Hypodontia and hyperdontia of permanent teeth in Hong Kong schoolchildren

Community Dent Oral Epidemiol. 1987 Aug;15(4):218-20. doi: 10.1111/j.1600-0528.1987.tb00524.x.


This study was performed to determine the prevalence of hypodontia and hyperdontia of permanent teeth amongst Southern Chinese children in Hong Kong. The sample consisted of 1093 12-yr-old children on whom a panoramic radiograph was taken. The prevalence of congenitally missing teeth (third molars excluded) was 6.1% in boys, 7.7% in girls, and 6.9% for both sexes combined. On the average, each child was missing 1.5 teeth. The most commonly absent tooth was the mandibular incisor, affecting 58.7% of the children with hypodontia. Thirty children (2.7%) had supernumerary teeth, with a male:female ratio of 6.5:1; in four cases the tooth had erupted. Three children had fourth molars and one case of a supplemental premolar was recorded (all unerupted). Four cases of a maxillary supernumerary tooth and hypodontia in the mandible were seen.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anodontia / epidemiology*
  • Anodontia / ethnology
  • Child
  • Female
  • Hong Kong
  • Humans
  • Incisor / abnormalities
  • Male
  • Tooth, Supernumerary / epidemiology*
  • Tooth, Supernumerary / ethnology