Influence of Surface Treatment of Glass-ionomer Cements on Bond Strength with Resin Composite

DOI
  • Eiichiro OTSUKA
    Department of Operative Dentistry, Nihon University School of Dentistry
  • Akimasa TSUJIMOTO
    Department of Operative Dentistry, Nihon University School of Dentistry Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry
  • Kenji TSUCHIYA
    Department of Operative Dentistry, Nihon University School of Dentistry
  • Hirofumi UEDA
    Department of Operative Dentistry, Nihon University School of Dentistry
  • Tomoe KANAZAWA
    Department of Operative Dentistry, Nihon University School of Dentistry
  • Kazutaka HIRAI
    Department of Operative Dentistry, Nihon University School of Dentistry
  • Masayuki TAKIMOTO
    Department of Operative Dentistry, Nihon University School of Dentistry
  • Ryo KAWAMOTO
    Department of Operative Dentistry, Nihon University School of Dentistry Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry
  • Toshiki TAKAMIZAWA
    Department of Operative Dentistry, Nihon University School of Dentistry Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry
  • Masashi MIYAZAKI
    Department of Operative Dentistry, Nihon University School of Dentistry Division of Biomaterials Science, Dental Research Center, Nihon University School of Dentistry

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Other Title
  • グラスアイオノマーセメントの表面処理条件がコンポジットレジンとの接着性に及ぼす影響
  • —A Surface-free Energy Perspective—
  • —表面自由エネルギーからの検討—

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Abstract

 Purpose: This study evaluated the influence of the surface treatment of glass-ionomer cement (GIC) on the bond strength of resin composite and surface-free energies.<br> Methods: One conventional GIC (Fuji IX GP) and two resin modified (RM) GICs (Fuji II LC EM, Fuji Fill LC Flow) were used. The GICs were hand-mixed according to the manufacturers’ instructions, inserted into the mold and a transparent matrix was added to give a smooth surface. For RMGICs, specimens were light-irradiated for 20 s. Specimens were prepared and divided into three groups as follows: without pretreatment (control), 35% phosphoric acid etching for 10 s, and air-abrasion for 10 s. The adhesive was applied and resin composite was bonded according to the manufacturers’ instructions. The bonded specimens were stored for 24 hours in distilled water at 37℃. Ten specimens per group were tested in shear mode at a cross-head speed of 1.0 mm/min. The surface-free energies of five specimens per group were determined by measuring contact angles. Data for each adhesive system were analyzed using Tukey’s HSD test.<br> Results: For conventional GIC, acid etching or air-abrasion increased the bond strength (8.7-9.2 MPa) when compared with the control (5.7 MPa); however, RMGIC resulted in significantly lower bond strengths (11.1-14.4 MPa) than in the control (16.4-21.2 MPa). The value of the γs－component increased when conventional GIC was treated with phosphoric acid or air-abrasion (54.1-62.1 mN・m－1) when compared with the control (53.2 mN・m－1). For RMGICs, lower values of the γs－component were detected for the control group (20.0-24.1 mN・m－1), indicating the presence of a resin-rich layer on the surface.<br> Conclusion: The results of this study showed that surface treatment of the conventional GIC promoted higher bond strength to resin composite, but decreased bond strengths for RMGICs. RMGIC surfaces should be left untreated to obtain optimal bonding to resin composite, due to similar chemistry between RMGIC and the resin composite which allows strong chemical bonding of RMGIC to the resin composite.

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