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Hydrolytic Stability of Self-etch Adhesives Bonded to Dentin

¹ Division for General Dentistry, Center for Dental Clinics, Hokkaido University Hospital, Kita 13 Nishi 7, Kita-ku, Sapporo 060-8586, Japan;
² Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Kapucijnenvoer 7, B-3000 Leuven, Belgium;
³ Department of Conservative Dentistry, Hokkaido University Graduate School of Dental Medicine, Kita 13 Nishi 7, Kita-ku, Sapporo 060-8586, Japan;
⁴ Department of Biomaterials, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Science, and Research Center for Biomedical Engineering, Okayama University, 2-5-1 Shikata-cho, Okayama 700-8525, Japan; and
⁵ Department of Biomaterials Science, Hiroshima University Graduate School of Dentistry, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan;

^* corresponding author, bart.vanmeerbeek{at}med.kuleuven.ac.be

Functional monomers chemically interact with hydroxyapatite that remains within submicron hybrid layers produced by mild self-etch adhesives. The functional monomer 10-MDP interacts most intensively with hydroxyapatite, and its calcium salt appeared most hydrolytically stable, as compared with 4-MET and phenyl-P. We investigated the hypothesis that additional chemical interaction of self-etch adhesives improves bond stability. The micro-tensile bond strength (µTBS) of the 10-MDP-based adhesive did not decrease significantly after 100,000 cycles, but did after 50,000 and 30,000 cycles, respectively, for the 4-MET-based and the phenyl-P-based adhesives. Likewise, the interfacial ultrastructure was unchanged after 100,000 thermocycles for the 10-MDP-based adhesive, while that of both the 4-MET- and phenyl-P-based adhesives contained voids and less-defined collagen. The findings of this study support the concept that long-term durability of adhesive-dentin bonds depends on the chemical bonding potential of the functional monomer.

KEY WORDS: hydrolytic stability • self-etch adhesive • durability • functional monomer • dentin

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