1. Li-silicate glass-ceramics comprising a trivalent metal oxide selected from YO, LaO, YbO, BiOi mixtures thereof, wherein the glass ceramic is substantially free from CO and NaO.2. Glass ceramic according to Claim. 1 except lithium silicate glass ceramic, which includes at least 6.1 wt.% ZrO.3. Glass ceramic according to Claim. 1 or 2, with the exception of lithium silicate glass ceramic, which includes at least 8.5 wt. % Transition metal oxide selected from the group consisting of yttrium oxides, oxides of transition metals having an atomic number of 41-79 and mixtures of these oksidov.4. Glass ceramic according to Claim. 1 or 2, which comprises less than 0.1 wt. % MgO and ZnO is substantially free of takovyh.5. Glass ceramic according to Claim. 1 or 2, which includes a trivalent metal oxide of YO, LaO, YbO, BiOi takovyh.6 mixtures. Glass ceramic according to Claim. 1 or n. 2, which includes a trivalent metal oxide or mixtures thereof in an amount of 0.1-15, in particular 2.0-10.0, preferably 2.0-8.0, and particularly preferably 2,4-6,0 wt. .7%. Glass ceramic according to Claim. 1 or 2, which contains lithium metasilicate as the main crystalline phase, and in particular, contains more than 5% by volume, preferably more than 10% by volume and particularly preferably more than 15% by volume litiya.8 metasilicate crystals. Glass ceramic according to Claim. 1 or 2, which contains lithium disilicate as main crystalline phase, and in particular contains more than 10 volume%, preferably greater than 20 volume% and particularly preferably more than 30% by volume litiya.9 disilicate crystals. Glass ceramic according to Claim. 1 or 2 which includes 55,0-85,0 particularly 60,0-80,0 and, pref1. Литиево-силикатная стеклокерамика, включающая в себя оксид трехвалентного металла, выбранный из Y2O3, La2O3, Yb2O3, Bi2O3 и смесей таковых, при этом стеклокерамика является, по существу, свободной от К2О и Na2O.2. Стеклокерамика по п. 1, за исключением литиево-силикатной стеклокерамик
