1. Resin Bonding of Self-Etch Adhesives to Bovine Dentin Bleached from Pulp Chamber.
- Author
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Haruyama A, Kameyama A, Kato J, Takemoto S, Oda Y, Kawada E, Takahashi T, and Furusawa M
- Subjects
- Animals, Cattle, Hydrogen Peroxide pharmacology, Titanium pharmacology, Dental Cements pharmacology, Dental Pulp Cavity drug effects, Dentin drug effects, Resin Cements pharmacology, Tooth drug effects, Tooth Bleaching Agents pharmacology
- Abstract
This study evaluated the microtensile bond strength ( μ TBS) of 1-step self-etch adhesives (1-SEAs) and 2-step self-etch adhesives (2-SEAs) to pulp chamber dentin immediately after bleaching with 2 types of common bleaching techniques. Pulp chamber dentin of bovine teeth was bleached using 30% hydrogen peroxide (H
2 O2 ) solution with quartz-tungsten-halogen light-curing unit (Group 1) and 3.5% H2 O2 -containing titanium dioxide (TiO2 ) (Pyrenees®) activated with 405-nm violet diode laser for 15 min (Group 2). Unbleached specimens were placed in distilled water for 15 min and used as controls. After treatment, dentin was bonded with resin composite using 1-SEA or 2-SEA and stored in water at 37°C for 24 h. Each specimen was sectioned and trimmed to an hourglass-shape and μ TBS was measured. Fractured specimens were examined under a scanning electron microscope to determine fracture modes. All specimens in Group 1 failed before proper bonding tests. In Group 2, the μ TBS of 2-SEA was significantly greater (with no failed specimens) than 1-SEA (where 21 out of 36 failed). These results indicate that 2-SEA is a better adhesive system than 1-SEA on bleached dentin. Our results also demonstrated that application of H2 O2 significantly decreases bond strength of resin to dentin; however, in the case of nonvital tooth bleaching, Pyrenees® is a better alternative to the conventional 30% H2 O2 bleaching., Competing Interests: The authors have no financial relation to any of the companies whose products are included in this article.- Published
- 2016
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