Abstract
The purpose of this study was to evaluate the tensile bond strength (TBS) to peroxide-exposed dentin. Furthermore, the effect of ascorbic acid (AA) on the bond strength of peroxide-exposed dentin was investigated. Extracted bovine dentin was exposed to 10% carbamide peroxide, 30% hydrogen peroxide, or distilled water for 30 min, then treated with 10% AA (0, 30, 90, and 180 min), and conditioned with 10% citric acid/3% ferric chloride. The polymethyl-methacrylate (PMMA) rod was bonded to the treated bovine dentin with 4-META/MMA-TBB resin. A minidumbbell-shaped bonded specimen was prepared from these bonded assemblies and the TBS was tested. The fractured surfaces were also observed with a scanning electron microscope. Exposure to peroxide before bonding significantly reduced bond strength. The application of AA to the peroxide-exposed dentin increased bond strength. On the other hand, an adverse effect of AA was found in distilled water-affected dentin. Extended resin fibers were partially seen in the peroxide-exposed dentin. In conclusion, peroxide reduced the bond strength, and the stronger the oxidation, the weaker the obtained bond. Antioxidation with AA recovered the bond strength, and this effect increased the longer the AA was applied.
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Acknowledgements
We would like to thank Mr. Katsumi Tadokoro (Oral Health Science Center, Tokyo Dental College) for technical advice on SEM. We would also like to thank Sun Medical and ATD Japan for providing materials. This study was supported in part by Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan, no. 14571862 (to E. K.) and no. 14571863 (to K. Y.).
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K. Yazaki was formerly affiliated with Department of Pharmacology, Tokyo Dental College, 1-2-2, Masago, Mihama-ku, Chiba 261-8502, Japan. He is now in private practice.
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Nomoto, S., Kameyama, A., Nakazawa, T. et al. Influence of ascorbic acid on bonding of peroxide-affected dentin and 4-META/MMA-TBB resin. Clin Oral Invest 10, 325–330 (2006). https://doi.org/10.1007/s00784-006-0071-2
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DOI: https://doi.org/10.1007/s00784-006-0071-2