Lithium Silicate Glass Ceramic for Fabrication of Dental Appliances
AssigneeJames R. Glidewell Dental Ceramics, Inc.
InventorRodolfo Castillo
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Abstract
The present invention relates to a method of fabricating an improved lithium silicate glass ceramic and to that material for the manufacture of blocks for dental appliances using a CAD/CAM process and hot pressing system. The lithium silicate material has a chemical composition that is different from those reported in the prior art with 1 to 10% of germanium dioxide in final composition. The softening points are close to the crystallization final temperature of 800° C. indicating that the samples will support the temperature process without shape deformation.
Claims14
A method of making a dental restoration comprising:
- obtaining a lithium silicate glass ceramic blank comprising silicon dioxide (SiO2), lithium oxide (Li2O), and germanium oxide (GeO2), wherein a molar ratio of SiO2/Li2O is between 1.8 and 1.9;
- and
- milling the lithium silicate glass ceramic blank into the shape of a dental restoration to obtain a pre-crystallized lithium silicate glass ceramic dental restoration;
- and
- heating the pre-crystallized lithium silicate glass ceramic dental restoration at a temperature sufficient to cause crystallization of the lithium silicate glass ceramic and to thereby obtain a crystallized lithium silicate glass ceramic dental restoration.
A method of making a dental restoration comprising:
- obtaining a lithium silicate glass ceramic blank comprising silicon dioxide (SiO2), lithium oxide (Li2O), and germanium oxide (GeO2), wherein a molar ratio of SiO2/Li2O is between 1.8 and 1.9;
- and
- heating the lithium silicate glass ceramic blank at a temperature sufficient to cause crystallization of the lithium silicate glass ceramic;
- and
- pressing the heated lithium silicate glass ceramic blank into the shape of a dental restoration to obtain a crystallized lithium silicate glass ceramic dental restoration.
A method of making a dental restoration comprising:
- obtaining a lithium silicate glass ceramic blank comprising silicon dioxide (SiO2), lithium oxide (Li2O), and germanium oxide (GeO2), wherein a molar ratio of SiO2/Li2O is between 1.8 and 1.9;
- and
- milling the lithium silicate glass ceramic blank into the shape of a dental restoration.
Dependencies are inferred from the claim text.