[The observation of older teeth viewed from periodontics (author's transl)].
D000367:Age Factors; D000368:Aged; D005882:Gingival Diseases / Q000150:complications*; D006801:Humans; D008875:Middle Aged; D010514:Periodontal Pocket / Q000209:etiology*; D010518:Periodontitis / Q000209:etiology*; D014072:Tooth Abrasion / Q000150:complications*