US5066619A
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US
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Glass-ceramics, process of producing the glass-ceramics and dental crown using the glass-ceramics
Assignee: Hoya Corp
•
Filing: 1990-08-23
•
Granted: 1991-11-19
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Expires: 2010-08-23
Abstract
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 K 2 O, 20 to 35% of MgO, 30 to 50% of SiO 2 , 5 to 30% of Al 2 O 3 , 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 K x O, 0.1 to 4% of Na 2 O, 15 to 35% of MgO, 30 to 49% of SiO 2 , 5 to 30% of Al 2 O 3 , 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.
Inventors
- 👤 Tomoko Kasuga
- 👤 Toshihiro Kasuga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:24
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/16; A; A61; A61K; A61K6/00; A61K6/80; A61K6/802; A61K6/807; A61K6/816; A61K6/818; A61K6/822; A61K6/824; A61K6/831; A61K6/833
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
82 words
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: ______________________________________
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.
______________________________________
Claim 2
Dependent Claim
82 words
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: ______________________________________
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.
______________________________________
Claim 3
Dependent Claim
48 words
A glass-ceramics according to claim 1, wherein said glass contains at least one component selected from the group consisting of SrO, TiO 2 , Nb 2 O 5 , Ta 2 O 5 , Y 2 O 3 and ZrO 2 in an amount of 5% or less.
Claim 4
Dependent Claim
91 words
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: ______________________________________
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.
______________________________________
Claim 5
Dependent Claim
91 words
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: ______________________________________
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.
______________________________________
Claim 6
Dependent Claim
48 words
The glass-ceramics according to claim 3, wherein said glass contains at least one component selected from the group consisting of SrO, TiO 2 , Nb 2 O 5 , Ta 2 O 5 , Y 2 O 3 and ZrO 2 in an amount of 5% of less.
Claim 7
Dependent Claim
17 words
An artificial dental crown comprising the glass-ceramics of any one of claims 1, 2, 3 or 4.
Claim 8
Dependent Claim
128 words
An artificial dental crown comprising a glass-ceramics produced by the process of heating glass-containing components, present within the ranges as follows: ______________________________________
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.
Claim 9
Dependent Claim
128 words
An artificial dental crown comprising a glass-ceramics produced by the process of heating glass-containing components, present within the ranges as follows: ______________________________________
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.
Claim 10
Dependent Claim
49 words
The artificial dental crown of claim 6, wherein said glass contains at least one component selected from the group consisting of SrO, TiO 2 , Nb 2 O 5 , Ta 2 O 5 , Y 2 O 3 and ZrO 2 in an amount of 5% or less.
Claim 11
Dependent Claim
134 words
An artificial dental crown comprising a glass-ceramics produced by heating glass-containing components, present within the ranges: ______________________________________
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.
Claim 12
Dependent Claim
134 words
An artificial dental crown comprising a glass-ceramics produced by heating glass-containing components, present within the ranges: ______________________________________
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.
Claim 13
Dependent Claim
49 words
The artificial dental crown of claim 8, wherein said glass contains at least one component selected from the group consisting of SrO, TiO 2 , Nb 2 O 5 , Ta 2 O 5 , Y 2 O 3 and ZrO 2 in an amount of 5% or less.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-11-18 | 1995-05-20 | 1995-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-18 | 1999-05-20 | 1999-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-18 | 2003-05-20 | 2003-11-19 | $7700.00 | Window Closed / Lapsed |