- 著者
-
森口 愛
小正 裕
柿本 和俊
権田 悦通
- 出版者
- Japan Prosthodontic Society
- 雑誌
- 日本補綴歯科學會雜誌 = The journal of the Japan Prosthodontic Society (ISSN:03895386)
- 巻号頁・発行日
- vol.43, no.5, pp.857-866, 1999-10-10
- 被引用文献数
-
11
It was attempted to coat the refractory models by zirconia to improve a reactive layer of the pure titanium denture base cast using phosphate-bonded investment and to compare with a usual investing method.<BR>When the coating refractory models were used, the small residual investment on the casting plate removing from the mold was observed.<BR>The surface hardness of the castings prepared with TAIVEST was hardly different between the two samples. However, the surface hardness of the castings prepared with T-INVEST C & B was slightly greater control samples on the casting surface to a depth of about 30μm, but there was little difference between the samples for the depth.<BR>In the coating samples, the microstructure of the surface of the castings showed almost no evident chill layer. The control samples had a chill layer and a columnar crystal layer extending from the surface toward the interior.<BR>Use of the electron probe microanalyzer (EPMA) to determine distribution of various elements in the superficial layer of casting plates showed the reactive layer contained Si and P in control samples. In coating samples, it showed a small reactive layer contained impure elements though there was a high density of Zr of the surface layer of the castings.<BR>The results are suggested that it is possible to improve a reactive layer of the surface of pure titanium denture base cast using phosphate-bonded investment by coating of the surface of the refractory models.