor and adhesive. All tests were at 95% confidence levels. Results: The characteristic strength (TBS degrees) for the Optabond FL adhesive applied on a flat cavity was 47.57 and 20.90 MPa and a box-shaped cavity was 49.26 and 17.49 MPa for short- and long-term storage, respectively, while the corresponding TBS degrees for the unfilled Optibond adhesive on the flat cavity design was 36.93 and 32.68 MPa and in a box-shaped cavity was 32.84 and 15.46 MPa. Combining all groups according to storage time revealed a three-fold increase in the debond pathway including the bottom of the hybrid layer. Significance: Evidence suggests that the durability of the bonded joint is threatened by hydrolysis and the most susceptible region is the bottom half of the hybrid layer and in low C-factor cavity designs a more flexible adhesive resin liner was more durable. (C) 2001 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.
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