Machinable leucite-containing porcelain compositions and methods

Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics

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106 35, 501 32, 501 54, 501 66, 501 70, 501 72, 501 62, 4332011, 4332021, A61K 6027, C03B 2320, C03B 3202

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active

061331740

ABSTRACT:
A method for producing a machinable feldspathic porcelain comprising leucite is presented. Machinability is imparted to feldspathic porcelains by achieving homogeneous distribution of fine crystalline constituent comprised of at least one of the following leucite phases: potassium tetragonal leucite, rubidium leucite, cesium stabilized cubic leucite, rubidium stabilized cubic leucite, and pollucite. The porcelains produced in accordance with the present invention are readily machinable by using available diamond tooling techniques. Furthermore, the porcelains are especially useful for the fabrication of dental restorations using CAD/CAM technology.

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Denry IL, Holloway JA, Rosenstiel SF; Crystallization Kinetics of a Low-Expansion Feldspar Glass for Dental Applications: Journal of Biomedical Materials Research, (Sep. 5, 1998) 41 (3) 398-404.
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