Influence of oxygen inhibition on the surface free-energy and dentin bond strength of self-etch adhesives

Kensaku Koga, Akimasa Tsujimoto, Ryo Ishii, Masayoshi Iino, Mayumi Kotaku, Toshiki Takamizawa, Keishi Tsubota, Masashi Miyazaki

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15 Citations (Scopus)


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 35.5-39.8mJm -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 (13.2-13.6MPa) than in those with an oxygen-inhibited layer (17.5-18.4MPa). 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.

Original languageEnglish
Pages (from-to)395-400
Number of pages6
JournalEuropean Journal of Oral Sciences
Issue number5
Publication statusPublished - Oct 2011


  • Adhesive
  • Bond strength
  • Functional monomer
  • Oxygen-inhibited layer
  • Surface free-energy


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