Abstracts of the General Sessions of the Japanese Society for Dental Materials and Devices
46th General Session of the Japanese Society for Dental Materials and Devices
Session ID : P-55
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Host: The Japanese Society for Dental Materials and Devices

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Development of casting investment preventing blackening of noble metal alloy-effect of Mg(OH)2 or Ca(OH)2 added-
*Akira Nakai, Shin-ichi Goto, Hideo Ogura
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Abstract
Four pure metal powder was individually added a casting investment to decrease the oxigen content in the mold and to prevent blackening of as-cast surface of noble metal alloys. These were reported that blackening of as-cast surface of noble metal alloys using boron or aluminum powder added investment. In this study, Mg(OH)SUB2SUB or Ca(OH)SUB2SUB was individually added to a casting investment to have a basic property at casting temperature. It was found that blackening of as-cast surface of a Ag-Pd-Cu-Au alloy was prevented. And there was not between the Mg(OH)SUB2SUB and Ca(OH)SUB2SUB addition.
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© 2005 by The Japanese Society for Dental Materials and Devices
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