Hydrolytic Stability of Self-etch Adhesives Bonded to Dentin

• Published in: Journal of dental research 2005-12, Vol.84 (12), p.1160-1164
• Main Authors: Inoue, S., Koshiro, K., Yoshida, Y., De Munck, J., Nagakane, K., Suzuki, K., Sano, H., Van Meerbeek, B.
• Format: Article
• Language: English
• Subjects: Acid Etching, Dental; Dental Bonding; Dentin - ultrastructure; Dentin-Bonding Agents - chemistry; Dentistry; Durapatite - chemistry; Humans; Hydrolysis; Methacrylates - chemistry; Microscopy, Electron, Transmission; Organophosphorus Compounds - chemistry; Surface Properties; Tensile Strength; Tricarboxylic Acids - chemistry
• ISSN: 0022-0345; 1544-0591
• DOI: 10.1177/154405910508401213

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.