長期浸漬試験において浸漬溶液のpHが接着耐久性に及ぼす影響  [in Japanese] Study on Endurance Property of Adhesion Systems Evaluated by Long-Term Immersion Test in Different pH Solutions  [in Japanese]

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Abstract

目的: 接着耐久性を<I>in vitro</I>で検討する長期浸漬試験は蒸留水中で行われてきた. しかし, 口腔内のpH値は, 2.3-8.0まで変化するとされている. そこで, 口腔内pHの上下限値と同じpHの溶液中で浸漬試験を実施して, 蒸留水浸漬の場合との接着耐久性の違いを検討した.<BR>方法: 3種類の歯科用合金および歯科用陶材を被着体として, 接着試験片を作製した. これらをpH2.3の乳酸水溶液, pH8.0の炭酸水素ナトリウム水溶液およびpH6.0の蒸留水の3種類の浸漬液に最長で36カ月まで浸漬した. 浸漬終了後, 剪断接着強さを測定した.<BR>結果: 金銀パラジウム合金およびCo-Cr合金をスーパーボンドC&Bで接着した場合には, 蒸留水 (pH6.0) 浸漬において接着強さの著しい低下を生じた. 金銀パラジウム合金およびNi-Cr合金をパナビア・フルオロセメントで接着した場合には, 乳酸水溶液 (pH2.3) 浸漬において接着強さが著明に低下した. また, 被着体が陶材の場合には, すべての接着強さ測定において陶材の凝集破壊が生じたため, 接着耐久性の検討は行えなかった.<BR>結論: 歯科用合金, 接着用表面処理が異なっても, 接着性レジンおよび浸漬液のpHが同じであれば, 接着耐久性には類似した傾向が認められた.

Purpose: An <I>in vitro</I> study on the durability of dental adhesion systems was conducted by the immersion test in distilled water. However, the pH of oral environment changes from 2.3 to 8.0. In this study, the immersion tests in solution of pH 2.3 and 8.0 were conducted and adhesive bond strengths were measured after immersion. The results were compared with those attained in distilled water.<BR>Methods: Three dental alloys and a porcelain were used as adherends for fabrication of adhesion specimens. These were immersed in two solutions, one was lactic acid solution maintained at pH 2.3 and the other was sodium hydrogencarbonate solution at pH 8.0. Distilled water at pH 6.0 was also used for comparison. After 36 months of the longest period, shear bond strengths were measured.<BR>Results: Au-Ag-Cu-Pd alloy and Co-Cr alloy specimens bonded with Super-Bond C & B showed abrupt decrease of bond strength in distilled water. Panavia Fluoro Cement specimens showed different characteristics and the bond strengths decreased in lactic acid solution. Porcelain specimen showed cohesive failure in porcelain adherent in every measurement, and adhesion durability could not be studied.<BR>Conclusions: Adhesion durability evaluated by long-term immersion test was affected by the kind of adhesive resin and pH value of immersion solution. However, the differences in dental alloys and their surface treatment did not affect the adhesion durability.

Journal

  • Nihon Hotetsu Shika Gakkai Zasshi

    Nihon Hotetsu Shika Gakkai Zasshi 46(2), 241-250, 2002-04-10

    Japan Prosthodontic Society

References:  26

Codes

  • NII Article ID (NAID)
    10008157046
  • NII NACSIS-CAT ID (NCID)
    AN00197911
  • Text Lang
    JPN
  • Article Type
    REV
  • ISSN
    03895386
  • Data Source
    CJP  J-STAGE 
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