A lithium silicate glass ceramic, a lithium silicate glass withnuclei for forming lithium metasilicate and/or lithiumdisilicate, and processes for the preparation thereof areprovided. The above-mentioned materials include hexavalentmetal oxides. Uses of the above-mentioned materials as dentalmaterials are further provided. In the dental materials field,there is a need for lithium silicate glasses and ceramics whichcan be crystalized at lower temperatures.
