Plastics in the form of paste or powder and material mainly consisting of plastics in the form of paste or powder for the manufacture of tooth crowns, tooth bridges, artificial teeth and plastic prostheses; plastics as modelling material for dental uses, impression material for dental uses, material for tooth fillings, dental lacquers, insulating agents for dental uses, namely such for gypsum models for use in the manufacture of plastic prostheses; special surface coating sandblasting agent, chemical resin-to-metal bond, all being for dental purposes