Castable glass-ceramic composition useful as dental restorative
First Claim
1. A glass-ceramic having high strength and a high softening temperature, consisting essentially of the following constituents, on a mole percent basis:
-
space="preserve" listing-type="tabular">______________________________________ Li.sub.2 O 28.5-30.5 SiO.sub.2 57-62 Al.sub.2 O.sub.3 1-2 CaO 5-7 P.sub.2 O.sub.5 1-2.5 TiO.sub.2 0.5-1.5 ZrO.sub.2 0.5-1.5 ______________________________________ wherein the crystalline phase is lithium disilicate, said glass ceramic having a flexural strength of from about 40,000 psi to about 52,000 psi, and a softening temperature of from about 750°
C. to about 825°
C.
4 Assignments
0 Petitions
Accused Products
Abstract
A glass ceramic, useful in making dental crowns and bridges, consisting essentially of:
______________________________________
Broad Range, Preferred Component Mole Percent Mole % ______________________________________ Li2 O 24-33 29.5 ± 1 SiO2 37-74.3 59.0 ± 3,-2 Al2 O3 0.5-4 1.5 ± 0.5 CaO 1-10 6.0 ± 1 P2 O5 0.2-4 2.0 + 0.5,-1 TiO 0-4 1.0 ± 0.5 ZrO2 0-4 1.0 ± 0.5 MgO 0-2 -- K2 O 0-2 -- ______________________________________
-
Citations
4 Claims
-
1. A glass-ceramic having high strength and a high softening temperature, consisting essentially of the following constituents, on a mole percent basis:
-
space="preserve" listing-type="tabular">______________________________________ Li.sub.2 O 28.5-30.5 SiO.sub.2 57-62 Al.sub.2 O.sub.3 1-2 CaO 5-7 P.sub.2 O.sub.5 1-2.5 TiO.sub.2 0.5-1.5 ZrO.sub.2 0.5-1.5 ______________________________________wherein the crystalline phase is lithium disilicate, said glass ceramic having a flexural strength of from about 40,000 psi to about 52,000 psi, and a softening temperature of from about 750°
C. to about 825°
C. - View Dependent Claims (2, 3, 4)
-
Specification