Pressable lithium disilicate glass ceramics
DC CAFC
First Claim
Patent Images
1. A glass-ceramic composition consisting essentially of in weight percent:
- about 64 to about 70% SiO2;
about 1.5 to about 6 Al2O3;
about 10 to about 15% Li2O;
about 2.5 to about 5% K2O;
about 2 to about 7% P2O5 up to about 1.5% F;
up to about 7% BaO;
up to about 1% SrO;
up to about 5% Cs2O;
up to about 2.7% B2O3;
up to about 0.9% CaO;
up to about 3% Na2O;
up to about 2% TiO2;
up to about 3% ZrO2;
up to about 1% SnO2;
up to about 1% Sb2O3;
up to about 3% Y2O3;
up to about 1% CeO2;
up to about 1% Eu2O3;
up to about 1% Tb4O7;
up to about 2% Nb2O5; and
up to about 2% Ta2O5.
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Litigations
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Accused Products
Abstract
This invention is directed to lithium disilicate (Li2Si2O5) based glass-ceramics comprising silica, lithium oxide, alumina, potassium oxide and phosphorus pentoxide. The glass-ceramics are useful in the fabrication of single and multi-unit dental restorations (e.g. anterior bridges) made by heat pressing into refractory investment molds produced using lost wax techniques. The glass-ceramics have good pressability, i.e., the ability to be formed into dental articles by heat-pressing using commercially available equipment. In accordance with one embodiment directed to the process of making the glass-ceramics, the compositions herein are melted at about 1200° to about 1600° C., thereafter quenched (e.g., water quenched or roller quenched) or cast into steel molds, or alternately, cooled to the crystallization temperature. The resulting glass is heat-treated to form a glass-ceramic via a one or two step heat-treatment cycle preferably in the temperature range of about 400° to about 1100° C. The resulting glass ceramics are then pulverized into powder and used to form pressable pellets and/or blanks of desired shapes, sizes and structures which are later pressed into dental restorations.
253 Citations
66 Claims
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1. A glass-ceramic composition consisting essentially of in weight percent:
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about 64 to about 70% SiO2;
about 1.5 to about 6 Al2O3;
about 10 to about 15% Li2O;
about 2.5 to about 5% K2O;
about 2 to about 7% P2O5 up to about 1.5% F;
up to about 7% BaO;
up to about 1% SrO;
up to about 5% Cs2O;
up to about 2.7% B2O3;
up to about 0.9% CaO;
up to about 3% Na2O;
up to about 2% TiO2;
up to about 3% ZrO2;
up to about 1% SnO2;
up to about 1% Sb2O3;
up to about 3% Y2O3;
up to about 1% CeO2;
up to about 1% Eu2O3;
up to about 1% Tb4O7;
up to about 2% Nb2O5; and
up to about 2% Ta2O5. - View Dependent Claims (2, 60)
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3. A glass-ceramic composition consisting essentially of in weight percent:
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about 64 to about 70% SiO2;
about 5.2 to about 9 Al2O3;
about 10 to about 15% Li2O;
about 2 to about 7% P2O5;
up to about 1.5% F;
up to about 7% BaO;
up to about 1% SrO;
up to about 5% Cs2O;
up to about 5% K2O;
up to about 2.7% B2O3;
up to about 0.9% CaO;
up to about 3% Na2O;
up to about 2% TiO2;
up to about 3% ZrO2;
up to about 1% SnO2;
up to about 1% Sb2O3;
up to about 3% Y2O3;
up to about 1% CeO2;
up to about 1% Eu2O3;
up to about 1% Tb4O7;
up to about 2% Nb2O5; and
up to about 2% Ta2O5. - View Dependent Claims (4)
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5. A glass-ceramic composition comprising in weight percent:
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about 64 to about 70% SiO2;
about 1.5 to about 6 Al2O3;
about 10 to about 15% Li2O;
about 2 to about 7% P2O5;
about 2.2 to about 5% K2O;
about 0.5 to about 3% Na2O; and
about 0.5 to about 3% B2O3. - View Dependent Claims (6, 7, 62)
up to about 1.5% F;
up to about 7% BaO;
up to about 1% SrO;
up to about 5% Cs2O;
up to about 0.9% CaO;
up to about 2% TiO2;
up to about 3% ZrO2;
up to about 1% SnO2;
up to about 1% Sb2O3;
up to about 3% Y2O3;
up to about 1% CeO2;
up to about 1% Eu2O3;
up to about 1% Tb4O7;
up to about 2% Nb2O5; and
up to about 2% Ta2O5.
