title: Characteristics of lip-mouth region in smiling position from 80 persons with acceptable faces and individual normal occlusions.
abstract: OBJECTIVE
  The characteristics of lip-mouth region including the soft and hard tissues in smiling position with frontal fixed position photographic computer-aided analysis were studied.
  
  
  METHODS
  The subjects were 80 persons (40 male and 40 females, age range: 17 to approximately 25 years) with acceptable faces and individual normal occlusions. The subjects were asked to take maximum smiling position to accept photographic measurement with computer-aided analysis.
  
  
  RESULTS
  The maximum smile line could be divided into 3 categories: low smile line (16.25%), average smile line (68.75%), and high smile line (15%).
  
  
  CONCLUSIONS
  The method adopting maximum smiling position to study the lip-month region is reproducible and comparable. This study would be helpful to provide a quantitative reference for clinical investigation, diagnosis, treatment and efficacy appraisal.
authors.affiliation: Department of Stomatology, Peking Union Medical College Hospital, Beijing 100730.
authors.forename: Jiangheng
authors.initials: J
authors.lastname: Zhang
authors.forename: Yangxi
authors.initials: Y
authors.lastname: Chen
authors.forename: Xiukun
authors.initials: X
authors.lastname: Zhou
mesh_terms: D000293:Adolescent; D000328:Adult; D000886:Anthropometry; D003766:Dental Occlusion; D005260:Female; D006801:Humans; D008046:Lip / Q000033:anatomy & histology*; D008297:Male; D009055:Mouth / Q000033:anatomy & histology*; D012904:Smiling; D014070:Tooth / Q000033:anatomy & histology*