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Maxillofacial Plastic and Reconstructive Surgery
Published in: Maxillofacial Plastic and Reconstructive Surgery 1/2018

Open Access 01-12-2018 | Research

Positional change in mandibular condyle in facial asymmetric patients after orthognathic surgery: cone-beam computed tomography study

Authors: Byung-Joon Choi, Byung-Soo Kim, Ji-Min Lim, Junho Jung, Jung-Woo Lee, Joo-Young Ohe

Published in: Maxillofacial Plastic and Reconstructive Surgery | Issue 1/2018

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Abstract

Background

We evaluated change in the mandibular condyle after orthognathic surgery using cone-beam computed tomography (CBCT) in patients with facial asymmetry.

Methods

Thirty patients with skeletal class III malocclusion and mandibular prognathism or facial asymmetry were classified into two groups according to the amount of menton deviation (MD) from the facial midline on anteroposterior (AP) cephalogram: group A (asymmetry, MD ≥ 4 mm; n = 15) and group B (symmetry, MD < 4 mm; n = 15). Position and angle of condylar heads on the axial, sagittal, and coronal views were measured within 1 month preoperatively (T0) and postoperatively (T1) and 6 months (T2) postoperatively.

Results

On axial view, both groups showed inward rotation of condylar heads at T1, but at T2, the change was gradually removed and the condylar head returned to its original position. At T1, both groups showed no AP condylar head changes on sagittal view, although downward movement of the condylar heads occurred. Then, at T2, the condylar heads tended to return to their original position. The change in distance between the two condylar heads showed that they had moved outward in both groups, causing an increase in the width between the two heads postoperatively. Analysis of all three-dimensional changes of the condylar head positions demonstrated statistically significant changes in the three different CBCT views in group B and no statistically significant changes in group A.

Conclusions

There was no significant difference between the two groups in condylar head position. Because sagittal split ramus osteotomy can be performed without significant change in symmetrical and asymmetrical cases, it can be regarded as an effective method to stabilize the condylar head position in patients with skeletal class III malocclusion and mandibular prognathism or facial asymmetry.
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Metadata
Title
Positional change in mandibular condyle in facial asymmetric patients after orthognathic surgery: cone-beam computed tomography study
Authors
Byung-Joon Choi
Byung-Soo Kim
Ji-Min Lim
Junho Jung
Jung-Woo Lee
Joo-Young Ohe
Publication date
01-12-2018
Publisher
Springer Berlin Heidelberg
Published in
Maxillofacial Plastic and Reconstructive Surgery / Issue 1/2018
Electronic ISSN: 2288-8586
DOI
https://doi.org/10.1186/s40902-018-0152-6

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