Analysis of masseter muscle in facial asymmetry before and after orthognathic surgery using 3-dimensional computed tomography

Seung Ah Seo, Hyoung Seon Baik, Chung Ju Hwang, Hyung Seog Yu

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Objective: The purpose of this study was to understand the differences in masseter muscle (MM) between the shifted and non-shifted sides in facial asymmetry patients, and the changes shown by MM after mandibular surgery. Methods: Pre- and post-operative CT scans were performed on 12 Class III patients with facial asymmetry who were treated by intraoral vertical ramus osteotomy and 10 subjects with normal occlusion. Using the V-works 4.0 program (Cybermed, Seoul, Korea), 3-dimensional images of the mandible, and MM were reconstructed, and evaluated. Results: In the asymmetry group, the MM angle between the shifted and non-shifted sides was only significantly different (p < 0.05). Compared with normal occlusion, the asymmetry group showed a significantly smaller volume and maximum cross-sectional area in both sides of MM (p < 0.05). After mandibular surgery, the angle of MM (p < 0.01) and differences in angle between the shifted and non-shifted sides of MM (p < 0.05) were significantly decreased. The thickness in the maximum cross-sectional area was significantly increased (p < 0.01). After surgery, MM in facial asymmetry patients was similarly changed to those in the normal occlusion group except for widths. Conclusions: MM in facial asymmetry was definitely different from those in normal occlusion. However, this study suggests that MM changed symmetrically in conjunction with the mandible after proper mandibular surgery.

Original languageEnglish
Pages (from-to)18-27
Number of pages10
JournalKorean Journal of Orthodontics
Volume39
Issue number1
DOIs
Publication statusPublished - 2009 Jan 1

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Facial Asymmetry
Orthognathic Surgery
Masseter Muscle
Tomography
Mandible
Korea
Osteotomy

All Science Journal Classification (ASJC) codes

  • Orthodontics

Cite this

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abstract = "Objective: The purpose of this study was to understand the differences in masseter muscle (MM) between the shifted and non-shifted sides in facial asymmetry patients, and the changes shown by MM after mandibular surgery. Methods: Pre- and post-operative CT scans were performed on 12 Class III patients with facial asymmetry who were treated by intraoral vertical ramus osteotomy and 10 subjects with normal occlusion. Using the V-works 4.0 program (Cybermed, Seoul, Korea), 3-dimensional images of the mandible, and MM were reconstructed, and evaluated. Results: In the asymmetry group, the MM angle between the shifted and non-shifted sides was only significantly different (p < 0.05). Compared with normal occlusion, the asymmetry group showed a significantly smaller volume and maximum cross-sectional area in both sides of MM (p < 0.05). After mandibular surgery, the angle of MM (p < 0.01) and differences in angle between the shifted and non-shifted sides of MM (p < 0.05) were significantly decreased. The thickness in the maximum cross-sectional area was significantly increased (p < 0.01). After surgery, MM in facial asymmetry patients was similarly changed to those in the normal occlusion group except for widths. Conclusions: MM in facial asymmetry was definitely different from those in normal occlusion. However, this study suggests that MM changed symmetrically in conjunction with the mandible after proper mandibular surgery.",
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Analysis of masseter muscle in facial asymmetry before and after orthognathic surgery using 3-dimensional computed tomography. / Seo, Seung Ah; Baik, Hyoung Seon; Hwang, Chung Ju; Yu, Hyung Seog.

In: Korean Journal of Orthodontics, Vol. 39, No. 1, 01.01.2009, p. 18-27.

Research output: Contribution to journalArticle

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