Evaluation of normal masseter muscles on ultrasonography

초음파영상을 이용한 정상 교근의 평가

  • Hwang, Hyoung-Zoo (Department of Oral and Maxillofacial Radiology, School of Dentistry, Kyung Hee University) ;
  • Kim, Gyu-Tae (Department of Oral and Maxillofacial Radiology, School of Dentistry, Kyung Hee University) ;
  • Choi, Yong-Suk (Institute of Oral Biology, School of Dentistry, Kyung Hee University) ;
  • Hwang, Eui-Hwan (Institute of Oral Biology, School of Dentistry, Kyung Hee University)
  • 황형주 (경희대학교 치의학전문대학원 구강악안면방사선학교실) ;
  • 김규태 (경희대학교 치의학전문대학원 구강악안면방사선학교실) ;
  • 최용석 (경희대학교 치의학전문대학원 구강생물학연구소) ;
  • 황의환 (경희대학교 치의학전문대학원 구강생물학연구소)
  • Published : 2008.06.30

Abstract

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 $x^2$-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.

Keywords