Porous silicate ceramic body, dental restorations and method for the production thereof
First Claim
1. A dental restoration obtained by a process comprising the steps ofmolding together a first component and a second component to form a molded silicate-ceramic green body, wherein the second component has a different color than the first component, wherein the second component is arranged within the first component to form an interface in such a way that the interface represents a surface curved in space, and wherein the first and second components contain a feldspar ceramic material comprising feldspar and a metal oxide selected from the group consisting of SiO2, Al2O3, Na2O, and K2O or an oxide ceramic material comprising a metal oxide selected from the group consisting of SiO2, Al2O3, and stabilized ZrO2,partially sintering the molded silicate-ceramic green body to obtain a porous silicate-ceramic body having a first density and an ISO 6872 three-point bending strength of 25-180 MPa,milling the porous silicate-ceramic body to a silicate-ceramic precursor having the dental restoration shape,positioning the silicate-ceramic precursor directly on a ceramic scaffold or optionally opaquer-coated metal scaffold, anddense-sintering the silicate-ceramic precursor directly on, and fusing the precursor directly with, the ceramic scaffold or optionally opaquer-coated metal scaffold to obtain a silicate ceramic-fused final dental restoration having a second density such that the first-density/second-density ratio is 2/5-98/100.
1 Assignment
0 Petitions
Accused Products
Abstract
A porous, silicate, ceramic body, optionally with different colors, with a first density, 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, is 25 to 180 MPa.
-
Citations
7 Claims
-
1. A dental restoration obtained by a process comprising the steps of
molding together a first component and a second component to form a molded silicate-ceramic green body, wherein the second component has a different color than the first component, wherein the second component is arranged within the first component to form an interface in such a way that the interface represents a surface curved in space, and wherein the first and second components contain a feldspar ceramic material comprising feldspar and a metal oxide selected from the group consisting of SiO2, Al2O3, Na2O, and K2O or an oxide ceramic material comprising a metal oxide selected from the group consisting of SiO2, Al2O3, and stabilized ZrO2, partially sintering the molded silicate-ceramic green body to obtain a porous silicate-ceramic body having a first density and an ISO 6872 three-point bending strength of 25-180 MPa, milling the porous silicate-ceramic body to a silicate-ceramic precursor having the dental restoration shape, positioning the silicate-ceramic precursor directly on a ceramic scaffold or optionally opaquer-coated metal scaffold, and dense-sintering the silicate-ceramic precursor directly on, and fusing the precursor directly with, the ceramic scaffold or optionally opaquer-coated metal scaffold to obtain a silicate ceramic-fused final dental restoration having a second density such that the first-density/second-density ratio is 2/5-98/100.
Specification