石こう模型の寸法安定性 : 第1報各種模型用石こうの凝結膨張について

概要

論文の詳細を見る
The objective of this study was to clarify the dimensional stability of stone cast after setting. The setting expansion of gypsum products was measured by using the JIS measurement system, until the setting expansion was finished. The results were as follows : 1. After a 2-hour period, the setting expansion for high-strength dental stones was 0.06〜0.12%, that for dental stones was 0.19〜0.34%, and that for dental plaster was 0.15%. 2. High-strength dental stones continued to expand for 4〜7 days, dental stones continued to expand for 2〜3 days, and dental plaster continued to expand for 3 days. 3. From the 2-hour period until the expansion was finished, high-strength dental stones expanded 0.01〜0.08%, dental stones expanded 0.03〜0.07%, and dental plaster expanded 0.05%.
福岡歯科大学学会の論文
1991-10-30