Abstract: The invention relates to a process for the preparation of a dental restoration, in which an oxide ceramic material is (a) subjected to at least one heat treatment, and (b) cooled, wherein the cooling comprises (b1) a first cooling step with the cooling rate T1 and (b2) a second cooling step with the cooling rate T2 and wherein the absolute value of the cooling rate T2 is less than the absolute value of the cooling rate T1.

Abstract: The invention relates to a dental opaquer composition which can be used to increase the opacity of zirconium oxide ceramics. In addition, the invention relates to a process for producing a dental restoration, in which the opacity of the zirconium oxide ceramic is increased by using the opaquer composition.

Abstract: The present invention relates to a transparent glass body that comprises at least one antireflective glass surface (2) constructed on at least one surface of the transparent glass body and at least one glasslike protective coating (3) applied to the antireflective glass surface (2). The portion of reflected radiation ER is minimized and the transmitted radiation ET is increased accordingly. The contamination amount K can penetrate the antireflective surface only to a very reduced extent. Degradation caused by weathering is minimized. The present invention further relates to a method for the production as well as to uses of a transparent glass body.