title: [Comparison of condylar position between Angle Class I and Class II malocclusion in teenagers].
abstract: OBJECTIVE
  To analyze and compare the difference of condylar position between Angle Class I and Class II malocclusion patients using cone-beam CT (CBCT).
  
  
  METHODS
  Thirty Class I patients, 30 Class II division 1 patients and 30 Class II division 2 patients were selected in this study. Each patient underwent CBCT. The images in the oblique position perpendicular to the condyloid process were reconstructed by Examvision software. The joint space was measured by Exam Vision software. The data were processed with SPSS17.0 software package.
  
  
  RESULTS
  The upper joint space was larger in Class II, the posterior joint space was smaller in Class II patients; and in Class II division 1 patients, both of the upper and anterior joint spaces were larger than in Class II division 2 patients，the differences were significant (P<0.05). The length of condyle was longer in Class I patients than in Class II patients.
  
  
  CONCLUSIONS
  The condylar position in Class II division 2 patients was lower and further backward. The length of condyle is shortest in Class II division 2 patients.
authors.affiliation: Department of Orthodontics, Stomatological Hospital of Nantong City. Nantong 226001. E-mail:ntskqyygyj@126.com.
authors.forename: Yong-Jia
authors.initials: YJ
authors.lastname: Gu
authors.forename: Sheng-Nan
authors.initials: SN
authors.lastname: Lu
authors.forename: Mei-Qin
authors.initials: MQ
authors.lastname: Gao
authors.forename: Xin-Yu
authors.initials: XY
authors.lastname: Gu
authors.forename: Hui
authors.initials: H
authors.lastname: Shi
authors.forename: Jun-Qing
authors.initials: JQ
authors.lastname: Ma
mesh_terms: D000293:Adolescent; D054893:Cone-Beam Computed Tomography; D006801:Humans; D008310:Malocclusion; D008311:Malocclusion, Angle Class I / Q000473:pathology*; D008312:Malocclusion, Angle Class II / Q000473:pathology*; D008335:Mandibular Condyle; D012984:Software; D013704:Temporomandibular Joint