合着用セメントの計量誤差とその影響 : 第 1 報採取方法による粉液比の変動

概要

論文の詳細を見る
The characteristics of the luting cement are affected by the powder/liquid ratio for mixing. Although the ratio may be intentionally altered in order to modify some particular property, unexpected errors in proportioning of the powder and liquid can be caused by wrong dispensing method. In this report, therefore, the changes in powder/liquid ratio due to dispensational errors were examined for commercially available luting cements. The weight of one accessory spoon of powder was significantly changed by the dispensing condition of the powder. As compared with the standard dispensation after the powder was mildly stirred in the bottle, 10 to 50% increased powder was dispensed from the stilly placed bottle while 10 to 40% decreased powder from the rolled bottle. For the liquid, the successive dispensation of a given number of droplets showed 10 to 20% larger weight than the separate dropping. When the dispenser was tilted, the weight of the droplets decreased 5 to 40%. From the combinations of such dispensational errors of the powder and liquid, it was found that the potential changes in powder/liquid ratio might be as much as ±20 to 30%.
九州歯科学会の論文
1993-04-25