市販接着性レジンの接着強さと破壊靱性  [in Japanese] Adhesive Strength and Fracture Toughness of Five Commercially Available Adhesive Resins  [in Japanese]

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Author(s)

    • 永井 正洋 NAGAI Masahiro
    • 東京医科歯科大学生体材料工学研究所機械分野 Department of Biomechanical Engineering, Institute of Biomaterials and bioengineering, Tokyo Medical and Dental University
    • 杉田 拓也 SUGITA Takuya
    • 東京医科歯科大学生体材料工学研究所機械分野 Department of Biomechanical Engineering, Institute of Biomaterials and bioengineering, Tokyo Medical and Dental University
    • 宮入 裕夫 MIYAIRI Hiroo
    • 東京医科歯科大学生体材料工学研究所機械分野 Department of Biomechanical Engineering, Institute of Biomaterials and bioengineering, Tokyo Medical and Dental University

Abstract

本研究では, 市販の代表的な歯科用接着性レジン5種類 (SB, SBO, PV, BR, ID) を選択し, それらの接着強さおよび破壊靱性について, さらに耐久性の評価として, 4/60℃熱サイクル後のそれぞれの特性をも併せて比較検討した.得られた結果は, 次の通りである.SB, SBO, PV, BR, IDの接着強さには, 特に大きな差は認められないが, 破壊靱性 (<I>G<SUB>IC</SUB></I>) においては, フィラーを含有しないSBの破壊靱性値 (<I>G<SUB>IC</SUB></I>=592J/m<SUP>2</SUP>) は, フィラーを含有するPV, BR, IDの<I>G<SUB>IC</SUB></I>値に比べて9~14倍大きく示された. 熱サイクル後接着試験の結果, 接着強さは, 接着性レジンの種類に関係なく, 熱サイクルによる影響はわずかであり, 破壊様相も凝集破壊であった. 次に, 熱サイクル後破壊靱性は, PV, BR, IDのグループでは, <I>G<SUB>IC</SUB></I>値は, その並び順に4~31%の範囲で低下したのに比べ, SBでは, 86%と著しい低下率を示し, その破壊様相も界面はく離破壊に転じた.以上の結果から, 熱サイクル後の力学的試験において, 試験片の形状寸法が異なると, 耐久性に関する材料評価に大きく影響することが分かった.

We have chosen five commercially available adhesive resins, Super-Bond C&B (SB), SB for opaque resin (SBO), Panavia 21 (PV), Bistite II (BR) and Imperva Dual (ID), and investigated on their tensile adhesive strength (σ<SUB>t</SUB>) and fracture toughness (<I>G<SUB>IC</SUB></I>), and δ<SUB>t</SUB> and <I>G<SUB>IC</SUB></I> after 4/60°C themal-cycling for evaluating a durability, comparatively. The adherend used was a non-precious metal. The major findings were as follows. No great difference in σ<SUB>t</SUB> of SB, SBO, PV, BR and ID was recognized. But, in <I>G<SUB>IC</SUB></I>, the value (<I>G<SUB>IC</SUB></I>= 592J/m<SUP>2</SUP>) of SB without filler was 9 to 14 times as many as that of PV, BR and ID with filler. In all adhesive resins, by thermal-cycling test, their adhesive strengthes were not affected very much. And their fracture modes were observed as cohesive fracture. Next, in fracture toughness after thermal-cycling, the values of PV, BR and ID showed 4 to 31 percent decrease in order of the symbolized adhesives, and the value of SB notably lowered and showed 86 percent decrease. And the fracture mode of SB changed to interfacial fracture. These results revealed that a mechanical property after thermal-cycling was affected considerably by a size of test specimen, therefore, there is the possibility that we evaluate the durability of adhesive resin by mistake.

Journal

  • Adhesive Dentistry

    Adhesive Dentistry 17(3), 171-179, 1999-12-15

    Japan Society for Adhesive Dentistry

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