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US 6,660,073 B1Granted
Method of manufacture of dental porcelain having small leucite crystallites
AssigneeJeneric/Pentron Incorporated
InventorsCarlino Panzera, Lisa M. Kaiser
Life of this patent
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Abstract
A porcelain composition for dental restorations comprising a leucite crystallite phase and a glass matrix phase, wherein the leucite crystallites possess diameters not exceeding about 10 micron. Preferably, the porcelain composition has a maturing temperature from about 750° to about 1050° C. and a coefficient of thermal expansion from about 12×10−6/° C. to about 17.5×10−6/° C., and comprises: Component Amount (wt. %) SiO2 57-66 Al2O3 7-15 K2O 7-15 Na2O 7-12 Li2O 0.5-3.
Claims15
A method of manufacturing a dental porcelain composition having a leucite crystallite phase and a glass matrix phase comprising:
- providing a first porcelain powder component;
- allowing a first mixture comprising water and a second porcelain powder component comprising leucite to stand until a first solid and a first supernatant liquid separates;
- decanting the first supernatant liquid;
- mixing the first supernatant liquid with water to form a second mixture;
- allowing the second mixture to stand until a second solid and a second supernatant liquid separates;
- decanting the second solid from the second supernatant liquid;
- drying the second supernatant to provide a dried porcelain powder comprising leucite;
- screening the dried powder through a mesh screen of at least about 325 mesh;
- blending the resulting powder with the first porcelain powder component to form a blend;
- and
- firing the blend to produce the dental porcelain composition wherein the leucite crystallites possess diameters that do not exceed about 10 microns and represent from about 5 to about 65 weight percent of the dental porcelain composition.
8 more elements
Dependencies are inferred from the claim text.