Dental investing material
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United States of America Patent
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Oct 13, 1998
Grant Date -
N/A
app pub date -
Jul 23, 1997
filing date -
Mar 31, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A dental investing material is disclosed which comprises a combination of: (a) quartz and/or cristobalite, (b) a phosphate binder, and (c) aluminous cement, wherein said dental investing material is further added with tridymite and magnesium silicate. The disclosed dental investing material shows minimized expansion during hardening, significant expansion during heating and develops no cracks when heated at a conventional heating rate.
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