Dental porcelains
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United States of America Patent
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Jul 13, 2004
Grant Date -
Jul 3, 2003
app pub date -
Jun 12, 2002
filing date -
Jul 2, 1999
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Abstract
Opaque porcelains for use with metal cores in the manufacture of PFM restorations. The porcelains exhibit a coefficient of thermal expansion (CTE) substantially equal to or slightly above the CTE of the metal to which it is applied. The porcelains exhibit a CTE equal to or up to about 1.5.times.10.sup.-6 /.degree. C. higher than the dental alloys to which they are applied as the opaque. The porcelains are fabricated from a mixture of two frit compositions. A high expansion, leucite containing frit is combined with a low melting glass frit to provide a porcelain having an expansion in the range of 16.9 to about 18.5.times.10.sup.-6 /.degree. C. in the temperature range of 250.degree.-600.degree. C.
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