title: [Genetic analysis of tooth development and eruption in 82 pairs of female-female twins].
abstract: OBJECTIVE
  To study the heritability of tooth development and eruption.
  
  
  METHODS
  82 pairs of female-female twins between 6-12 years old were collected. Twin zygosity diagnosis were made by DNA-fingerprinting. The number of third molar present, hypodontia, upper lateral incisor malformation and the number of erupted permanent teeth were recorded by oral examination and panoramic radiographs, their heritabilities were calculated.
  
  
  RESULTS
  According to the level of heritability, the dental traits were aligned as follows: the number of third molars present, the upper lateral incisor malformation, hypodontia and the number of erupted permanent teeth.
  
  
  CONCLUSIONS
  Though both the tooth development and its eruption were under genetic influence, the heritability of tooth development was far more than tooth eruption.
authors.affiliation: School of Stomatology, Beijing Medical University, Beijing 100081.
authors.forename: H
authors.initials: H
authors.lastname: Liu
authors.forename: H
authors.initials: H
authors.lastname: Deng
authors.forename: C
authors.initials: C
authors.lastname: Cao
mesh_terms: D000293:Adolescent; D000848:Anodontia / Q000235:genetics; D005260:Female; D006801:Humans; D008964:Molar, Third / Q000254:growth & development; D009805:Odontogenesis / Q000235:genetics*; D014078:Tooth Eruption / Q000235:genetics*