Lithium silicate glasses or glass-ceramics, process for their preparation and their use

摘要

The invention relates to glass ceramics based on the lithium metasilicate system (Li.sub.2O.SiO.sub.2 (Li.sub.2SiO.sub.3)), which are readily machinable in an intermediate stage of crystallization and, after complete crystallization, constitute a high-strength, highly translucent and chemically stable glass ceramic.