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KMID : 0361920220520030172
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Korean Journal of Orthodontics
2022 Volume.52 No. 3 p.172 ~ p.181
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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
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Kwon Hye-Jin
Park Sun-Hyung
Jung Hoi-In
Hwang Woo-Chan
Choi Yoon-Jeong
Chung Choo-Ryung
Kim Kyung-Ho
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Abstract
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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.
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KEYWORD
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Asymmetry, Class III orthognathic surgery, Bite force, Occlusal contact area
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