chemical preparations for use by dentists and dental laboratories; namely, adhesion promoters, [ teeth coating material such as protective lacquers of ceramic, metal or plastic, particularly photocuring plastics for dental and dental-laboratory purposes, and teeth masking materials such as protective lacquers of ceramic, metal or plastic, particularly photocuring plastics for dental and dental-laboratory purposes; teeth cleaning fluids especially oxidic solvents; adjuvants particularly diluen...