Process for preparing glasses and glass-ceramics with SiO2 as the main crystalline phase

摘要

The present invention relates to a method of preparing a glass ceramic or glass that is particularly suitable for the preparation of dental restorations that contain cerium ions and whose fluorescence properties correspond approximately to those of natural teeth. The invention is suitable for use in glass ceramics and glasses obtainable using the method according to the invention, their use as dental materials, in particular for preparing dental restorations, and in the method according to the invention Also related to a glass-forming composition. According to a preferred embodiment, the starting glass melt is formed from a glass-forming composition comprising SiO2, Li2O, optionally a nucleating agent, a cerium compound, and at least one reducing agent.