Dental refractory model materials
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United States of America Patent
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Mar 29, 1994
Issued Date -
N/A
app pub date -
Jun 15, 1993
filing date -
Nov 18, 1987
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Expired
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Abstract
A dental refractory model material comprises as powdery components 5 to 20% by weight of a soluble phosphate, 5 to 20% by weight of magnesium oxide and 10 to 50% by weight of at least one selected from the group of alumina, zirconia, fused quartz, mullite, spinel and cordierite with the balance being crystalline quartz and crystobalite. The refractory model material also includes a liquid component such as a colloidal silica dispersion.
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