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62. A dental restoration comprising the glass-ceramic of claim 5.
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8. A glass-ceramic composition comprising in weight percent:
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about 62 to about 76% SiO2;
about 1.5 to about 10 Al2O3;
about 8 to about 19% Li2O;
about 0.3 to about 7% P2O5; and
about 0.5 to about 8% Ta2O5.
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9. A glass-ceramic composition comprising:
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about 62 to about 76% SiO2;
about 1.5 to about 10 Al2O3;
about 8 to about 19% Li2O;
about 0.3 to about 7% P2O5;
about 0.5 to about 8% Ta2O5; and
whereby the glass-ceramic is pressable.
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10. A glass-ceramic composition comprising in weight percent:
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about 62 to about 76% SiO2;
about 1.5 to about 10 Al2O3;
about 8 to about 19% Li2O;
about 0.3 to about 7% P2O5;
about 0.5 to about 8% Ta2O5;
up to about 5% B2O3;
up to about 5% Na2O;
up to about 7% K2O;
up to about 1.5% F;
up to about 5% ZnO;
up to about 2% MgO;
up to about 7% BaO;
up to about 1% SrO;
up to about 5% Cs2O;
up to about 7% CaO;
up to about 2% TiO2;
up to about 3% ZrO2;
up to about 1% SnO2;
up to about 1% Sb2O3;
up to about 3% Y2O3;
up to about 1% CeO2;
up to about 1% Eu2O3;
up to about 1% Tb4O7; and
up to about 2% Nb2O5.
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11. A glass-ceramic composition comprising in weight percent:
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about 68.8% SiO2;
about 1.3% B2O3;
about 4.8% Al2O3;
about 1.0% CaO;
about 2.8% BaO;
about 14.4% Li2O;
about 2.2% K2O;
about 1.5% Na2O; and
about 3.3% P2O5. - View Dependent Claims (12, 13, 65)
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14. A glass-ceramic composition comprising in weight percent:
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about 67.2% SiO2;
about 1.2% B2O3;
about 4.7% Al2O3;
about 1.0% CaO;
about 2.7% BaO;
about 14.1% Li2O;
about 2.2% K2O;
about 1.4% Na2O;
about 3.2% P2O5;
about 0.4% CeO2; and
about 2% Ta2O5. - View Dependent Claims (15, 16, 64)
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17. A method of making a lithium disilicate dental restoration comprising:
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melting a starting glass composition at temperatures within the range of about 1200 to about 1600°
C.;
quenching the glass melt;
subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400°
to about 1100°
C. to convert the glass into a glass-ceramic;
comminuting the glass ceramic to a powder;
compacting the powder to a starting blank;
sintering the blank; and
pressing the blank into the dental restoration.
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18. A method of making a lithium disilicate dental product comprising:
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melting a starting glass composition at temperatures within the range of about 1200 to about 1600°
C.;
quenching the glass melt;
subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400°
to about 1100°
C. to convert the glass into a glass-ceramic;
comminuting the glass ceramic to a powder;
compacting the powder to a starting blank; and
sintering the blank. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
about 62 to about 85% SiO2;
about 1.5 to about 10% Al2O3;
about 8 to about 19% Li2O;
about 2.5 to about 7% K2O; and
about 0.5 to about 12% P2O5.
