Materials for use in dentistry, namely materials for the manufacture of dental impressions, artificial teeth and veneers, crowns and bridges, dental materials for the caries prophylaxis, namely varnish, solutions containing fluoride and antimicrobials, gels and fissure sealants; materials for the bleaching of teeth, namely dental gel and varnish; materials for the diagnosis of plaque and bacteria, namely invitro diagnostic preparations for dental purposes