TY - JOUR
T1 - Size and orientation of masticatory muscles in patients with mandibular laterognathism
AU - Goto, T. K.
AU - Nishida, S.
AU - Yahagi, M.
AU - Langenbach, G. E.J.
AU - Nakamura, Y.
AU - Tokumori, K.
AU - Sakai, S.
AU - Yabuuchi, H.
AU - Yoshiura, K.
N1 - Funding Information:
We are grateful to Yuko Nakamura, Faculty of Dental Science, Kyushu University, for her assistance in data analysis, and to Professor Theo van Eijden, Department of Functional Anatomy, Academic Centre for Dentistry Amsterdam (ACTA), for critically reading the manuscript. Expert statistical advice was provided by Tomomi Yamada of the Department of Medical Information Science, Kyushu University Hospital, and by Professor Masashi Sugisaki, Department of Dentistry, Jikei University School of Medicine. We also thank the radiological technologists of the Department of Medical Technology, Kyushu University Hospital, for their support in the MR examinations, and Hitomi Nibe, Kyushu University, for her secretarial work. This study was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Japan (No. 16591887) and by the Kyushu University Foundation.
PY - 2006/6
Y1 - 2006/6
N2 - Size measurements of jaw muscles reflect their force capabilities and correlate with facial morphology. Using MRI, we examined the size and orientation of jaw muscles in patients with mandibular laterognathism in comparison with a control group. We hypothesized that the muscles of the deviated side would be smaller than those of the non-deviated side, and that the muscles of both sides would be smaller than in controls. In patients, a comparison of deviated and non-deviated sides showed, in orientation, differences for masseter and medial pterygoid muscles, but, in size, differences only for the masseter muscle. Nevertheless, muscle sizes in patients were much smaller than in controls. Lateral displacement of the mandible can explain the orientation differences, but not the smaller muscle size, in patients. It is possible that the laterodeviation initiates an adaptive process in the entire jaw system, resulting in extensive atrophy of the jaw muscles.
AB - Size measurements of jaw muscles reflect their force capabilities and correlate with facial morphology. Using MRI, we examined the size and orientation of jaw muscles in patients with mandibular laterognathism in comparison with a control group. We hypothesized that the muscles of the deviated side would be smaller than those of the non-deviated side, and that the muscles of both sides would be smaller than in controls. In patients, a comparison of deviated and non-deviated sides showed, in orientation, differences for masseter and medial pterygoid muscles, but, in size, differences only for the masseter muscle. Nevertheless, muscle sizes in patients were much smaller than in controls. Lateral displacement of the mandible can explain the orientation differences, but not the smaller muscle size, in patients. It is possible that the laterodeviation initiates an adaptive process in the entire jaw system, resulting in extensive atrophy of the jaw muscles.
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U2 - 10.1177/154405910608500614
DO - 10.1177/154405910608500614
M3 - Article
C2 - 16723654
AN - SCOPUS:33745330725
SN - 0022-0345
VL - 85
SP - 552
EP - 556
JO - Journal of Dental Research
JF - Journal of Dental Research
IS - 6
ER -