Imaging Science in Dentistry

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
권호 표지

Evaluation of masticatory muscles of mandibular asymmetry patients by computed tomography

전산화단층사진을 이용한 하악골 비대칭 환자의 저작근 평가

  • Choi Soon-Chul (Dept. of Oral and Maxillofacial Radiology, Dental Research Institute, and BK21, College of Dentistry, Seoul National University) ;
  • Lee Sun-Bok (Dept. of Oral and Maxillofacial Radiology and Dental Research Institute, College of Dentistry, Seoul National University) ;
  • Lee Jin-Koo (Dept. of Oral and Maxillofacial Radiology and Dental Research Institute, College of Dentistry, Seoul National University) ;
  • Yi Won-Jin (Dept. of Oral and Maxillofacial Radiology, Dental Research Institute, and BK21, College of Dentistry, Seoul National University) ;
  • Heo Min-Suk (Dept. of Oral and Maxillofacial Radiology, Dental Research Institute, and BK21, College of Dentistry, Seoul National University) ;
  • Lee Sam-Sun (Dept. of Oral and Maxillofacial Radiology, Dental Research Institute, and BK21, College of Dentistry, Seoul National University)
  • 최순철 (서울대학교 치과대학 구강악안면방사선학교실, 치학연구소 및 BK21) ;
  • 이선복 (서울대학교 치과대학 구강악안면방사선학교실 및 치학연구소) ;
  • 이진구 (서울대학교 치과대학 구강악안면방사선학교실 및 치학연구소) ;
  • 이원진 (서울대학교 치과대학 구강악안면방사선학교실, 치학연구소 및 BK21) ;
  • 허민석 (서울대학교 치과대학 구강악안면방사선학교실, 치학연구소 및 BK21) ;
  • 이삼선 (서울대학교 치과대학 구강악안면방사선학교실, 치학연구소 및 BK21)
  • Published : 2004.03.01
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Abstract

Purpose: To compare the size of the masseter and lateral pterygoid muscle between the affected and the unaffected side of the patients who have the chief complaints of the mandibular asymmetry. Materials and Methods: Twenty two patients (male: 4, female: 18, average age: 21.3 year-old) were radiographed using posterior-anterior (P-A) cephalography and computed tomography (CT). On P-A cephalography, the degree of deviation was determined by the distance from the mentum to the vertical reference line through the crista galli and the anterior nasal spine. On the scanned tracing papers of the maximum cross-sectional area of the masseter and lateral pterygoid muscle using axial CT images, the pixel number was measured. The ratio of the affected : unaffected sides were obtained. For the masseter and lateral pterygoid muscle, the relationship between the muscular volume and degree of skeletal hypoplasia was studied. Results : The half cases showed no skeletal asymmetry. The lateral pterygoid muscle of the affected side was larger significantly than unaffected side (p<0.05). However, there was no significant difference between two sides in the cases of skeletal asymmetry. There was only significant difference in the cases without skeletal asymmetry (p<0.05). Conclusions : To some extent, the slight mandibular hypoplasia could affect the growth of some masticatory muscles.

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