Effect of titanium dioxide and 3.5% hydrogen peroxide with 405-nm diode laser irradiation on bonding of resin to pulp chamber dentin |
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Authors: | A Haruyama J Kato A Kameyama Y Hirai and Y Oda |
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Institution: | 1.Department of Dental Materials Science, Tokyo Dental College, 1-2-2, Masago, Mihama-ku, Chiba, 261-8502, Japan ;2.Department of Operative Dentistry, Tokyo Dental College, 1-2-2, Masago, Mihama-ku, Chiba, 261-8502, Japan ; |
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Abstract: | This study was conducted to determine the effect of a 3.5% hydrogen peroxide solution containing titanium dioxide on bonding
of resin to pulp chamber dentin. Extracted bovine anterior teeth were allocated to three groups of ten teeth each. The coronal
labial pulp chamber dentin was exposed and bleached with 3.5% hydrogen peroxide with titanium dioxide with 405-nm diode laser
irradiation for 15 min (Group 1); 30% hydrogen peroxide with halogen lamp irradiation for 15 min (Group 2); and distilled
water for 15 min (Group 3). After bleaching, the pulp chamber dentin was prepared for composite resin bonding and the interface
between the resin and dentin was observed by scanning electron microscopy. The microtensile bond strength (μTBS) and failure
patterns were determined. The μTBS values (mean ± SD) were: 17.28 ± 5.79 MPa (n = 36), 0 MPa, and 26.50 ± 9.83 MPa (n = 36) in Groups 1, 2, and 3, respectively. The μTBS in Group 3 was significantly higher than that in Group 1 (P < 0.05). Hybrid layers and resin tags were clearly observed at the interface in Groups 1 and 3, but not in Group 2. Adhesive
failure was mainly observed in Group 1, whereas dentin failure was the main failure pattern in Group 3. |
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