title: Periodontitis in children, adolescents and young adults. The changing concepts: 1. Nomenclature and clinical features.
mesh_terms: D000293:Adolescent; D000328:Adult; D010520:Aggressive Periodontitis / Q000473:pathology*; D002648:Child; D006801:Humans; D010510:Periodontal Diseases / Q000473:pathology*; D010518:Periodontitis / Q000473:pathology*; D009626:Terminology as Topic