title: Prevalence of dental developmental anomalies: a radiographic study.
abstract: OBJECTIVE
  To determine the prevalence of developmental dental anomalies in patients attending the Dental Faculty of Medical University of Yazd, Iran and the gender differences of these anomalies.
  
  
  METHODS
  A retrospective study based on the panoramic radiographs of 480 patients. Patients referred for panoramic radiographs were clinically examined, a detailed family history of any dental anomalies in their first and second degree relatives was obtained and finally their radiographs were studied in detail for the presence of dental anomalies.
  
  
  RESULTS
  40.8% of the patients had dental anomalies. The more common anomalies were dilaceration (15%), impacted teeth (8.3%) and taurodontism (7.5%) and supernumerary teeth (3.5%). Macrodontia and fusion were detected in a few radiographs (0.2%). 49.1% of male patients had dental anomalies compared to 33.8% of females. Dilaceration, taurodontism and supernumerary teeth were found to be more prevalent in men than women, whereas impacted teeth, microdontia and gemination were more frequent in women. Family history of dental anomalies was positive in 34% of the cases.. Taurodontism, gemination, dens in dente and talon cusp were specifically limited to the patients under 20 year's old, while the prevalence of other anomalies was almost the same in all groups.
  
  
  CONCLUSIONS
  Dilaceration, impaction and taurodontism were relatively common in the studied populaton. A family history of dental anomalies was positive in a third of cases.
authors.affiliation: Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Yazd University of Medical Sciences, Yazd, Iran. afsan40@yahoo.co.uk
authors.forename: Ardakani F
authors.initials: AF
authors.lastname: Ezoddini
authors.forename: M H
authors.initials: MH
authors.lastname: Sheikhha
authors.forename: H
authors.initials: H
authors.lastname: Ahmadi
mesh_terms: D000328:Adult; D000367:Age Factors; D003719:Dens in Dente / Q000453:epidemiology; D003743:Dental Enamel / Q000002:abnormalities; D003786:Dental Pulp Cavity / Q000002:abnormalities; D005260:Female; D005671:Fused Teeth / Q000453:epidemiology; D006801:Humans; D007492:Iran / Q000453:epidemiology; D008297:Male; D015995:Prevalence; D011862:Radiography, Panoramic / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D012737:Sex Factors; D014071:Tooth Abnormalities / Q000000981:diagnostic imaging / Q000453:epidemiology* / Q000235:genetics; D014092:Tooth Root / Q000002:abnormalities; D014095:Tooth, Impacted / Q000453:epidemiology; D014096:Tooth, Supernumerary / Q000453:epidemiology