Dental membranes for use in regenerating periodontal tissue, not including dental compounds for restorative procedures; substitutes for bones, cartilage, ligaments, and tendons; bone retractors; bone setting machines and instruments; bone forceps; osseous implants made of artificial materials; artificial bone parts to be implanted in natural bones; surgical implants comprised of artificial materials; bone substitutes for surgical use; artificial bones for implantation; endoprostheses