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35. The method of claim 34 wherein the glass-ceramic further comprises in weight percent:
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up to about 4.9% B2O3;
up to about 1.5% F;
up to about 5% ZnO;
up to about 7% CaO;
up to about 2% MgO;
up to about 7% BaO;
up to about 1% SrO;
up to about 5% Cs2O;
up to about 5% Na2O;
up to about 2% TiO2;
up to about 3% ZrO2;
up to about 1% SnO2;
up to about 1% Sb2O3;
up to about 1% Sb2O3;
up to about 3% Y2O3;
up to about 1% CeO2;
up to about 1% Eu2O3;
up to about 1% Tb2O7;
up to about 2% Nb2O5; and
up to about 2% Ta2O5.
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36. A method of making a lithium disilicate dental product comprising:
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melting a starting glass at temperatures within the range of about 1200 to about 1600°
C.;
quenching the glass;
cooling the quenched glass to the crystallization temperature to form a glass-ceramic;
comminuting the glass ceramic to a powder;
compacting the powder to a starting blank; and
sintering the blank. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
about 62 to about 85% SiO2;
about 1.5 to about 10% Al2O3;
about 8 to about 19% Li2O;
about 2.5 to about 7% K2O; and
about 0.5 to about 12% P2O5.
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51. A method of making a lithium disilicate dental restoration comprising:
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melting a starting glass composition comprising in weight percent about 64 to about 70% SiO2;
about 1.5 to about 6 Al2O3;
about 10 to about 15% Li2O;
about 2.5 to about 5% K2O; and
about 2 to about 7% P2O5;
at temperatures within the range of about 1200°
to about 1600°
C.;
quenching the glass melt;
subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400°
to about 1100°
C. to convert the glass into a glass-ceramic;
comminuting the glass ceramic to a powder;
compacting the powder to a starting blank;
sintering the blank; and
pressing the blank into the dental restoration.
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52. A method of making a lithium disilicate dental restoration comprising:
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melting a starting glass composition comprising in weight percent about 62 to about 85% SiO2;
about 5.1 to about 10 Al2O3;
about 8 to about 19% Li2O; and
about 0.5 to about 12% P2O5;
at temperatures within the range of about 1200°
to about 1600°
C.;
quenching the glass melt;
subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400°
to about 1100°
C. to convert the glass into a glass-ceramic;
comminuting the glass ceramic to a powder;
compacting the powder to a starting blank;
sintering the blank; and
pressing the blank into the dental restoration.
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53. A method of making a lithium disilicate dental restoration comprising:
-
melting a starting glass composition comprising in weight percent about 64 to about 70% SiO2;
about 5.2 to about 9 Al2O3;
about 10 to about 15% Li2O; and
about 2 to about 7% P2O5;
at temperatures within the range of about 1200°
to about 1600°
C.;
quenching the glass melt;
subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400°
to about 1100°
C. to convert the glass into a glass-ceramic;
comminuting the glass ceramic to a powder;
compacting the powder to a starting blank;
sintering the blank; and
pressing the blank into the dental restoration.
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54. A method of making a lithium disilicate dental restoration comprising:
-
melting a starting glass composition comprising in weight percent about 64 to about 70% SiO2;
about 1.5 to about 6 Al2O3;
about 10 to about 15% Li2O;
about 2 to about 7% P2O5;
about 2.2 to about 5% K2O;
about 0.5 to about 3% Na2O; and
about 0.5 to about 3% B2O3;
at temperatures within the range of about 1200°
to about 1600°
C.;
quenching the glass melt;
subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400°
to about 1100°
C. to convert the glass into a glass-ceramic;
comminuting the glass ceramic to a powder;
compacting the powder to a starting blank;
sintering the blank; and
pressing the blank into the dental restoration.
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55. A method of making a dental restoration comprising:
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melting a starting glass composition comprising in weight percent about 68.8% SiO2;
about 1.3%B2O3;
about 4.8% Al2O3;
about 1.0% CaO;
about 2.8% BaO;
about 14.4% Li2O;
about 2.2% K2O;
about 1.5% Na2O; and
about 3.3% P2O5;
at temperatures within the range of about 1200°
to about 1600°
C.;
quenching the glass melt;
subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400°
to about 1100°
C. to convert the glass into a glass-ceramic;
comminuting the glass ceramic to a powder;
compacting the powder to a starting blank;
sintering the blank; and
pressing the blank into the dental restoration.
