[ IMPRESSION MATERIAL FOR DENTAL USES AND TOOTH CEMENT-NAMELY, MATERIALS PRIMARILY CONSISTING OF PLASTICS IN PASTE OR POWDER FORM FOR TOOTH CROWNS, TOOTH BRIDGES, ARTIFICIAL TEETH AND PLASTIC PROSTHESES; PLASTICS AS MODELLING MATERIAL FOR DENTAL USES, IMPRESSION MATERIAL FOR DENTAL USES, TOOTH STOPPERS, TOOTH LACQUERS, ] TOOTH CEMENT [ , INSULATING MATERIALS FOR DENTAL USES-NAMELY, FOR GYPSUM MODELS FOR USE IN THE MANUFACTURE OF DENTAL PROSTHESES MADE OF PLASTICS ]