5 CHEMICAL PREPARATIONS-NAMELY, PLASTICS IN THE FORM OF PASTE OR POWDER FOR THE MANUFACTURE OF TOOTH CROWNS, TOOTH BRIDGES, ARTIFICAL TEETH AND PLASTIC PROSTHESES; PLASTICS AS MODELLING MATERIAL FOR DENTAL USES, IMPRESSION MATERIAL FOR DENTAL USES, TOOTH FILLERS, TOOTH LACQUERS, INSULATING AGENTS FOR DENTAL PURPOSES-NAMELY, SUCH FOR GYPSUM MODELS FOR USE IN MANUFACTURE OF PLASTIC PROSTHESES AND INJECTIONS FOR DENTAL USES