石こう模型の寸法安定性第2報石こう模型の経日的寸法変化について

概要

論文の詳細を見る
The objective of this study was to clarify the dimensional stability of stone casts after setting. Stone casts were made from three kinds of gypsum products (DENSITE, FUJIROCK, NEW-HYDROGIPS). The gradual dimensional changes of two of the stone casts with different shapes were measured after setting for 7 days. The simple-shaped stone casts showed no additional changes for 24 hours, but then they began to contract. Contraction continued until the end of the testing period. The maxillary stone casts showed no additional changes for 6 hours, but then they began to contract. Contraction continued until the end of the testing period. Each stone cast made from three kinds of gypsum products showed the dimensional change curve characteristic of gypsum products without a stone cast shape. DENSITE and NEW-HYDROGIPS showed expansion for 12 hours. However, they began to contract from the 12th hour until the end of the testing period. FUJIROCK continued to contract for 7 days without expansion.
福岡歯科大学学会の論文
1992-01-31