Effect of HEMA on Bonding to Dentin Pretreated with Phosphoric Acid

DOI 5 Citations
  • WATANABE Isao
    Division of Organic Materials, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University
  • HIRANUMA Katsumi
    Division of Organic Materials, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University
  • NAKABAYASHI Nobuo
    Division of Organic Materials, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University

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  • 光重合型ボンディング剤のリン酸処理象牙質への接着 : HEMAの効果

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Abstract

The present study investigated the effect of treating dentin with 2-hydroxyethyl methacrylate(HEMA)prior to application of a photocure bonding agent.The photocure bonding agent was composed of 0.5% camphorquinone(CQ)as a photosensitizer, 0.5% N-phenyl-glycine(NPG)as a reducing agent, 5.0% 2-methacryroyloxyethyl phenyl hydrogen phosphate(Phenyl-P)as an adhesion promoting monomer and 94.0% triethyleneglycol dimethacrylate(TEGDMA)as a base monomer.Bovine dentin samples were ground with 600-grid Carbimet paper discs(Buehler, USA), and demineralized with either aqueous solutions of 1, 5, 10, 20, 40 or 65% phosphoric acid.Improvement of bond strength depended on whether dentin treated with HEMA was rinsed.Without rinsing, improvement of bond strength was achieved even during contact of collagen with HEMA for 1min only.The effect of the 1min-HEMA treatment disappeared with rinsing on the tensile bond test.But even when rinsed, with HEMA treatment for 60min, improved bond strengths were achieved.When HEMA application followed phosphoric acid etching, a hybrid layer was demonstrated on SEM, and the bond strength increased to 6-7MPa.

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