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

Authors
 J W Huh  ;  S Y Kim  ;  Y-B Lee  ;  J H Park  ;  H-D Jung  ;  Y-S Jung 
Citation
 INTERNATIONAL JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY, Vol.49(8) : 1036-1041, 2020-08 
Journal Title
 INTERNATIONAL JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY 
ISSN
 0901-5027 
Issue Date
2020-08
MeSH
Cephalometry ; Facial Asymmetry ; Humans ; Mandible ; Orthognathic Surgical Procedures* ; Osteotomy, Sagittal Split Ramus ; Prognathism* ; Retrospective Studies
Keywords
mandibular asymmetry ; proximal segments ; vertical ramus osteotomy (VRO)
Abstract
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 1month postoperative, and at 1year postoperative. At 1month 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 1year 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.
Full Text
https://www.sciencedirect.com/science/article/pii/S0901502718301565
DOI
10.1016/j.ijom.2018.04.024
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Oral and Maxillofacial Surgery (구강악안면외과학교실) > 1. Journal Papers
Yonsei Authors
Park, Jin Hoo(박진후) ORCID logo https://orcid.org/0000-0003-2337-9554
Jung, Young Soo(정영수) ORCID logo https://orcid.org/0000-0001-5831-6508
Jung, Hwi Dong(정휘동) ORCID logo https://orcid.org/0000-0003-1025-8323
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/179701
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