A lithium silicate glass ceramic, a lithium silicateglass with nuclei for forming lithium metasilicate and/orlithium disilicate crystals, and processes for the preparationthereof are provided. The above-mentioned materials featuredivalent metal oxides and may crystalize at lower temperatures.Uses of the above-mentioned materials as dental materials areprovided. In the dental materials field, there is a need forlithium silicate glasses and ceramics which can be crystalizedat lower temperatures.