title: Prevalence of malocclusion and index of orthodontic treatment need in children in Tehran.
abstract: OBJECTIVE
  The aim of the present study was to determine the prevalence of malocclusion among schoolgirls and to assess malocclusion using the Index of Orthodontic Treatment Need (IOTN).
  
  
  METHODS
  A total of 350 subjects were selected by a multistage randomised cluster sampling method. All of the selected subjects were schoolgirls aged 14 to 17 years. Malocclusion was determined using the IOTN. A chi-square test was performed to evaluate the data obtained.
  
  
  RESULTS
  The present study reported that 16.3% of subjects had no treatment need, 35.7% had a mild treatment need, 35.4% had a moderate treatment need and a further 5.2% to 7.4% had a severe to extreme treatment need, respectively. Therefore, the prevalence of malocclusion was found to be 83.7% among Tehranian schoolgirls of age 14 to 17 years.
  
  
  CONCLUSIONS
  The prevalence of malocclusion is very high among Tehranian schoolgirls; therefore, greater care is required to reduce this prevalence.
authors.affiliation: Orthodontic Department, Islamic Azad University, Tehran, Iran. info@jamilian.net
authors.forename: Abdolreza
authors.initials: A
authors.lastname: Jamilian
authors.forename: Mitra
authors.initials: M
authors.lastname: Toliat
authors.forename: Sarah
authors.initials: S
authors.lastname: Etezad
mesh_terms: D000293:Adolescent; D005260:Female; D006301:Health Services Needs and Demand / Q000706:statistics & numerical data*; D006801:Humans; D007492:Iran / Q000453:epidemiology; D008310:Malocclusion / Q000145:classification / Q000453:epidemiology*; D024343:Open Bite / Q000453:epidemiology; D009971:Orthodontics, Corrective / Q000706:statistics & numerical data*; D015995:Prevalence