title: Three-dimensional condylar positions and forms associated with different anteroposterior skeletal patterns and facial asymmetry in Chinese adolescents.
abstract: OBJECTIVE
  To evaluate the association of condylar asymmetry and chin position with different anteroposterior skeletal patterns using three-dimensional models reconstructed from cone-beam computed tomography (CBCT) images.
  
  
  METHODS
  CBCT scans of 123 Chinese adolescents (aged 11-15 years, 68 girls and 55 boys) with 64 skeletal Class I, 46 Class II and 13 Class III were selected from scans of patients attending the orthodontic clinic. The condyles of the subjects were reconstructed bilaterally and 25 linear, angular and volumetric measurements were performed to evaluate the asymmetry of the condyles and position of the chin. The proportions of condylar asymmetry in the different skeletal groups were calculated by the absolute difference value between the left and right sides to the smaller side value. One-way analysis of variance and Pearson's correlations were used to analyse the data.
  
  
  RESULTS
  The values for RV, RCL, LCH, RCH, LCGM, RCGM, LCo-Me and RCo-Me were significantly different among the three skeletal groups (p < 0.05). There were significant positive correlations between Pog-Ss and Co-Sh, Co-Me in the Class I and II groups (p < 0.05). Asymmetries for Co-Ss, Co-Sh, CP and SP between the left and right condyles exceeded a ratio of 20% for more than 30% of the subjects.
  
  
  CONCLUSIONS
  Condylar asymmetry varied significantly among the three skeletal groups, with the vertical position of the condyle (Co-Sh) and height of the mandibular ramus (Co-Me) being significantly and positively related to the chin position.
authors.affiliation: Institute of Stomatology, Nanjing Medical University, Nanjing, PR, China. jsdentsci@hotmail.com
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Bei
authors.initials: B
authors.lastname: Che
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Ni
authors.forename: Hao
authors.initials: H
authors.lastname: Zhang
authors.forename: Yongchu
authors.initials: Y
authors.lastname: Pan
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.forename: Junqing
authors.initials: J
authors.lastname: Ma
mesh_terms: D000293:Adolescent; D002648:Child; D002681:China; D005145:Face; D005260:Female; D006801:Humans; D008297:Male; D008335:Mandibular Condyle / Q000033:anatomy & histology*