Influence of Bonding Surface Area on Bond Strength of Two-step Self-etch System

DOI 25 References
  • TSUBOTA Keishi
    Department of Operative Dentistry, Nihon University School of Dentistry:Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry
  • TAKENAKA Hirotaka
    Department of Operative Dentistry, Nihon University School of Dentistry
  • YOSHIDA Fumi
    Department of Operative Dentistry, Nihon University School of Dentistry
  • NOJIRI Takae
    Department of Operative Dentistry, Nihon University School of Dentistry
  • SHIRATSUCHI Koji
    Department of Operative Dentistry, Nihon University School of Dentistry
  • TAMURA Yukie
    Department of Operative Dentistry, Nihon University School of Dentistry
  • MIYAZAKI Masashi
    Department of Operative Dentistry, Nihon University School of Dentistry:Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry
  • KANAMARU Toshiro
    Kanamaru Dental Clinic
  • WAKAMATSU Hideki
    Wakamatsu Dental Clinic

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Other Title
  • 被着面積の違いが2ステップセルフエッチングプライマーシステムの接着性に及ぼす影響

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Purpose: This study investigated the influence of the bonded surface area on the bond strength of bovine enamel and dentin using two-step self-etch adhesives. Methods: Two-step self-etch systems, OptiBond XTR (Kerr, USA) and Clearfil Mega Bond (Kuraray Noritake Dental), were used with a resin composite, Clearfil AP-X (Kuraray Noritake Dental). Bovine mandibular incisors were mounted in self-curing resin and their facial surfaces were wet ground with #600 silicon carbide (SiC) paper. The enamel and dentin surfaces were then treated according to the manufacturer's instructions. Adhesives were applied, and the resin composites were condensed into molds (2.4 or 4.0 mm in internal diameter), placed onto the tooth surface, and then light activated. Ten samples per test group were shear tested at crosshead speeds of 1.0 mm/min. Bond strength values in MPa were calculated from the peak load at failure divided by the specimen surface area. Two-way ANOVA followed by the Tukey HSD test (α=0.05) were done. The treated enamel and dentin surfaces were observed by scanning electron microscopy and the interfaces of resin and enamel, and dentin were also observed. Results: The bond strength ranged from 17.7 to 41.4 MPa in enamel and from 22.0 to 51.4 MPa in dentin. The bond strengths decreased with increasing bonded surface area. There were no significant differences between OptiBond XTR and Clearfil Mega Bond except for the group of 2.4 mm in dentin. From the SEM observations, the etching effect of self-etch primer was more pronounced in Optibond XTR for the treated enamel and dentin surfaces. Conclusion: The results of this study suggest that surface area affects the shear bond strength of two-step self-etch systems.

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