Imaging Science in Dentistry

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

The relationship among reference lines used for taking the extraoral radiography

구외 방사선사진 촬영에 사용되는 기준선의 상호 관계

  • Lee Sul-Mi (Department of Oral and Maxillofacial Radiology, College of Dentistry, Seoul National University) ;
  • Choi Hang-Moon (Department of Oral and Maxillofacial Radiology, College of Dentistry, Kangnung National University)
  • 이설미 (서울대학교 치과대학 구강악안면방사선학교실) ;
  • 최항문 (강릉대학교 치과대학 구강악안면방사선학교실)
  • Published : 2001.12.01
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Abstract

Purpose : The aim of present study is to estimate the relationship among reference lines used for taking the extraoral radiography and panoramic radiography. Materials and Methods: Lateral cephalographs of 40 adults, aged 22 to 30 years were taken. Angles between reference lines (Frankfort line, canthomeatal line, infraorbitomeatal line, and occlusal plane) were measured. Results: Angles between Frankfort line and canthomeatal line, Frankfort line and infraorbitomeatal line, Frankfort line and occlusal plane, canthomeatal line and infraorbitomeatal line, canthomeatal line and occlusal plane, and infraorbitomeatal line and occlusal plane were 16.1° (±2.2), 5.8° (±2.4), 8.7° (±3.5), 10.3° (±1.3), 24.8° (±4.0), and 14.5° (±4.4),respectively. Conclusion: Angle between frankfort and canthomeatal line is very different with commonly known angle. Frankfort horizontal reference lines used for panoramic radiography need an exact definition and more accurate standard is needed for the taking of panoramic radiograph.

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