Hydrolytic stability of self-etch adhesives bonded to dentin.
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 (muTBS) 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.
Inoue
S
S
Division for General Dentistry, Center for Dental Clinics, Hokkaido University Hospital, Kita 13 Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
Koshiro
K
K
Yoshida
Y
Y
De Munck
J
J
Nagakane
K
K
Suzuki
K
K
Sano
H
H
Van Meerbeek
B
B
D000134:Acid Etching, Dental; D001840:Dental Bonding; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry; D006801:Humans; D006868:Hydrolysis; D008689:Methacrylates / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D009943:Organophosphorus Compounds / Q000737:chemistry; D013499:Surface Properties; D013718:Tensile Strength; D014233:Tricarboxylic Acids / Q000737:chemistry
D017220:Dentin-Bonding Agents; D008689:Methacrylates; D009943:Organophosphorus Compounds; C074232:Phenyl-P adhesion promoting monomer; D014233:Tricarboxylic Acids; C098756:4-methacryloxyethyltrimellitic acid; C069749:methacryloyloxydecyl dihydrogen phosphate; D017886:Durapatite