Effect of warm air-drying on dentin bond strength of single-step self-etch adhesives

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  • OGURA Yukari
    Department of Operative Dentistry, Nihon University School of Dentistry
  • SHIMIZU Yusuke
    Department of Operative Dentistry, Nihon University School of Dentistry
  • SHIRATSUCHI Koji
    Department of Operative Dentistry, Nihon University School of Dentistry
  • TSUJIMOTO Akimasa
    Department of Operative Dentistry, Nihon University School of Dentistry
  • TAKAMIZAWA Toshiki
    Department of Operative Dentistry, Nihon University School of Dentistry
  • ANDO Susumu
    Department of Operative Dentistry, Nihon University School of Dentistry
  • MIYAZAKI Masashi
    Department of Operative Dentistry, Nihon University School of Dentistry

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The effect of warm air-drying on the dentin bond strengths of the single-step self-etch adhesives was determined. The adhesives were applied to bovine dentin followed by drying in a stream of warm air for 5, 10, and 15 s at 37°C. Resin composites were condensed into a mold and polymerized. Specimens were stored in distilled water at 37°C for 24 h, then shear tested. The surface free-energies were determined by measuring the contact angles of three test liquids placed on the cured adhesives. The dentin bond strengths varied according to the air-drying time. The value of the acid component increased slightly when drying was performed with a stream of warm air, whereas that of the base component decreased signifi cantly. These data suggested that warm air-drying was essential to obtain adequate bond strengths, although increasing the drying time did not significantly influence the bond strength.

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