Porcelain for dental prostheses; dental mastics; dental lacquer; dental cement; material for gluing ceramic parts, teeth or parts for teeth or dental prostheses; material for crowns and bridges for dental purposes, namely, dental adhesives; dental blanks, made of dental materials such as ceramics or metal alloys; dental blanks for manufacturing teeth or parts of teeth; glaze masses for teeth, also in liquid form, namely, dental lacquers