title: Comparing the effect of 3 orthognathic surgical methods on the mandibular range of movement.
abstract: BACKGROUND
  Mandibular setback for the treatment of mandibular prognathism is a common orthogenetic surgical procedure carried out using various intraoral and extraoral methods. Reduced mandibular movement range (MMR) is one of the common complications of this surgery.
  
  
  OBJECTIVE
  The aim of this study was to compare the reduction of MMR after 3 surgical procedures including sagittal split osteotomy (SSO), intraoral vertical ramus osteotomy (IVRO), extraoral vertical ramus osteotomy (EVRO).
  
  
  METHODS
  In this clinical trial, 150 patients with mandibular prognathism were divided into 3 groups of 50 patients. In the first group, mandibular setback was performed using SSO; in the second group, we used IVRO, and EVRO was the method used in the third group. In each group, before and 3 months after the surgery, maximum interincisal opening and the range of right and left lateral and protrusive movements were measured and compared.
  
  
  RESULTS
  Although the mean amount of MMR reduced in all the groups, it was not equal in all the groups. Sagittal split osteotomy and the EVRO resulted in the most and least reduction of MMR, respectively.
  
  
  CONCLUSIONS
  Reduced MMR is one of the complications of SSO, IVRO, and EVRO; however, SSO resulted in the most and EVRO in the least effect on limitation of movement after surgery.
authors.affiliation: Department of Oral and Maxillo-Facial Surgery, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Javad
authors.initials: J
authors.lastname: Yazdani
authors.forename: Human
authors.initials: H
authors.lastname: Ebrahimi
authors.forename: Kurosh Taheri
authors.initials: KT
authors.lastname: Talesh
authors.forename: Ehsan
authors.initials: E
authors.lastname: Khashabi
authors.forename: Sara
authors.initials: S
authors.lastname: Pourshahidi
authors.forename: Azadeh Andisheh
authors.initials: AA
authors.lastname: Tadbir
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000601:surgery*; D008875:Middle Aged; D019647:Oral Surgical Procedures / Q000379:methods*; D010027:Osteotomy / Q000379:methods*; D011183:Postoperative Complications; D011378:Prognathism / Q000601:surgery*; D016059:Range of Motion, Articular / Q000502:physiology*; D013704:Temporomandibular Joint / Q000502:physiology*; D016896:Treatment Outcome