Chemical products for dental uses, namely plastics in paste or powder form and material, mainly consisting of plastics in paste or powder form for tooth crowns, tooth bridges, artificial teeth, plastic prostheses; modelling material for dental uses; embedding materials for dental uses, impression material for dental uses, tooth filling agents, tooth lacquers, insulating agents for dental uses, namely such for gypsum models in the manufacture of plastic tooth prostheses, being goods included in cl. 5