title: AAP centennial commentary: theme 3: Evolution and application of classification systems for periodontal diseases--a retrospective commentary*.
authors.affiliation: Theme 3, as identified in J Periodontol 2014;85:3-9, is Periodontal Diseases Encompass Multiple Conditions of the Teeth-Supporting Tissues, Including Periodontitis Which Involves Multiple Entities With Different Etiologies, Different Clinical and Biological Characteristics, and Different Treatment Needs.
authors.forename: Gary C
authors.initials: GC
authors.lastname: Armitage
mesh_terms: D003774:Dental Plaque Index; D005891:Gingivitis / Q000145:classification; D006801:Humans; D017622:Periodontal Attachment Loss / Q000145:classification; D010510:Periodontal Diseases / Q000145:classification*; D010512:Periodontal Index; D010514:Periodontal Pocket / Q000145:classification; D018570:Risk Assessment