Materials for dental purposes, especially impression, modelling and embedding compounds, tooth filling materials; adhesives for dentures; ceramic compounds, plastics and alloys for dental purposes, especially as filling materials for the surface treatment of teeth; caustics, sealants and adhesives for dental purposes; dental lacquer, dental mastics, dental cements and dental amalgams in paste, gel and liquid form, especially for use in crowns, bridges, dentures and palatal plates; disinfectants for dental purposes; dam materials for dental purposes, especially rubber dam, particularly in paste form