Abstract
The aim of this study was to evaluate postoperative relapse after the surgical correction
of skeletal Class III deformities of various facial patterns as a guide to surgical
planning. A retrospective cohort study of 90 consecutive patients with skeletal Class
III malocclusion who underwent bimaxillary surgery was performed. The surgical outcomes
and postoperative stability were compared. The primary predictor variable was vertical
facial type, which was classified into three groups according to the Frankfort mandibular
plane angle (FMA). The primary outcome of angular and linear measurements was obtained
using serial cone beam computed tomography scans obtained at time points of preoperative,
1 week after surgery, and orthodontic debonding. No significant difference in skeletal
relapse was observed in patients with the different vertical facial types. The mandible
displayed a forward and upward relapse in all three groups postoperatively. The patients
with a low FMA exhibited a more consistent mandibular relapse pattern than those with
a normal or high FMA. These findings suggest that bimaxillary surgery is clinically
stable for mandibular prognathism regardless of the vertical facial pattern. However,
1–1.5 mm of overcorrection in the mandible setback should be considered in patients
with a low FMA, because of the greater facial depth and consistent forward and upward
mandibular relapse pattern.
Keywords
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Article info
Publication history
Published online: June 21, 2022
Accepted:
May 27,
2022
Identification
Copyright
© 2022 International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.
