Patent ID: 8546280

Claim:
Process for preparing a dental restoration comprising: providing a lithium silicate glass, which comprises nuclei suitable for the preparation of lithium metasilicate and which is essentially free of lithium silicate crystals and 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, shaping the glass which comprises nuclei suitable for the preparation of lithium metasilicate and which is essentially free of lithium silicate crystals to a desired geometry by machining or by hot pressing to form a shaped lithium silicate product.