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Study of gypsum‐bonded casting investments. Part 2
Author(s) -
McAloon Janis,
Mori Toshiko
Publication year - 1993
Publication title -
australian dental journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.701
H-Index - 71
eISSN - 1834-7819
pISSN - 0045-0421
DOI - 10.1111/j.1834-7819.1993.tb05503.x
Subject(s) - cristobalite , gypsum , differential thermal analysis , thermogravimetry , leucite , materials science , casting , calcination , metallurgy , mineralogy , mixing (physics) , chemistry , ceramic , inorganic chemistry , biochemistry , quartz , physics , quantum mechanics , diffraction , optics , catalysis
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 KCI. Inclusion of plaster in KCI 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 hemi‐hydrate, and the type of silica, in currently available gypsum‐bonded investments.