1. Pre-sintered preform for teeth based glass ceramic the lithium metasilicate, wherein the preform has a relative density of 66 to 90%, in particular from 68 to 86% and preferably from 70 to 86%, relative to the true density steklokeramiki.2 . Workpiece according to Claim. 1, which essentially consists of a glass ceramic disilicate litiya.3. Preform according to one of claims. 1-2, which comprises a glass-ceramic the lithium metasilicate as the main crystalline phase, in particular more than 20 vol.%, Preferably more than 25 vol.% And particularly preferably more than 30 vol.% Litiya.4 disilicate crystals. Preform according to one of claims. 1-3, wherein the glass ceramic the lithium metasilicate contains at least one of the following components, wt.%: At etomMe (I) is selected from NaO O, KO, RbO, CSO, or mixtures thereof, Me (II) O is selected from CaO , BaO, MgO, SrO, ZnO and mixtures thereof, Me (III) Ovybirayut of AlO, LaO, BiO, YO, YbOi mixtures thereof, Me (IV) Ovybirayut of ZrO, TiO, SnO, GeOi mixtures thereof, Me (V) Ovybirayut from TaO, NbOi mixtures thereof, Me (VI) Ovybirayut of WO, MoOi mixtures thereof, selected from the seeded crystallization PO, metals and their smesey.5. Preform according to one of claims. 1-4, which has at least two regions, in particular the layer that are different coloring or svetopronitsaemostyu.6. Preform according to one of claims. 1-5, provided with a mount for processing ustroystva.7. Preform according to one of claims. 1-6, provided with a coupling device, in particular in the form of recesses for connection to the dental implantatom.8. Preform according to one of claims. 1-7, which can be prepared by the method of claim. 10 or 11.9. Preform according to one of claims. 1-8, which has a relative density which is obtained by (a) the appropriate starting glass powder with an average particle size of <50 microns, relative to the amount of particles at a pressure of 20 MPa to 200 MPa is preferred1. Предварительно спеченная заг
