title: Pivot technique combined with mandibular backward distraction osteogenesis for the patient with high risk for relapse.
abstract: Severe skeletal relapse is one of the most difficult problems after mandibular advancement, and the management to overcome such problems tends to require more compromised methods and longer treatment period. We described that mandibular backward distraction osteogenesis with maxillomandibular fixation at an appropriate occlusion. Furthermore, to avoid inappropriate distraction vector, the distal plates of the distraction device were fixed with 1 screw to work as a pivot after the manipulation of the condyle to the glenoid fossa at the end of distraction activation. This technique was applied to 3 female patients with mandibular deficiency. The intraoral distractors were set on the lateral surface of the mandibular body; the fixation of the distal plate was fixed with 1 monocortical screw to make the proximal segment including the condyle manipulating at the end of the distraction phase by releasing the maxillomandibular fixation. The distraction rate was 1 mm/d, and the latency period was 7 days. The follow-up period after mandibular backward distraction osteogenesis ranged from 26 to 56 months. No specific complication, such as broken device, severe infection, or bony nonunion, occurred. Postoperative relapse was not observed during the follow-up period. This technique might become 1 choice to apply for mandibular deficiency in a patient with high risk for relapse.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Division of Oral and Maxillofacial Reconstructive Surgery, Kyushu Dental College, Kitakyushu, Japan. k-yama@kyu-dent.ac.jp
authors.forename: Kensuke
authors.initials: K
authors.lastname: Yamauchi
authors.forename: Tetsu
authors.initials: T
authors.lastname: Takahashi
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kaneuji
authors.forename: Shinnosuke
authors.initials: S
authors.lastname: Nogami
authors.forename: Ikuya
authors.initials: I
authors.lastname: Miyamoto
authors.forename: Bernd
authors.initials: B
authors.lastname: Lethaus
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008312:Malocclusion, Angle Class II / Q000601:surgery*; D008334:Mandible / Q000601:surgery; D019186:Mandibular Advancement / Q000009:adverse effects*; D019857:Osteogenesis, Distraction / Q000295:instrumentation / Q000379:methods*; D012008:Recurrence