Three-dimensional evaluations of the medial pterygoid muscle in patients with mandibular prognathism : Analysis through use of reconstructed CT images

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  • MOMOI,Yutaka
    Department of Orthodontics, Aichi-Gakuin University School of Dentistry
  • ARIJI,Yoshiko
    Department of Oral and Maxillofacial Radiology, Aichi-Gakuin University School of Dentistry
  • KATSUMATA,Akitoshi
    Department of Oral Radiology, Asahi University School of Dentistry
  • YOSHIDA,Kenji
    First Department of Oral and Maxillofacial Surgery:Maxillofacial Deformity clinic, Aichi-Gakuin University School of Dentistry
  • MASUOKA,Naoya
    Department of Orthodontics, Aichi-Gakuin University School of Dentistry
  • NAWA,Hiroyuki
    Department of Orthodontics, Aichi-Gakuin University School of Dentistry
  • ARIJI,Eiichiro
    Department of Oral and Maxillofacial Radiology, Aichi-Gakuin University School of Dentistry
  • GOTO,Shigemi
    Department of Orthodontics, Aichi-Gakuin University School of Dentistry

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  • 下顎前突症患者における内側翼突筋の 3 次元的評価 : CT 画像再構築による分析

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Although many 2-dimensional studies focused on the relationship of the skeletal morphology with the orientation and area of the medial pterygoid muscle, there were very small number of reports for 3-dimentional (3D) evaluations. In this study, we compared the orientation and area of the medial pterygoid muscle of mandibular prongathism patients with those of normal subjects on 3D reconstructed CT images. Thirty mandibular prongathism patients without asymmetry were investigate in comparison with 82 normal subjects. The outline of the muscles were traced and reconstructed 3-dimensionally on a personal computer. The angle and cross-sectional area of the muscles were determined on these 3D images. There were significant difference in orientation and area between normal subjects and patients with progathism (p<0.01). The angle between the FH plane and the muscle orientation was larger in normal subjects those that in previous reports, while the area was slightly smaller. The medial pterygoid muscle orientations (θx and θy) in patients with mandibular prognathism were smaller than those in normal subjects on both frontal and sagittal plane.

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