Method of producing a dental product
First Claim
Patent Images
1. A method of producing a dental product, the method comprising the steps of:
- providing a blank made from a green body of ceramic material,re-sintering at a temperature at a beginning of a neck area of a density versus temperature curve, wherein the neck area is where a relatively flat part of the curve is followed by a relatively sharply rising part of the curve,performing a machining operation on the blank, andsubsequently sintering the blank to its final density in a sintering operation performed at a heating rate in the range of 0.1-1°
C./minute and held at a temperature in the range of 1300°
C. to 1650°
C.
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Abstract
Methods of producing a dental product are disclosed. Certain methods include the steps of providing a pre-sintered blank made from a green body of ceramic material, performing a machining operation on the blank, and subsequently sintering the blank to its final density in a sintering operation performed at a temperature in the range of 1300° C. to 1650° C. The pre-sintered blank that is provided may have a strength in the range of 53-107 MPa.
50 Citations
19 Claims
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1. A method of producing a dental product, the method comprising the steps of:
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providing a blank made from a green body of ceramic material, re-sintering at a temperature at a beginning of a neck area of a density versus temperature curve, wherein the neck area is where a relatively flat part of the curve is followed by a relatively sharply rising part of the curve, performing a machining operation on the blank, and subsequently sintering the blank to its final density in a sintering operation performed at a heating rate in the range of 0.1-1°
C./minute and held at a temperature in the range of 1300°
C. to 1650°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15)
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12. A method of producing a dental product, the method comprising the steps of:
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providing a blank made from a green body of ceramic material, pre-sintering at a temperature at a beginning of a neck area of a density versus temperature curve, wherein the neck area is where a relatively flat part of the curve is followed by a relatively sharply rising part of the curve, performing a machining operation on the blank, and subsequently sintering the blank to its final density in a sintering operation, the blank being held at a temperature in the range of 1300°
C. to 1650°
C., wherein prior to pre-sintering, the green body blank has been isostatically pressed at a pressure of 200 MPa-300 MPa. - View Dependent Claims (16, 17)
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13. A method of producing a dental product, the method comprising the steps of:
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providing a blank made from a green body of ceramic material, pre-sintering at a temperature at a beginning of a neck area of a density versus temperature curve, wherein the neck area is where a relatively flat part of the curve is followed by a relatively sharply rising part of the curve, performing a machining operation on the blank, and subsequently sintering the blank to its final density in a sintering operation, the blank being held at a temperature in the range of 1300°
C. to 1650°
C. and sintered to a final density of 6.00 g/cm3- 6.09 g/cm3. - View Dependent Claims (18, 19)
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Specification
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Current AssigneeNobel Biocare Services AG (Envista Holdings Corporation)
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Original AssigneeNobel Biocare Services AG (Envista Holdings Corporation)
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InventorsEriksson, Cecilia, Brnnvall, Petrus, Jrneus, Lars, Berggren, Carina
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Primary Examiner(s)Yi, Stella
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Application NumberUS13/533,824Publication NumberTime in Patent Office1,687 DaysField of Search264 16- 20, 264/677, 264/678, 264/497, 264/605, 264/652, 433/167, 433/168.1, 433/171, 433/199.1, 433/201.1, 433/6, 433/153, 433154-157US Class Current1/1CPC Class CodesA61C 13/0022 Blanks or green, unfinished...A61C 13/083 Porcelain or ceramic teeth ...A61C 5/77 Methods or devices for maki...
