Gypsum-bonded Investment and Dental Precision Casting (III) Composition of Investment for the Quick Casting Technique
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概要
- 論文の詳細を見る
A simultaneous differential thermal analysis and thermogravimetry method previously established was used to estimate the composition of gypsum-bonded investment marketed for the quick casting technique. Three commercial investments of this type were heated to 700℃ at 10℃/min and the hemihydrate content was estimated by the mass decrease reached at 300℃ after subtracting the mass decrease at 100℃ as moisture content. The hemihydrate contents were between 25% and 30%, which appears to be the range also chosen for the conventional gypsum-bonded investment of cristobalite type over 70 years by the industry. However, the new type of investment contained both cristobalite and quartz. The small sample size is a disadvantage of the present method but this can be overcome by more frequent use of the method by investigators.
- 日本歯科理工学会の論文
著者
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Mori Toshiko
Department Of Dental Biomaterials College Of Dentistry Kyungpook National University
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Aghajani Farzaneh
Biomaterials Science Research Unit Faculty Of Dentistry The University Of Sydney:department Of Denta
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Aghajani Farzaneh
Biomaterials Science Unit Faculty Of Dentistry The University Of Sydney:department Of Dental Materia
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Mori Toshiko
Department Of Dental Biomaterials College Of Dentistry Kyungpook National University:biomaterials Sc
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