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In vitro degradation of resin–dentin bonds with one‐bottle self‐etching adhesives
Author(s) -
Hashimoto Masanori,
Fujita Shinichi,
Endo Kazuhiko,
Ohno Hiroki
Publication year - 2009
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.2009.00664.x
Subject(s) - dentin , bottle , adhesive , degradation (telecommunications) , dentin bonding agents , dentistry , materials science , etching (microfabrication) , composite material , chemistry , polymer chemistry , bond strength , medicine , computer science , layer (electronics) , telecommunications
The purpose of this study was to evaluate the durability of one‐bottle self‐etching adhesive during long‐term water‐storage testing. Resin–dentin bonded specimens were prepared using four commercially available one‐bottle self‐etching adhesives. The specimens were sectioned perpendicular to the adhesive interface to produce beam‐shaped specimens that were stored in water for 24 h (control group) and 100, 200, and 300 d (experimental groups). After each storage period, the beams were subjected to a microtensile bond test. After the bond test, fractured surfaces were examined using a scanning electron microscope. In addition, interfacial observations of the silver tracer were performed using the secondary and back‐scatter modes of the scanning electron microscope. The bond strength of all tested adhesives decreased significantly after 100 or more days in water. The interfacial observations showed an oxygen‐inhibition zone as electron lucent in the adhesive–composite border in control specimens, displaying silver impregnation with breakage after aging. The deterioration of the oxygen‐inhibition zone in the adhesive–resin composite junction resulted in a decrease in bond strength after 100 d in water for one‐bottle self‐etching adhesives.