Abstract: In a method for the optical distinction of a dental material applied to a substrate from natural teeth, false teeth or parts thereof 0.00001 to 1% by wt. of a fluorescent substance having an absorption maximum in the wave length range of 360 to 480 nm and a fluorescence maximum in the wave length range of 480 to 600 nm is incorporated in the dental material, the dental material is applied to the substrate and irradiated with a light source emitting light of a wave length in the region of 360 to 480 nm and is then viewed through a light filter filtering out at least partially the light of a wave length in the region of 360 to 480 nm.

Abstract: Apart from polymerizable organic binders, a radiopaque dental material contains a fluoride of the rare earth metals or mixtures of such fluorides, as well as optionally further inorganic compounds as fillers. The dental material is suitable as a one or two-component filling material for dental cement, as a crown and bridge material, as well as for producing dentures, inlays and implants and is characterized by a high radiopacity and at the same time a good transparency.