title: Effect of orthodontic treatment on lip position.
abstract: Does an advanced or retracted position of the upper and lower incisors lead to modifications in lip position? The aim of our study was to evaluate modifications in lip position following orthodontic treatments.
  
  
  METHODS
  This study concerned 100 patients who underwent treatment in the dento-facial orthopedic unit in Casablanca. Profile headfilms at the start and at the end of orthodontic treatment were compared using Frapier's analysis. The Student test was applied to evaluate the variations in the cephalometric measurements.
  
  
  RESULTS
  We noted a non-significant increase in the nasolabial angle (P = 0.274), a significant decrease in the sagittal position of the lower vermillion border (PsVei) (P < 0.001) and the sagittal position of the soft-tissue supramentale (PsSmc) (P < 0.001), and a significant increase in the vertical position of the soft-tissue menton (PvMec) (P = 0.035).
  
  
  CONCLUSIONS
  The results of this study demonstrate marked improvements in the situation of soft tissues. We suggest further investigation to throw light on the relationship between tooth movement and soft tissue, increasing the size of the sample and taking growth into account.
authors.affiliation: Département d'orthopédie dento-faciale, faculté de médecine dentaire de Casablanca, université Hassan II Ain Chok, rue Abou Al Alaâ zahar (ex Vésal), BP 9157, Mers Sultan, Casablanca, Morocco. faridbourzgui@yahoo.fr
authors.forename: Farid
authors.initials: F
authors.lastname: Bourzgui
authors.forename: Sanaa
authors.initials: S
authors.lastname: Alami
authors.forename: Mourad
authors.initials: M
authors.lastname: Sebbar
authors.forename: Taoufik
authors.initials: T
authors.lastname: Derkaoui
authors.forename: Mouna
authors.initials: M
authors.lastname: Hamza
authors.forename: Zineb
authors.initials: Z
authors.lastname: Serhier
authors.forename: Mohamed
authors.initials: M
authors.lastname: Bennani Othmani
mesh_terms: D002508:Cephalometry; D006801:Humans; D007180:Incisor; D008046:Lip / Q000033:anatomy & histology*; D060052:Nasolabial Fold / Q000033:anatomy & histology; D057887:Overbite / Q000628:therapy; D012189:Retrospective Studies; D014087:Tooth Movement Techniques
keywords: Cephalometrics; Incisal repositioning; Lip position; Orthodontic treatment