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Relationship between the masticatory muscles and mandibular skeleton in mandibular prognathism with and without asymmetry.

Cited 21 time in Web of Science Cited 20 time in Scopus
Authors
Ryoo, Hyun-Mo; Kwon, Tae-Geon; Lee, Ki-Ho; Park, Hyo-Sang; Kim, Hyun-Jung; Lee, Sang-Han
Issue Date
2007-08
Publisher
Elsevier
Citation
J Oral Maxillofac Surg 65:1538-1543
Abstract
Purpose
The purpose of the present study was to evaluate the relationship between masticatory muscle volume and mandibular skeletal measurements in patients with and without facial asymmetry. This was done in order to determine whether asymmetric mandibular prognathism is related to masticatory muscle asymmetry.

Patients and Methods
The study was conducted with 40 adult patients with mandibular prognathism composed of 2 groups, the asymmetry group (n = 20) and the nonasymmetry group (n = 20). Using 3-dimensional reformatted computed tomography (CT) images, the volume of masticatory muscle (masseter, temporal, medial, and lateral pterygoid muscles) and various skeletal measurements (hemimandibular volume, ramal height, body length, mandibular length, gonial angle) were evaluated and compared. The right-left difference was expressed by an asymmetry index {(right − left)/left, %}.

Results
The results showed that in the asymmetry group, the longer mandibular side (contralateral side of chin deviation) exhibited longer ramal and body length, a wider gonial angle, and more hemimandibular volume with less medial pterygoid volume, whereas the nonasymmetry group did not show a statistical bilateral difference between the skeletal and muscular measurements. The correlation analysis showed that patients with facial asymmetry did not have similar patterns of muscle-bone relation as compared with the symmetrical subjects.

Conclusion
In patients with mandibular prognathism, the bilateral difference in muscle volume would reflect the difference in the spatial anatomy of a skeletal structure and could not predict mandibular skeletal asymmetry.
ISSN
0278-2391
Language
English
URI
http://hdl.handle.net/10371/69653
DOI
https://doi.org/10.1016/j.joms.2006.09.024
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dentistry (치의학과)Journal Papers (저널논문_치의학과)
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