Low fusing dental porcelains containing fine-grained leucite

Details Low fusing dental porcelains containing fine-grained leucite Low fusing dental porcelains containing fine-grained leucite

1998-08-13

2000-09-19

Koslow, C. Melissa

Compositions: coating or plastic

Coating or plastic compositions

Dental

501 6, 501 32, 501 59, 501 66, 501 70, 501 67, 501 72, 4332021, 4332012, 264 16, A61C 13083, C03C 802, C03C 1400, C03C 1010

Patent

active

061205915

ABSTRACT:
A dental porcelain composition, comprising a glassy matrix and leucite crystallites embedded therein, and having maturing temperatures in the range from about 600.degree. C. to about 885.degree. C. and CTEs in the range from about 11 to about 19, more preferably in the range from about 11.5 to about 18, and most preferably in the range from about 12 to about 17.5.times.10.sup.-6 /.degree.C. (measured from 25.degree. C. to 500.degree. C.). The tetragonal leucite is preferably both fine-grained (i.e, having average diameters of less than about 7 microns) and uniformly-sized. Preferably, the average diameters are less than about 1 to about 3 microns.

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patent: 5698019 (1997-12-01), Frank et al.
patent: 5713994 (1998-02-01), Kramer et al.

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