Porous, silicate, ceramic body, dental restoration and method for the production thereof
First Claim
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1. A process for preparing a dental restoration comprising the steps ofpartially sintering a metal-oxide containing feldspar green body to obtain a metal-oxide containing porous feldspar silicate-ceramic body having a first density, an ISO 6872 coefficient of thermal expansion (GTE) of at least 7×
- 10−
6 K−
1, and an ISO 6872 three-point bending strength of 25-180 MPa,milling the porous feldspar silicate-ceramic body to a precursor having the dental restoration shape,positioning the precursor directly on a ceramic scaffold or metal scaffold, wherein the precursor is optionally coated with an opaquer before positioning on the metal scaffold, anddense-sintering the precursor directly on, and fusing the precursor directly with, the ceramic scaffold or metal scaffold to obtain a ceramic-fused final dental restoration having a second density such that the first-density/second density ratio is 2/5-98/100.
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Abstract
The present invention relates to a porous, silicate, ceramic body, possibly with different colors, with a first density, which can be sintered into a silicate, ceramic body with a second density, wherein the ratio of the first density to the second density is 2/5 to 98/100, and the three-point bending strength of the porous, silicate ceramic body with a first density, measured according to ISO 6872, amounts to 25 to 180 MPa.
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Citations
7 Claims
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1. A process for preparing a dental restoration comprising the steps of
partially sintering a metal-oxide containing feldspar green body to obtain a metal-oxide containing porous feldspar silicate-ceramic body having a first density, an ISO 6872 coefficient of thermal expansion (GTE) of at least 7× - 10−
6 K−
1, and an ISO 6872 three-point bending strength of 25-180 MPa,milling the porous feldspar silicate-ceramic body to a precursor having the dental restoration shape, positioning the precursor directly on a ceramic scaffold or metal scaffold, wherein the precursor is optionally coated with an opaquer before positioning on the metal scaffold, and dense-sintering the precursor directly on, and fusing the precursor directly with, the ceramic scaffold or metal scaffold to obtain a ceramic-fused final dental restoration having a second density such that the first-density/second density ratio is 2/5-98/100. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification