title: American Academy of Periodontology Task Force Report on the Update to the 1999 Classification of Periodontal Diseases and Conditions.
mesh_terms: D000047:Academies and Institutes; D026683:Advisory Committees; D010520:Aggressive Periodontitis / Q000145:classification; D055113:Chronic Periodontitis / Q000145:classification; D006801:Humans; D017622:Periodontal Attachment Loss / Q000145:classification; D010510:Periodontal Diseases / Q000145:classification*; D010517:Periodontics; D010518:Periodontitis / Q000145:classification; D014481:United States