title: [Cases analysis and clinical classification of oligodontia].
abstract: OBJECTIVE
  To classify the clinical symptoms of oligodontia and summarize the characteristics of the diseases.
  
  
  METHODS
  33 patients with congenitally permanent teeth missing (6 or more than 6) were taken clinical examination, diagnosis, prosthetic treatment and made records of the status of tooth agenesis, systemic symptoms, and family history.
  
  
  RESULTS
  The symptoms of oligodontia were clinically classified into two groups: oligodontia with or without systemic syndromes. And the former has two typical kinds of diseases: anhidrotic/hypohidrotic ectodermal dysplasia (EDA) and Rieger syndrome.
  
  
  CONCLUSIONS
  Correct diagnosis and early treatment for these patients are of very importance.
authors.affiliation: Department of Prosthodontics, Peking University School of Stomatology, Beijing 100081, China.
authors.forename: Xiao-xia
authors.initials: XX
authors.lastname: Zhang
authors.forename: Hai-lan
authors.initials: HL
authors.lastname: Feng
mesh_terms: D000293:Adolescent; D000328:Adult; D000848:Anodontia / Q000175:diagnosis* / Q000628:therapy; D002648:Child; D002675:Child, Preschool; D004476:Ectodermal Dysplasia / Q000175:diagnosis; D005124:Eye Abnormalities / Q000175:diagnosis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013577:Syndrome