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56. A method of making a dental restoration comprising:
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melting a starting glass composition comprising in weight percent about 68.8% SiO2;
about 1.3% B2O3;
about 4.8% Al2O3;
about 1.0% CaO;
about 2.8% BaO;
about 14.4% Li2O;
about 2.2% K2O;
about 1.5% Na2O; and
about 3.3% P2O5;
at temperatures within the range of about 1200°
to about 1600°
C.;
quenching the glass melt;
subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400 to about 1100°
C. to convert the glass into a glass-ceramic;
comminuting the glass ceramic to a powder;
compacting the powder to a starting blank;
sintering the blank; and
pressing the blank into the dental restoration.
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57. A dental restoration comprising a glass-ceramic consisting essentially of:
-
about 62 to about 85% SiO2;
about 1.5 to about 10% Al2O3;
about 8 to about 19% Li2O;
about 2.5 to about 7% K2O;
about 0.5 to about 12% P2O5;
up to about 4.9% B2O3;
up to about 1.5% F;
up to about 7% CaO;
up to about 7% BaO;
up to about 1% SrO;
up to about 5% Cs2O;
up to about 5% Na2O;
up to about 2% TiO2;
up to about 3% ZrO2;
up to about 1% SnO2;
up to about 1% Sb2O3;
up to about 3% Y2O3;
up to about 1% CeO2;
up to about 1% Eu2O3;
up to about 1% Tb4O7;
up to about 2% Nb2O5; and
up to about 2% Ta2O5. - View Dependent Claims (58, 59)
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61. A dental restoration comprising the glass-ceramic composition comprising:
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about 64 to about 70% SiO2;
about 5.2 to about 9 Al2O3;
about 10 to about 15% Li2O; and
about 2 to about 7% P2O5.
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63. A dental restoration comprising the glass-ceramic comprising:
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about 62 to about 76% SiO2;
about 1.5 to about 10 Al2O3;
about 8 to about 19% Li2O;
about 0.3 to about 7% P2O5; and
about 0.5 to about 8% Ta2O5.
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66. A method of making a dental restoration comprising:
-
melting a starting glass composition comprising in weight percent about 62 to about 76% SiO2;
about 1.5 to about 10 Al2O3;
about 8 to about 19% Li2O;
about 0.3 to about 7% P2O5; and
about 0.5 to about 8% Ta2O5;
at temperatures within the range of about 1200°
to about 1600°
C.;
quenching the glass melt;
subjecting the quenched glass to one or more heat treatments in the temperature range of from about 400°
to about 1100°
C. to convert the glass into a glass-ceramic;
comminuting the glass ceramic to a powder;
compacting the powder to a starting blank;
sintering the blank; and
pressing the blank into the dental restoration.
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Specification
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Litigation Data
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Current AssigneeArdent, Inc. (Ivoclar Vivadent AG)
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Original AssigneeJeneric/Pentron Incorporated (Danaher Corporation)
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InventorsBrodkin, Dmitri, Panzera, Carlino, Panzera, Paul
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Primary Examiner(s)Koslow, C. Melissa
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Application NumberUS09/458,919Time in Patent Office1,019 DaysField of Search264/16, 264/19, 106/35, 501/5, 433/201.1, 433/202.1, 433/212.1US Class Current501/5CPC Class CodesA61K 6/17 Particle sizeA61K 6/78 PigmentsA61K 6/807 comprising magnesium oxideA61K 6/816 comprising titanium oxideA61K 6/818 comprising zirconium oxideA61K 6/822 comprising rare earth metal...A61K 6/824 comprising transition metal...A61K 6/833 Glass-ceramic compositesA61K 6/838 Phosphorus compounds, e.g. ...C03B 19/06 by sintering, e.g. by cold ...C03B 32/02 Thermal crystallisation, e....C03C 10/0027 containing SiO2, Al2O3, Li2...C03C 4/0021 for dental use
