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Influence of oxygen inhibition on the surface free‐energy and dentin bond strength of self‐etch adhesives
Author(s) -
Koga Kensaku,
Tsujimoto Akimasa,
Ishii Ryo,
Iino Masayoshi,
Kotaku Mayumi,
Takamizawa Toshiki,
Tsubota Keishi,
Miyazaki Masashi
Publication year - 2011
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.1600-0722.2011.00849.x
Subject(s) - dentin , adhesive , bond strength , oxygen , composite material , materials science , layer (electronics) , surface energy , contact angle , dental bonding , chemistry , organic chemistry
Koga K, Tsujimoto A, Ishii R, Iino M, Kotaku M, Takamizawa T, Tsubota K, Miyazaki M. Influence of oxygen inhibition on the surface free‐energy and dentin bond strength of self‐etch adhesives.
Eur J Oral Sci 2011; 119: 395–400. © 2011 Eur J Oral Sci We compared the surface free‐energies and dentin bond strengths of single‐step self‐etch adhesives with and without an oxygen‐inhibited layer. The labial dentin surfaces of bovine mandibular incisors were wet ground with #600‐grit silicon carbide paper. The adhesives were applied to the ground dentin, light‐irradiated, and the oxygen‐inhibited layer was either retained or removed with ethanol. The surface free‐energies were determined by measuring the contact angles of three test liquids placed on the cured adhesives. The dentin bond strengths of specimens with and without the oxygen‐inhibited layer were measured. For all surfaces, the value of the estimated surface tension component was relatively constant at 35.5–39.8 mJ m −2 . The value of the , Lewis acid component increased slightly when the oxygen‐inhibited layer was removed, whereas that of the , Lewis base component decreased significantly. The bond strengths of the self‐etch adhesives were significantly lower in specimens without an oxygen‐inhibited layer (13.2–13.6 MPa) than in those with an oxygen‐inhibited layer (17.5–18.4 MPa). These results indicate that the presence of an oxygen‐inhibited layer in single‐step self‐etch adhesives with advanced photoinitiators promotes higher dentin bond strength.