Relationship between maxillofacial morphology and medial pterygoid muscles in patients with jaw deformities
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概要
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We analyzed and investigated the relationship of maxillofacial morphology with the volume and axial inclination of the medial pterygoid muscle in 23 adult males of average age 26 years, who were diagnosed with skeletal mandibular prognathism at the Osaka Dental University Hospital. Various maxillofacial parameters were measured in the frontal and lateral cephalograms of each subject. Also, using head MRI, the medial pterygoid muscle was reconstructed in three dimensions and its volume and axial inclination were ascertained. Using these data, correlation analysis was conducted at the 5% significance level. When the mandible was inclined laterally, analysis in the coronal plane showed no significant correlation between maxillofacial morphology and the asymmetry index for the volume (Al-volume). Also, a greater asymmetry index for the inclination (Al-inclination) resulted in a greater Ag line angle and a greater distance of ORP to Me. Furthermore, rotation of the mandible did not significantly change the relationship between maxillofacial morphology and asymmetry in volume and inclination. Analysis in the sagittal plane showed that the greater the muscle volume, the greater the A-B plane angle; and the greater the anterior axial inclination, the greater the posterior facial height. However, a greater anterior axial inclination caused a smaller FMA, FH-occlusal plane angle and SN-GoGn. This implies that in patients with skeletal mandibular prognathism, the type of mandibular displacement affects the axial inclination of the medial pterygoid muscle. Also, the results suggest that the axial inclination of the medial pterygoid muscle correlates to the inclination of the occlusal and mandibular planes.
著者
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Yotsui Yoritaka
Department Of Oral Radiology Osaka Dental University
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Matsumoto Naoyuki
Department Of Orthodontics Osaka Dental University
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Eto Miki
Graduate School Of Dentistry (orthodontics) Osaka Dental University
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Eto Miki
Graduate School Of Comprehensive Human Sciences University Of Tsukuba
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Ota Chikako
Department of Orthodontics, Osaka Dental University
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Ota Chikako
Department Of Orthodontics Osaka Dental University
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Matsumoto Naoyuki
Department and Faculty of Engineering, Graduate School, Chiba Institute of Technology
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