title: Supernumerary teeth amongst Iranian orthodontic patients. A retrospective radiographic and clinical survey.
abstract: OBJECTIVE
  To investigate the prevalence, characteristics (malocclusion, location, type) and gender distribution of supernumerary teeth (ST) in an Iranian orthodontic population.
  
  
  METHODS
  A retrospective study was carried out using radiographs (periapicals, panoramic) and study models of 1751 subjects (870 girls, 881 boys; age range 9-27 years). The Pearson chi-square test was used to determine differences in the distribution of ST when stratified by gender and malocclusion type.
  
  
  RESULTS
  Fourteen ST were found in 13 patients (six males, seven females), giving a prevalence rate of 0.74%. The prevalence rate of ST was higher in Class III malocclusions (5.2%) and was a rare finding among Class II malocclusions (0.1%). The occurrence rate of ST was higher in maxilla (78.5%) than in mandible (21.5%). The most common type of ST was the conical form (43%). We did not observe any late-developing paramolar or distomolar ST.
  
  
  CONCLUSIONS
  The prevalence rate of ST in our study was 0.74% and ST were more common among Class III malocclusions.
authors.affiliation: Department of Orthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Elaheh
authors.initials: E
authors.lastname: Vahid-Dastjerdi
authors.forename: Ali
authors.initials: A
authors.lastname: Borzabadi-Farahani
authors.forename: Mina
authors.initials: M
authors.lastname: Mahdian
authors.forename: Nazila
authors.initials: N
authors.lastname: Amini
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D005260:Female; D006801:Humans; D007492:Iran / Q000453:epidemiology; D008297:Male; D008310:Malocclusion / Q000453:epidemiology; D008311:Malocclusion, Angle Class I / Q000453:epidemiology; D008312:Malocclusion, Angle Class II / Q000453:epidemiology; D008313:Malocclusion, Angle Class III / Q000453:epidemiology; D008334:Mandible / Q000473:pathology; D008437:Maxilla / Q000473:pathology; D009971:Orthodontics, Corrective / Q000706:statistics & numerical data*; D015995:Prevalence; D016300:Radiography, Bitewing / Q000706:statistics & numerical data; D011862:Radiography, Panoramic / Q000706:statistics & numerical data; D012189:Retrospective Studies; D012737:Sex Factors; D014096:Tooth, Supernumerary / Q000453:epidemiology*; D055815:Young Adult