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Human Masticatory Muscle Volume and Zygomatico-mandibular Form in Adults with Mandibular Prognathism

¹ Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Dentistry, Osaka University, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan;
² Department of Oral and Maxillofacial Radiology, Graduate School of Dentistry, Osaka University;
³ Department of Pediatric Dentistry and Clinical Genetics and 3D-Laboratory, School of Dentistry, Faculty of Health Sciences, University of Copenhagen, Denmark; and
⁴ The Copenhagen Craniofacial Unit (CCFU), Department of Clinical Genetics, Copenhagen University Hospital;

* corresponding author, ktakada{at}dent.osaka-u.ac.jp

Although several investigators have reported associations between masticatory muscles and skeletal craniofacial form, there is no agreement on the association. We tested the hypothesis that masticatory muscle volume correlates with the size and form of the adjacent local skeletal sites. For this purpose, we investigated the morphological association of the cross-sectional area and volume of temporal and masseter muscles with zygomatico-mandibular skeletal structures using computerized tomography (CT) in 25 male adults with mandibular prognathism. Muscle variables significantly correlated with widths of the bizygomatic arch and temporal fossa but not with the cranium width. Masseter volume significantly correlated with cross-sectional areas of the zygomatic arch and mandibular ramus. Masseter orientation was almost perpendicular to the zygomatic arch and mandibular antegonial region. The zygomatic arch angle significantly correlated with the antegonial angle. The results of the study suggest that the masticatory muscles exert influence on the adjacent local skeletal sites.

KEY WORDS: CT • mandibular prognathism • masticatory muscle • zygomatic arch

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