埋没材のレオロジー的性質に関する研究 : (第 1 報)泥漿の流動特性について

概要

論文の詳細を見る
Investment used in the casting practice in dentistry consists of a refractory, a binder and other chemicals. The refractory material is usually quartz or cristobalite. The binder material in the investment is some kind of calcium sulfate hemihydrate. Although varions types of physical test would be necessary to define a satisfactory investment, consistency of the slurry, which is directly related to the water-powder ratio used, is thought to be one of the most important properties that should be selected carefully. The proper water-powder ratio is generally determined by slump test. It is a simple practical test and it is not so closely related to fluidity of the investment slurry. The purpose of the present study is to find out a rheological parameter for fluidity of the imvestment slurry. First, the apparent vitcosity of investment has been measured by B-type viscometer, and then the reciprocal of the former (the apparent coefficient of fluidity) has been calculated. The coefficient has been used by the author as a parameter for fluidity. The present results show that the coefficient is a reasonable parameter for the investment slurry and that it is very useful for the clinical evaluation.
九州歯科学会の論文
1965-08-31