title: [Pathogenic bacteria in periodontal diseases].
mesh_terms: D000190:Actinomyces / Q000472:pathogenicity; D005891:Gingivitis / Q000209:etiology / Q000382:microbiology*; D006801:Humans; D010518:Periodontitis / Q000209:etiology / Q000382:microbiology*; D001443:Prevotella melaninogenica / Q000472:pathogenicity