title: Effect of open rhinoplasty on the smile line.
abstract: OBJECTIVE
  Open rhinoplasty is an esthetic surgical technique that is becoming increasingly popular, and can affect the nose and upper lip compartments. The aim of this study was to evaluate the effect of open rhinoplasty on tooth show and the smile line.
  
  
  METHODS
  The study participants were 61 patients with a mean age of 24.3 years (range, 17.2 to 39.6 years). The surgical procedure consisted of an esthetic open rhinoplasty without alar resection. Analysis of tooth show was limited to pre- and postoperative (at 12 months) tooth show measurements at rest and the maximum smile with a ruler (when participants held their heads naturally). Statistical analyses were performed with SPSS 13.0, and paired-sample t tests were used to compare tooth show means before and after the operation.
  
  
  RESULTS
  Analysis of the rest position showed no statistically significant change in tooth show (P = .15), but analysis of participants' maximum smile data showed a statistically significant increase in tooth show after surgery (P < .05). In contrast, Pearson correlation analysis showed a positive relation between rhinoplasty and tooth show increases in maximum smile, especially in subjects with high smile lines.
  
  
  CONCLUSIONS
  This study shows that the nasolabial compartment is a single unit and any change in 1 part may influence the other parts. Further studies should be conducted to investigate these interactions.
authors.affiliation: Chamran Hospital, Shiraz University of Medical Science, Shiraz, Iran. Tabmed@gmail.com
authors.forename: Reza
authors.initials: R
authors.lastname: Tabrizi
authors.forename: Hoori
authors.initials: H
authors.lastname: Mirmohamadsadeghi
authors.forename: Danadokht
authors.initials: D
authors.lastname: Daneshjoo
authors.forename: Samira
authors.initials: S
authors.lastname: Zare
mesh_terms: D000293:Adolescent; D000328:Adult; D004954:Esthetics; D004955:Esthetics, Dental; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008046:Lip / Q000033:anatomy & histology*; D008297:Male; D009666:Nose / Q000033:anatomy & histology; D011446:Prospective Studies; D012225:Rhinoplasty / Q000379:methods*; D012904:Smiling; D014070:Tooth / Q000033:anatomy & histology; D055815:Young Adult