McAloon J, Mori T
Department of Prosthetic Dentistry, Faculty of Dentistry, University of Sydney.
Aust Dent J. 1993 Aug;38(4):306-8. doi: 10.1111/j.1834-7819.1993.tb05503.x.
The simultaneous differential thermal analysis--thermogravimetry (DTA-TG) method used in Part 1 of this two-part study was extended to analyse two gypsum-bonded dental casting investments, Kerr Cristobalite Inlay and GC Cristobalite Micro. Both investments had a similar cristobalite content of about 70 per cent. The remaining 30 per cent was dental stone in GCM, and a mixture of plaster and dental stone in KCl. Inclusion of plaster in KCl appeared responsible for the greater amount of water required for mixing this investment. The DTA-TG method used in the present study can be applied to identify the type and amount of hemihydrate, and the type of silica, in currently available gypsum-bonded investments.
在这个两部分研究的第一部分中所使用的同步差示热分析-热重分析法（DTA-TG）被扩展用于分析两种石膏粘结牙科铸造包埋材料，即 Kerr 方石英嵌体包埋材料和 GC 方石英微粉包埋材料。两种包埋材料都含有约 70%的类似方石英含量。其余 30%在 GC 微粉包埋材料中是牙科石膏，在 Kerr 嵌体包埋材料中是石膏和牙科石膏的混合物。Kerr 嵌体包埋材料中含有石膏似乎是导致混合这种包埋材料需要更多水的原因。本研究中使用的 DTA-TG 方法可用于识别市售石膏粘结包埋材料中的半水合物类型和含量以及二氧化硅类型。
