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KMID : 0896020080380020073
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Korean Journal of Oral and Maxillofacial Radiology
2008 Volume.38 No. 2 p.73 ~ p.79
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Evaluation of normal masseter muscles on ultrasonography
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Hwang Hyoung-Zoo
Kim Gyu-Tae
Choi Yong-Suk
Hwang Eui-Hwan
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Abstract
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Purpose: To assess the internal echo intensity and morphological variability of masseter muscles on ultrasonography and to establish diagnostic criterion of estimation.
Materials and Methods: Participants consisted of 50 young adults (male 25, female 25) without pathologic conditions and with full natural dentitions. Sonographic examinations were done with real time ultrasound equipment as
Logiq 500 (GE Medical Systems, Seoul, Korea) at 3 parts according to lines paralleling with ala-tragus line as reference
line. The thickness and area of masseter muscles according to reference line in cross-sectional images were measured at rest and at maximum contraction. The visibility and width of the internal echogenic intensity of the masseter muscles were also assessed and the muscle appearance was classified into 4 types. Data were statistically analyzed by paired t-test and x2-test.
Results: 1. When comparing the thickness and area of masseter muscles concerning with gender, there was few
significant difference between right and left sides, however, there were significant differences between males and
females except for the greatest thickness of left side. 2. The changes of the greatest thickness and the area between rest and maximum contraction showed that the part of the least thickness manifested more increase at maximum contraction.
3. Each part the manifestations of the internal echogenic intensity of the masseter muscles were different depending
on the locations. But there was no statistically significance.
Conclusion: Changes of muscles thickness with contraction and internal echogenic intensity with locations showed great disparity within the masseter muscles, which will be diagnostic criteria for pathophysiologic and anatomic
changes of masseter muscles.
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KEYWORD
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Ultrasonography, Masseter muscles, Anatomy, Cross-sectional
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