title: [Management of periodontal diseases. 1. Etiology of periodontal diseases and the immunological mechanism].
mesh_terms: D000818:Animals; D003773:Dental Plaque / Q000276:immunology; D004285:Dogs; D006801:Humans; D008214:Lymphocytes / Q000276:immunology; D010510:Periodontal Diseases / Q000209:etiology* / Q000276:immunology