title: Research in periodontal therapy.
mesh_terms: D016025:Bone Transplantation; D005890:Gingivectomy; D006801:Humans; D007742:Labial Frenum / Q000601:surgery; D010510:Periodontal Diseases / Q000601:surgery*; D012106:Research; D013357:Subgingival Curettage; D014182:Transplantation, Autologous; D014184:Transplantation, Homologous