Pre-sintered blank for dental purposes
AssigneeIvoclar Vivadent AG
InventorsHarald Bürke, Christian Ritzberger, Marcel Schweiger, Volker Rheinberger, Diana Tauch
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Abstract
Pre-sintered blanks based on lithium metasilicate glass ceramic are described which are suitable in particular for the preparation of dental restorations.
Claims25
Pre-sintered blank for dental purposes based on lithium metasilicate glass ceramic, wherein the blank has a relative density of from 66 to 90% relative to a blank of same composition that has been fully sintered to a lithium disilicate glass ceramic and wherein the pre-sintered blank has layers which differ in color or translucence.
Process for the preparation of the blank according to 18, wherein the temperature of the heat treatment is at least 540° C., and lies in a range which extends over at least 50K and in which the relative density varies by less than 2.0%.
Process for the preparation of the blank according to 18, wherein the temperature of the heat treatment is at least 580° C., and lies in a range which extends over at least 70K, and in which the relative density varies by less than 1.5%.
Dependencies are inferred from the claim text.