Method for preparing glass-ceramic
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United States of America Patent
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Sep 28, 2004
Grant Date -
Mar 27, 2003
app pub date -
Jul 3, 2002
filing date -
Jan 7, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a method for preparing a glass-ceramic containing leucite crystals, comprising the steps of: mixing (1) a glassy material comprising 53 to 65 wt. % of SiO.sub.2, 13 to 23 wt. % of Al.sub.2 O.sub.3, 9 to 20 wt. % of K.sub.2 O and 6 to 12 wt. % of Na.sub.2 O and (2) synthetic leucite seed crystals comprising 53 to 64 wt. % of SiO.sub.2, 19 to 27 wt. % of Al.sub.2 O.sub.3 and 17 to 25 wt. % of K.sub.2 O, and heat-treating the mixture at 750 to 950.degree. C. for 1 to 5 hours; and a dental porcelain powder and a metal-ceramic restoration both comprising a glass-ceramic prepared by the method. The porcelain comprising the glass-ceramic prepared by the method is substantially free of opacification and decrease in the coefficient of thermal expansion, during fusion-bonding to a metal frame.
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