The invention relates to lithium silicate glass ceramics and lithium silicate glasses which have a content in special oxides of monovalent elements, which crystallize at low temperatures and which are particularly suitable as dental materials.Se describen cerámicos de vidrio de silicato de litio y vidrios que comprenden óxidos específicos de elementos monovalentes que cristalizan a bajas temperaturas y son apropiados en particular como materiales dentales.