臼歯部用コンポジットレジンの表面硬さに及ぼす温度と有機酸の影響

概要

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Composite resin restorations have to tolerate the occlusal force and environmental changes during drinking and food-taking. In this study, the degradation of the composite resin was examined in terms of the changes in Knoop hardness when the specimen was stored in air or water at various temperatures (25-70℃). The effects of ethanol and three kinds of organic acids were also determined. It was found that the surface hardness of the specimen decreased with increase in temperature either in air or in water condition. The decrease was smaller in air than in water. The resins containing crystallized filler seemed to show larger reduction in hardness than those containing non-crystallized filler. The resins stored either in ethanol or in any of the organic acids appeared to have a marked decrease in hardness as compared to those stored in air. The decrease was the most prominent in ethanol or acetic acid, next in propionic acid and the least in lactic acid.
九州歯科学会の論文
1990-06-25