Patent ID: 8162664

Claim:
Process for preparing a dental restoration, wherein a lithium silicate glass ceramic with lithium metasilicate as the main crystalline phase is used, which comprises the following components: Component wt. % SiO 2 64.0-75.0 Li 2 O 13.0-17.0 K 2 O 2.0-5.0 Al 2 O 3 0.5-5.0 Nucleating agent 2.0-5.0 Me(II)O 0-3.0 and which comprises less than 0.1 wt. % of ZnO, with Me(II)O being selected from at least one of CaO, BaO, MgO and SrO, wherein the lithium silicate glass ceramic with lithium metasilicate as the main crystalline phase is shaped to a desired geometry by machining or by hot pressing to form a shaped lithium silicate product.