Patent ID: 6660073
Filing Date: 2003-12-09
Classification: A61K,C03C

Abstract:
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.