title: [The analysis of lip contour of class II division 1 malocclusion in the early permanent dentition].
abstract: OBJECTIVE
  To study the lip contour of Class II division 1 malocclusion in the early permanent dentition with different growth patterns and gender.
  
  
  METHODS
  145 patients with Class II division 1 malocclusion in the early permanent dentition were included in this study. Their pre-treatment cephalometric X-rays were measured to analyze the influence of gender and growth pattern on the lateral lip contour. One-way analysis of variance was used to analyze the influence of growth pattern on the lip contour of patients in the early permanent dentition, and t-test was used to analyze the influence of gender on the lip contour of patients.
  
  
  RESULTS
  The lip vertical extension values of male patients were larger than that of female (P < 0.05); the lip sagittal extension value of male seems to be larger too, but no significant difference was found (P > 0.05). The upper lip extension patterns of patients with different growth patterns were the same, but patients of horizontal growth pattern had more everted and protrusive lower lips than patients of vertical growth pattern.
  
  
  CONCLUSIONS
  Gender and growth pattern both have influences on the lip contour of Class II division 1 malocclusion in the early permanent dentition.
authors.affiliation: Dept. of Orthodontics, The Affiliated Hospital of Stomatology, Chongqing Medical University, Chongqing 400015, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wu
authors.forename: Xiao
authors.initials: X
authors.lastname: Deng
authors.forename: Song
authors.initials: S
authors.lastname: Chen
mesh_terms: D002508:Cephalometry; D019229:Dentition, Permanent; D005260:Female; D006801:Humans; D008046:Lip; D008297:Male; D008310:Malocclusion; D008312:Malocclusion, Angle Class II