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KJO Korean Journal of Orthodontics

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pISSN 2234-7518
eISSN 2005-372X
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Korean J Orthod   

First Published Date January 2, 2023

Copyright © The Korean Association of Orthodontists.

Three-dimensional evaluation of mandibular width after mandibular asymmetric setback surgery using sagittal split ramus osteotomy

Seong-Sik Kima, Sung-Hun Kimb, Yong-Il Kima, Soo-Byung Parka

aProfessor, Department of Orthodontics, Dental Research Institute, and Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, South Korea.
bAssistant professor, Department of Orthodontics, Dental Research Institute, and Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, South Korea.

Correspondence to:Sung-Hun Kim, assistant professor, Department of Orthodontics, Dental Research Institute, and Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, South Korea. 50612, Tel: 82-55-360-5164, Fax: 82-55-360-5154, E-mail: kmule@hanmail.net

Abstract

Objective: The purpose was to evaluate the changes in mandibular width after sagittal split ramus osteotomy (SSRO) in patients with mandibular asymmetric prognathism using conebeam computed tomography (CBCT).
Methods: This study included 70 patients who underwent SSRO for mandibular setback surgery. Two groups, symmetric (n=35) and asymmetric (n=35), were divided according to the differences in their right and left setback amount. The mandibular width was evaluated three-dimensionally using CBCT images taken immediately before surgery (T1), 3 days after surgery (T2), and 6 months after surgery (T3). Repeated measures analysis of variance was applied to statistically verify the differences in mandibular width.
Results: Both groups showed that mandibular width increased significantly at T2, followed by a significant decrease at T3. No significant difference was observed between T1 and T3 in any of the measurements. No significant differences were found between the two groups (P>.05).
Conclusion: After mandibular asymmetric setback surgery using SSRO, the mandibular width increased immediately, but returned to its original width 6 months after surgery.

Keywords: Class III orthognathic surgery, CT, Facial asymmetry

Article

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Korean J Orthod   

First Published Date January 2, 2023

Copyright © The Korean Association of Orthodontists.

Three-dimensional evaluation of mandibular width after mandibular asymmetric setback surgery using sagittal split ramus osteotomy

Seong-Sik Kima, Sung-Hun Kimb, Yong-Il Kima, Soo-Byung Parka

aProfessor, Department of Orthodontics, Dental Research Institute, and Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, South Korea.
bAssistant professor, Department of Orthodontics, Dental Research Institute, and Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, South Korea.

Correspondence to:Sung-Hun Kim, assistant professor, Department of Orthodontics, Dental Research Institute, and Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, South Korea. 50612, Tel: 82-55-360-5164, Fax: 82-55-360-5154, E-mail: kmule@hanmail.net

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective: The purpose was to evaluate the changes in mandibular width after sagittal split ramus osteotomy (SSRO) in patients with mandibular asymmetric prognathism using conebeam computed tomography (CBCT).
Methods: This study included 70 patients who underwent SSRO for mandibular setback surgery. Two groups, symmetric (n=35) and asymmetric (n=35), were divided according to the differences in their right and left setback amount. The mandibular width was evaluated three-dimensionally using CBCT images taken immediately before surgery (T1), 3 days after surgery (T2), and 6 months after surgery (T3). Repeated measures analysis of variance was applied to statistically verify the differences in mandibular width.
Results: Both groups showed that mandibular width increased significantly at T2, followed by a significant decrease at T3. No significant difference was observed between T1 and T3 in any of the measurements. No significant differences were found between the two groups (P>.05).
Conclusion: After mandibular asymmetric setback surgery using SSRO, the mandibular width increased immediately, but returned to its original width 6 months after surgery.

Keywords: Class III orthognathic surgery, CT, Facial asymmetry