title: Computer-assisted preoperative simulation for positioning and fixation of plate in 2-stage procedure combining maxillary advancement by distraction technique and mandibular setback surgery.
abstract: BACKGROUND
  Computer-assisted preoperative simulation surgery is employed to plan and interact with the 3D images during the orthognathic procedure. It is useful for positioning and fixation of maxilla by a plate. We report a case of maxillary retrusion by a bilateral cleft lip and palate, in which a 2-stage orthognathic procedure (maxillary advancement by distraction technique and mandibular setback surgery) was performed following a computer-assisted preoperative simulation planning to achieve the positioning and fixation of the plate. A high accuracy was achieved in the present case.
  
  
  METHODS
  A 21-year-old male patient presented to our department with a complaint of maxillary retrusion following bilateral cleft lip and palate. Computer-assisted preoperative simulation with 2-stage orthognathic procedure using distraction technique and mandibular setback surgery was planned.
  
  
  CONCLUSIONS
  The preoperative planning of the procedure resulted in good aesthetic outcomes. The error of the maxillary position was less than 1mm.
  
  
  CONCLUSIONS
  The implementation of the computer-assisted preoperative simulation for the positioning and fixation of plate in 2-stage orthognathic procedure using distraction technique and mandibular setback surgery yielded good results.
authors.affiliation: Department of Oral-Maxillofacial Surgery, Dentistry and Orthodontics, The University of Tokyo Hospital, Tokyo, Japan. Electronic address: suenaga-tky@umin.ac.jp.
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Suenaga
authors.affiliation: Department of Oral-Maxillofacial Surgery, Dentistry and Orthodontics, The University of Tokyo Hospital, Tokyo, Japan.
authors.forename: Asako
authors.initials: A
authors.lastname: Taniguchi
authors.affiliation: Department of Oral-Maxillofacial Surgery, Dentistry and Orthodontics, The University of Tokyo Hospital, Tokyo, Japan.
authors.forename: Kazumichi
authors.initials: K
authors.lastname: Yonenaga
authors.affiliation: Department of Oral-Maxillofacial Surgery, Dentistry and Orthodontics, The University of Tokyo Hospital, Tokyo, Japan.
authors.forename: Kazuto
authors.initials: K
authors.lastname: Hoshi
authors.affiliation: Department of Oral-Maxillofacial Surgery, Dentistry and Orthodontics, The University of Tokyo Hospital, Tokyo, Japan.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Takato
keywords: Computer-assisted preoperative simulation; Maxillary distraction osteogenesis; Maxillary positioning; Orthognathic surgery