Glass-ceramics, process of producing the glass-ceramics and dental crown using the glass-ceramics
First Claim
1. A glass ceramics produced by precipitating from glass a calcium-potassium mica crystal consisting of Ca--K--Mg--Al--Si--O--F and at least one crystal selected from the group consisting of an enstatite crystal, an akermanite crystal and a diopside crystal, said glass containing components being present within the ranges as follows:
-
space="preserve" listing-type="tabular">______________________________________ Percent of weight ______________________________________ CaO 2 to 17 K.sub.2 O 0.5 to 5 MgO 20 to 35 SiO.sub.2 30 to 50 Al.sub.2 O.sub.3 5 to 30 Fluorine (calculated as F) 1.5 to 14. ______________________________________
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is glass-ceramics produced by and a method of producing the glass-ceramics comprising the step of precipitating a calcium-potassium mica crystal consisting of Ca-K-Mg-Al-Si-O-F and at least one crystal selected from the group consisting of an enstatite crystal, an akermanite crystal and a diopside crystal, from glass containing components, in percent by weight, 2 to 17% of CaO, 0.5 to 5% of K2 O, 20 to 35% of MgO, 30 to 50% of SiO2, 5 to 30% of Al2 O3, and 1.5 to 14% of Fluorine (Calculated as F); or precipitating a calcium-potassium-sodium mica crystal consisting of Ca-K-Na-Mg-Al-Si-O-F and at least one crystal selected from the group consisting of an enstatite crystal, an akermanite crystal, a diopside crystal, an anorthite crystal and a richterite crystal, from glass containing components, in percent by weight, 2 to 17% of CaO, 0.5 to 5% of Kx O, 0.1 to 4% of Na2 O, 15 to 35% of MgO, 30 to 49% of SiO2, 5 to 30% of Al2 O3, and 1.5 to 14% of Fluorine (calculated as F). In the above method, the glass is heat treated successively at a temperature higher than its glass transition point by a range of from 10° to 100° C. and at a temperature higher than its glass transition point by a range of from 100° to 500° C. to thereby precipitate the above-mentioned matters.
Further disclosed is an artificial dental crown composed of the above-mentioned glass-ceramics.
-
Citations
9 Claims
-
1. A glass ceramics produced by precipitating from glass a calcium-potassium mica crystal consisting of Ca--K--Mg--Al--Si--O--F and at least one crystal selected from the group consisting of an enstatite crystal, an akermanite crystal and a diopside crystal, said glass containing components being present within the ranges as follows:
space="preserve" listing-type="tabular">______________________________________ Percent of weight ______________________________________ CaO 2 to 17 K.sub.2 O 0.5 to 5 MgO 20 to 35 SiO.sub.2 30 to 50 Al.sub.2 O.sub.3 5 to 30 Fluorine (calculated as F) 1.5 to 14. ______________________________________- View Dependent Claims (2, 5)
-
3. Glass-ceramics produced by precipitating from glass a calcium-potassium-sodium mica crystal consisting of Ca--K--Na--Mg--Al--Si--O--F and at least one crystal selected from the group consisting of an enstatite crystal, an akermanite crystal, a diopside crystal, an anorthite crystal and a richterite crystal, said glass containing components being present within the ranges as follows:
space="preserve" listing-type="tabular">______________________________________ Percent by weight ______________________________________ CaO 2 to 17 K.sub.2 O 0.5 to 5 Na.sub.2 O 0.1 to 4 MgO 15 to 35 SiO.sub.2 30 to 49 Al.sub.2 O.sub.3 5 to 30 Fluorine (calculated as F) 1.5 to 14. ______________________________________- View Dependent Claims (4)
-
6. An artificial dental crown comprising a glass-ceramics produced by the process of heating glass-containing components, present within the ranges as follows:
-
space="preserve" listing-type="tabular">______________________________________ Percent by weight ______________________________________ CaO 2 to 17 K.sub.2 O 0.5 to 5 MgO 20 to 35 SiO.sub.2 30 to 50 Al.sub.2 O.sub.3 5 to 30 Fluorine (calculated as F) 1.5 to 14 ______________________________________successively at a temperature higher than the glass transition point by a range of from 10°
to 100°
C. and at a temperature higher than its glass transition point by a range of from 100°
to 500°
C., to thereby precipitate from the glass a calcium-potassium mica crystal consisting of Ca--K--Mg--Al--Si--O--F and at least one crystal selected from the group consisting of an enstatite crystal, an akermanite crystal and a diopside crystal. - View Dependent Claims (7)
-
-
8. An artificial dental crown comprising a glass-ceramics produced by heating glass-containing components, present within the ranges:
-
space="preserve" listing-type="tabular">______________________________________ Percent by weight ______________________________________ CaO 2 to 17 K.sub.2 O 0.5 to 5 Na.sub.2 O 0.1 to 4 MgO 15 to 35 SiO.sub.2 30 to 49 Al.sub.2 O.sub.3 5 to 30 Fluorine (calculated as F) 1.5 to 14 ______________________________________successively at a temperature higher than its glass transition point by a range of from 10°
to 100°
C. and at a temperature higher than its glass transition point by a range of from 100°
to 500°
C., to thereby precipitate from the glass a calcium-potassium-sodium mica crystal consisting of Ca--K--Na--Mg--Al--Si--O--F and at least one crystal selected from the group consisting of an enstatite crystal, an akermanite crystal, a diopside crystal, an anorthite crystal and a richterite crystal. - View Dependent Claims (9)
-
Specification