A Study of Resin-enamel Adhesion after Tooth Bleaching by Several Bleaching Agents

DOI 21 References
  • KISHIMOTO Mami
    Department of Operative Dentistry, Field of Study of Biofunctional Recovery and Reconstruction, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
  • SHINNO Yasuo
    Department of Operative Dentistry, Field of Study of Biofunctional Recovery and Reconstruction, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
  • ANABUKI Yuka
    Department of Operative Dentistry, Field of Study of Biofunctional Recovery and Reconstruction, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
  • NAKATA Takashi
    Department of Operative Dentistry, Field of Study of Biofunctional Recovery and Reconstruction, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
  • TANAKA Kumiko
    Department of Operative Dentistry, Field of Study of Biofunctional Recovery and Reconstruction, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
  • NISHITANI Yoshihiro
    Department of Operative Dentistry, Field of Study of Biofunctional Recovery and Reconstruction, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
  • YOSHIYAMA Masahiro
    Department of Operative Dentistry, Field of Study of Biofunctional Recovery and Reconstruction, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences

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Other Title
  • 各種漂白剤処理後のエナメル質に対する接着性の検討

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Abstract

It has been reported that the bond strengths of enamel-resin adhesion reduced after tooth bleaching, although the mechanism remains unclear. The purpose of this study was to evaluate resin-enamel adhesion immediately after tooth bleaching. Shofu Hi-Lite® (Shofu, HL), Pyreness® (Mitsubishi Gas Chemistry, PY), and Shofu Hi-Lite Shade up® (Shofu, SU) were used in this study. Non-caries human extracted teeth were used. Bleaching agents were applied on the enamel according to the manufacturers' instructions. Specimens were divided into eight groups as follows: no bleaching with/without etching as controls, HL with/without etching, PY with/ without etching and SU with/without etching. After bleaching, the tooth surfaces were subjected to the 2-step self-etching adhesive system (Clearfil Mega Bond®, Kuraray Medical) and then were built up with resin composites (Clearfil AP-X® A3, Kuraray Medical). After storage for 24h in 37℃ distilled water, all specimens were trimmed with a diamond saw under running water (1.0×1.0mm at the bonded surface), and then subjected to a micro-tensile bond test at a crosshead speed of 1.0mm/minute (n=20). Data was analyzed by two-way ANOVA and Tukey's test (p<0.05). Bond strengths after bleaching were significantly decreased compared to the controls. There were no significant differences between PY and SU, but HL was significantly higher than PY and SU. The pH of HL was lower than that of other agents, so it is suggested that the bond strength of HL was not drastically decreased because the enamel surface was made rough. However, the bleaching effect was the same as that of the no-etching groups. From the results of this study, it is concluded that the bond strengths between resin and enamel were reduced after bleaching, and the rate of decrease in bond strength might depend on the type of bleaching agent.

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