Compositions: coating or plastic – Coating or plastic compositions – Dental
Patent
1998-10-08
2000-07-11
Koslow, C. Melissa
Compositions: coating or plastic
Coating or plastic compositions
Dental
4332021, 4332011, 501 6, 501 32, 501 59, 501 66, 501 70, 501 72, 501 74, 264 16, C03C 1010, A61C 13083, A61C 1300
Patent
active
060866624
ABSTRACT:
A dental porcelain composition, comprising a glassy matrix and rubidium leucite crystallites embedded therein, and having maturing temperatures in the range from about 650.degree. C. to about 800.degree. C. and CTEs in the range from about 13 to about 17, more preferably in the range from about 13.5 to about 16, and most preferably in the range from about 14 to about 16.times.10.sup.-6 /.degree. C. (measured from 25.degree. C. to 400.degree. C.). The tetragonal rubidium leucite is preferably both fine-grained (i.e., having average diameters of less than about 5 microns) and uniformly sized. Preferably, the average diameters are less than about 1 to about 2 microns.
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Martin RF, Lagache M; Cell Edges and Infrared Spectra of Synthetic Leucites and Pollucites in the System KalSi.sub.2 O.sub.6 --RbAlSi.sub.2 O.sub.6 --CsAlSi.sub.2 O.sub.6 ; Canadian Mineralogist vol. 13, pp. 275-281 (1975). No month.
Taylor D; Thermal Expansion Data XV, Complex Oxides with the Leucite Structure and Frameworks Based on Six-Membered Rings of Tetrahedra; Journal, vol. 90, No. 6, 197-204, 1991. No month.
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Brodkin Dmitri
Panzera Carlino
Jeneric Pentron Incorporated
Knab Ann M.
Koslow C. Melissa
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