Method for the production of a blank, blank and a dental restoration
AssigneeDENTSPLY SIRONA Inc.
InventorsMarkus Vollmann, Lothar Volkl, Stefan Fecher, Carsten Wiesner
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Abstract
The invention relates to a method for the production of a blank of a ceramic material, wherein a first ceramic material and then a second ceramic material of different compositions are filled into a mold and wherein the materials are pressed and after pressing are sintered. Thereby, a layer of the first ceramic material is filled into the mold, a first open cavity is formed in the layer, the second ceramic material is filled into the first open cavity and the materials are pressed together and are then heat-treated. Both the first ceramic material and the second ceramic material contain, or consists of, lithium silicate glass ceramic.
Claims14
A pre-sintered or fully sintered blank for use in producing a dental restoration, the presintered or fully sintered blank is formed from a ceramic material comprising regions of different compositions, wherein a first region is of a first ceramic material and at least one second region is of a second ceramic material, wherein the first and second regions are adjacent to each other, wherein the first or the second ceramic material or the first and the second ceramic materials include lithium silicate glass ceramic, wherein the at least one second region extends within the first region and has an outer geometry that tapers from a basal region or base surface;
- wherein the at least one second region commencing from the basal region or base surface has a cone shaped cavity dimensioned to accept a grinding tool.
A pre-sintered blank for use in producing a dental restoration, wherein the pre-sintered blank is formed from a ceramic material comprising regions of different compositions, wherein a first region is of a first ceramic material and at least one second region is of a second ceramic material, wherein the first and second regions are adjacent to each other, wherein the first or the second ceramic material or the first and the second ceramic materials include lithium silicate glass ceramic, wherein the at least one second region extends within the first region and has an outer geometry that tapers from a basal region or base surface;
- wherein the at least one second region commencing from the basal region or base surface has a cavity;
- and
- wherein the cavity includes a cone shaped cavity dimensioned to accept a grinding tool.
Dependencies are inferred from the claim text.