人工唾液汚染が歯科修復材料の接着に及ぼす影響

Effect of artificial saliva contamination on adhesion of dental restorative materials.

抄録

本研究の目的は，2種類のエッチング接着システムを用いた3種類の修復材料，すなわちグラスアイオノマーセメント（GIC），レジン添加GIC（RMGIC）およびコンポジットレジン（CR）に対する人工唾液汚染の影響を評価することである．人工唾液を用いて，牛歯にコントロール，軽度唾液汚染，重度唾液汚染の3種類の表面状態を作製した．CRの象牙質接着強さは，人工唾液汚染後に有意に低下した．しかし，GICおよびRMGICの象牙質接着強さおよびエナメル質接着強さに関しては，3つの表面条件間で有意差は認められなかった．さらに，CRは人工唾液汚染後に有意にマイクロリークが大きくなったが，GICおよびRMGICでは有意差は認められなかった．その結果，人工唾液の混入は，GICおよびRMGICのせん断接着強さやマイクロリークの程度に影響しないことが示された．

The purpose of this study was to evaluate the effects of artificial saliva contamination on three restorative materials, namely, a glass ionomer cement (GIC), a resin-modified GIC (RMGIC), and a composite resin (CR), for which two different etching adhesive systems were used. Thus, three surface conditions were created on bovine teeth using artificial saliva: control, mild saliva contamination, and severe saliva contamination. The dentin bond strength for CR was significantly lower after artificial saliva contamination. There were, however, no significant differences among the three surface conditions in terms of the dentin and enamel bond strengths of GIC and RMGIC. Moreover, CR exhibited significantly greater microleakage after artificial saliva contamination, whereas no significant differences were found in GIC and RMGIC. The results showed that artificial saliva contamination did not affect the shear bond strengths of GIC and RMGIC or their degrees of microleakage.