Apparatus for fabricating dental prostheses (specifically adapted for dental use); Apparatus for use in the fitting of dental prostheses; Dental prostheses; Apparatus for dental purposes; Apparatus for dental use; Apparatus for use in dental laboratories; Dental crowns; High frequency cutting apparatus for dental purposes; High frequency cutting instruments for dental purposes; Inspection glasses for medical or dental use; Inspection instruments for medical or dental use; Lasers for dental purposes; Protective mouth masks for dental use; Protective visors for dental use