合着用セメントの計量誤差とその影響 : 第 2 報硬化特性と圧縮強さ

概要

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The previous report showed the changes in powder/liquid ratio due to dispensational errors for luting cements. Within the range of such errors, the effects of the changes in powder/liquid ratio on setting time, film thickness and compressive strength were examined in this report. When the powder/liquid ratio became smaller than the standard recommended by the manufacturer, the setting time was prolonged by 1 to 5 min and some cements required more than 10 min for setting. Although it was shortened by 1 to 3.5 min with increase in powder/liquid ratio, the time was distributed from 4 to 8 min acceptable for practical use in all the cements used. As the powder/liquid ratio varied, the film thickness changed almost linearly with a few exceptions in polycarboxylate and glass ionomer cements which showed little changes even the ratio increased as much as 30%. The compressive strength conformed to the specification at any powder/liquid ratios within the dispensational errors although it almost linearly changed from -30 to +40%. The polycarboxylate cements showed the least changes in the compressive strength. It should be noted from the foregoing results that the dispensational errors in proportioning of powder and liquid might cause significant changes in the characteristics.
九州歯科学会の論文
1993-04-25