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Degradation-stage Effect of Self-etching Primer on Dentin Bond Durability

¹ Department of Crown Bridge Prosthodontics, Nihon University School of Dentistry at Matsudo, 870-1 Sakaecho, Nishi 2, Matsudo, Chiba 271-8587, Japan;
² Department of Dental Caries Control and Aesthetic Dentistry, Nihon University School of Dentistry at Matsudo, 870-1 Sakaecho, Nishi 2, Matsudo, Chiba 271-8587, Japan;
³ Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo, 870-1 Sakaecho, Nishi 2, Matsudo, Chiba 271-8587, Japan; and
⁴ Department of Biomaterials, Okayama University, Graduate School of Medicine and Dentistry, 2-5-1 Shikadacho, Okayama, Okayama 700-8525, Japan

Correspondence: ^* aida.masahiro{at}nihon-u.ac.jp

It is well-known that self-etching primers can be altered. However, the effects from altered primers on the dentin bond durability have yet to be thoroughly identified. In this study, we examined the effects from 5 altered Liquid A primers in different stages of degradation—where 2-hydroxyethylmethacrylate (HEMA) and 10-methacryloyloxydecyl dihydrogen phosphate (MDP), used in Liquid A primers, were altered by the hydrolysis of the methacryloxy ester portion in the HEMA and MDP—on the hybrid layer’s quality and dentin bond durability. The hypothesis was that degradation stages of altered Liquid A primers have no effect on the hybrid layer’s quality and on dentin bond durability. Bond strengths, obtained after thermo-cycling, were strongly dependent on the degradation stage of the altered Liquid A primer. Alterations of self-etching primers reduced dentin bond durability and decreased the created hybrid layer’s quality.

Key Words: self-etching primer • degradation • dentin bond durability • aging • core resin

Journal of Dental Research, Vol. 88, No. 5, 443-448 (2009)
DOI: 10.1177/0022034509337146


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