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KJO Korean Journal of Orthodontics

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Korean J Orthod

Published online December 20, 2021

Copyright © The Korean Association of Orthodontists.

Comparison of bite force and occlusal contact area between the deviated and non-deviated sides after intraoral vertical ramus osteotomy in skeletal Class III patients with mandibular asymmetry: two-year follow-up

*Hyejin Kwon, Postgraduate student, Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea
*Sun-Hyung Park, Clinical assistant professor, Department of Orthodontics, The Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea
Hoi-In Jung, Assistant professor, Department of Preventive Dentistry and Public Oral Health, College of Dentistry, Yonsei University, Seoul, Korea
Woo-Chan Hwang, Postgraduate student, Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea
Yoon-Jeong Choi, Associate professor, Department of Orthodontics, The Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea
Choo-Ryung Chung, Professor, Department of Orthodontics, The Institute of Craniofacial Deformity, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea
Kyung-Ho Kim, Professor, Department of Orthodontics, The Institute of Craniofacial Deformity, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea

Correspondence to:Kyung-Ho Kim, Professor, Department of Orthodontics, The Institute of Craniofacial Deformity, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea 211, Eonju-ro, Gangnam-gu, Seoul 06273, Korea
Tel +82-2-2019-3562 e-mail, khkim@yuhs.ac
* Contributed equally to this work.

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

Objectives: The objectives of this study were to compare the time-dependent changes in occlusal contact area (OCA) and the bite force (BF) between deviated side and non-deviated side in mandibular prognathic patients with mandibular asymmetry before and after orthognathic surgery, and to investigate the factors associated with the changes in OCA and BF on each side. Methods: The sample consisted of 66 patients (32 men and 34 women; range 15-36 years) with facial asymmetry who underwent 2-jaw orthognathic surgery. OCA and BF were taken before presurgical orthodontic treatment, within 1 month before surgery, and at 1 month, 3 months, 6 months, 1 year, and 2 years after surgery. OCA and BF were measured using the Dental Prescale System. Results: The OCA and BF decreased gradually before surgery and then increased after surgery on both sides. The OCA and BF were significantly larger on the deviated side than on the non-deviated side before surgery, and there was no difference after surgery. According to the linear mixed-effect model, only the changes in the mandibular plane angle showed a significant effect on the OCA and BF (p<0.05). Conclusions: There was a difference in the amount of the OCA and BF between the deviated and non-deviated sides before surgery. The change in mandibular plane angle affects the change, especially on the non-deviated side, during the observation period.

Keywords: Asymmetry, Class III orthognathic surgery, bite force, occlusal contact area

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Korean J Orthod

Published online December 20, 2021

Copyright © The Korean Association of Orthodontists.

Comparison of bite force and occlusal contact area between the deviated and non-deviated sides after intraoral vertical ramus osteotomy in skeletal Class III patients with mandibular asymmetry: two-year follow-up

*Hyejin Kwon, Postgraduate student, Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea
*Sun-Hyung Park, Clinical assistant professor, Department of Orthodontics, The Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea
Hoi-In Jung, Assistant professor, Department of Preventive Dentistry and Public Oral Health, College of Dentistry, Yonsei University, Seoul, Korea
Woo-Chan Hwang, Postgraduate student, Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea
Yoon-Jeong Choi, Associate professor, Department of Orthodontics, The Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea
Choo-Ryung Chung, Professor, Department of Orthodontics, The Institute of Craniofacial Deformity, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea
Kyung-Ho Kim, Professor, Department of Orthodontics, The Institute of Craniofacial Deformity, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea

Correspondence to:Kyung-Ho Kim, Professor, Department of Orthodontics, The Institute of Craniofacial Deformity, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University, Seoul, Korea 211, Eonju-ro, Gangnam-gu, Seoul 06273, Korea
Tel +82-2-2019-3562 e-mail, khkim@yuhs.ac
* Contributed equally to this work.

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

Objectives: The objectives of this study were to compare the time-dependent changes in occlusal contact area (OCA) and the bite force (BF) between deviated side and non-deviated side in mandibular prognathic patients with mandibular asymmetry before and after orthognathic surgery, and to investigate the factors associated with the changes in OCA and BF on each side. Methods: The sample consisted of 66 patients (32 men and 34 women; range 15-36 years) with facial asymmetry who underwent 2-jaw orthognathic surgery. OCA and BF were taken before presurgical orthodontic treatment, within 1 month before surgery, and at 1 month, 3 months, 6 months, 1 year, and 2 years after surgery. OCA and BF were measured using the Dental Prescale System. Results: The OCA and BF decreased gradually before surgery and then increased after surgery on both sides. The OCA and BF were significantly larger on the deviated side than on the non-deviated side before surgery, and there was no difference after surgery. According to the linear mixed-effect model, only the changes in the mandibular plane angle showed a significant effect on the OCA and BF (p<0.05). Conclusions: There was a difference in the amount of the OCA and BF between the deviated and non-deviated sides before surgery. The change in mandibular plane angle affects the change, especially on the non-deviated side, during the observation period.

Keywords: Asymmetry, Class III orthognathic surgery, bite force, occlusal contact area