The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Comparison of the bite force and occlusal contact area of the deviated and non-deviated sides after intraoral vertical ramus osteotomy in skeletal Class III patients with mandibular asymmetry: Two-year follow-up

  • Kwon, Hyejin (Department of Orthodontics, College of Dentistry, Yonsei University) ;
  • Park, Sun-Hyung (Department of Orthodontics, The Institute of Craniofacial Deformity, College of Dentistry, Yonsei University) ;
  • Jung, Hoi-In (Department of Preventive Dentistry and Public Oral Health, College of Dentistry, Yonsei University) ;
  • Hwang, Woo-Chan (Department of Orthodontics, College of Dentistry, Yonsei University) ;
  • Choi, Yoon Jeong (Department of Orthodontics, The Institute of Craniofacial Deformity, College of Dentistry, Yonsei University) ;
  • Chung, Chooryung (Department of Orthodontics, The Institute of Craniofacial Deformity, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University) ;
  • Kim, Kyung-Ho (Department of Orthodontics, The Institute of Craniofacial Deformity, Gangnam Severance Dental Hospital, College of Dentistry, Yonsei University)
  • Received : 2021.09.07
  • Accepted : 2021.12.18
  • Published : 2022.05.25
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Abstract

Objective: The objectives of this study were to compare the time-dependent changes in occlusal contact area (OCA) and bite force (BF) of the deviated and non-deviated sides in mandibular prognathic patients with mandibular asymmetry before and after orthognathic surgery and investigate the factors associated with the changes in OCA and BF on each side. Methods: The sample consisted of 67 patients (33 men and 34 women; age 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 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 increased after surgery on both sides. The OCA and BF were significantly greater 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 had a significant effect on 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

Acknowledgement

The study was supported by a faculty research grant of Yonsei University College of Dentistry (6-2017-0022).

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