title: [Management of severe maxillary deficiency through distraction osteogenesis with external distraction device].
abstract: OBJECTIVE
  To demonstrate a practical method for advancement of the midface using Le Fort I osteotomy and gradual distraction technique.
  
  
  METHODS
  With the use of an external adjustable, rigid distraction device, we treated 6 patients with severe maxillary hypoplasia. Ages ranged from 11 to 15 years. They all underwent modified Le Fort I osteotomies assisted by gradual distraction. Four days postoperatively, distraction began at the rate of 1 mm/day for about 2 weeks. 4 weeks with the fixed distraction appliance and 6 weeks with a removable night-time face-mask retention, we then analyzed all those preoperative and postoperative protocols.
  
  
  RESULTS
  Predictable results were obtained. Midface advancement ranged from 8 to 13 mm. A satisfactory class I or II molar relationship is achieved. The aesthetic results are excellent. Up to now, no relapses have been observed.
  
  
  CONCLUSIONS
  This method of modified Le Fort I midface advancement has been shown to be clinically practical and effective.
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Stomatology, Shanghai Second Medical University, Shanghai 200011, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Feng
authors.forename: Y
authors.initials: Y
authors.lastname: Tang
authors.forename: G
authors.initials: G
authors.lastname: Shen
mesh_terms: D000293:Adolescent; D002648:Child; D016267:External Fixators; D006801:Humans; D008297:Male; D008437:Maxilla / Q000002:abnormalities* / Q000601:surgery*; D019857:Osteogenesis, Distraction / Q000295:instrumentation* / Q000379:methods*; D019340:Osteotomy, Le Fort / Q000379:methods