title: Concomitant developmental dental anomalies in Chinese children with dens evaginatus.
abstract: OBJECTIVE
  To determine the prevalence of concomitant developmental dental anomalies in a group of Chinese children with dens evaginatus.
  
  
  METHODS
  The dental records and orthopantomograms of 10-15 year old children and adolescents who had been diagnosed with dens evaginatus in a school dental clinic were reviewed retrospectively.
  
  
  RESULTS
  Four hundred and forty-eight of 7102 (6.3%) children were found to have dens evaginatus. Concomitant developmental dental anomalies were found in 77 children (17.2%). The most commonly seen dental anomalies in the study population were hypodontia, hyperdontia, microdontic maxillary lateral incisor, and dental impaction. The prevalence of these anomalies did not differ significantly to that found in the general Chinese population. When analysed separately, however, the prevalence of supernumerary premolars was found to be higher in children with dens evaginatus than in the general population, and the difference was statistically significant (P < 0.01).
  
  
  CONCLUSIONS
  Supernumerary premolars appeared to be more prevalent in Chinese children with dens evaginatus than in the general population. There may be an association of supernumerary premolars with dens evaginatus in this study population.
authors.affiliation: School Dental Care Service, Department of Health, Hong Kong. rony_cho@dh.gov.hk
authors.forename: S Y
authors.initials: SY
authors.lastname: Cho
authors.forename: Y
authors.initials: Y
authors.lastname: Ki
authors.forename: V
authors.initials: V
authors.lastname: Chu
authors.forename: J
authors.initials: J
authors.lastname: Chan
mesh_terms: D000293:Adolescent; D000848:Anodontia / Q000453:epidemiology; D001641:Bicuspid / Q000002:abnormalities*; D002648:Child; D002681:China / Q000208:ethnology; D003481:Cuspid / Q000473:pathology; D005260:Female; D006723:Hong Kong / Q000453:epidemiology; D006801:Humans; D007180:Incisor / Q000002:abnormalities; D008297:Male; D008334:Mandible; D008437:Maxilla; D015995:Prevalence; D011862:Radiography, Panoramic; D012189:Retrospective Studies; D014071:Tooth Abnormalities / Q000453:epidemiology*; D014095:Tooth, Impacted / Q000453:epidemiology; D014096:Tooth, Supernumerary / Q000453:epidemiology