Three-dimensional changes of proximal segments in facial asymmetry patients after bilateral vertical ramus osteotomy

J. W. Huh, S. Y. Kim, Y. B. Lee, J. H. Park, H. D. Jung, Y. S. Jung

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The intraoral vertical ramus osteotomy (IVRO) is a useful technique for mandibular setback surgery. However, there is a tendency for lateral flaring of the proximal segments on the non-deviation side after the correction of mandibular asymmetry with this technique. The purpose of this retrospective study was to evaluate the positional changes of the proximal segments after IVRO setback in skeletal class III patients with asymmetry, using preoperative and postoperative computed tomography scan data, and to apply the results in clinical practice. A total of 28 skeletal class III patients with asymmetry who underwent bimaxillary orthognathic surgery were included. A three-dimensional cone beam computed tomography scan was obtained preoperative, at 1 month postoperative, and at 1 year postoperative. At 1 month after the surgery, the proximal segments showed an outward rotation, lateral flaring, and anterior rotation of the condylar head. All postsurgical directional changes had returned to the preoperative state at 1 year postoperative, and there was no statistically significant difference in postoperative angulation changes between the two sides. The results showed no statistical differences in the positional changes of the proximal segments between the deviation and non-deviation sides. This study reaffirms the benefits of the IVRO for a minimal bony interference between the proximal and distal segments in three dimensions, including mandibular asymmetry cases.

Original languageEnglish
Pages (from-to)1036-1041
Number of pages6
JournalInternational journal of oral and maxillofacial surgery
Issue number8
Publication statusPublished - 2020 Aug

Bibliographical note

Publisher Copyright:
© 2018 International Association of Oral and Maxillofacial Surgeons

All Science Journal Classification (ASJC) codes

  • Surgery
  • Oral Surgery
  • Otorhinolaryngology


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