PROBLEM TO BE SOLVED: To provide a process for preparing dental restorations wherein glass ceramics and/or glass can be used and can be advantageously processed to the desired restorations.SOLUTION: In the process for preparing dental restorations, lithium silicate glass ceramic or lithium silicate glass which contains at least 8.5 wt.% transition metal oxide is used. The transition metal oxide is selected from a group consisting of oxides of yttrium, oxides of transition metals with an atomic number of 41-79 and mixtures of these oxides.