42 Scientific and technological services, namely, research and design services in the field of dentistry; design and development of computer hardware and software for dental technology and dentistry; engineering services in the field of development and realization of products and applications for dentistry; design and development of dental prostheses, dental implants, dentures, bridges, crowns, caps, inlays, onlays, dental veneers; installation and maintenance of software in the dental field; support services for software for dental technology and dentistry, namely, troubleshooting of computer software problems