Journal of Korean Academy of Oral and Maxillofacial Radiology (치과방사선)

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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A STUDY ON MEASUREMENTS OF TOOTH LENGTH IN ORTHOPANTOMOGRAM

Orthopantomogram상에서의 치아 장경 측정에 관한 연구

  • Jeong Chang Hoon (Department of Radiology, College of Dentistry, Chosun University) ;
  • Kim Jae Duk (Department of Radiology, College of Dentistry, Chosun University)
  • 정창훈 (조선대학교 구강악안면방사선학 교실) ;
  • 김재덕 (조선대학교 구강악안면방사선학 교실)
  • Published : 1994.06.01
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Abstract

This study was performed to evaluate the accuracy of orthopantomogram by measuring the actual and radiographic tooth length and by analyzing the vertical magnification rate. For this study, total 90 teeth of the maxilla and mandible teeth and a dry skull were used. This experiment was attached with metal balls of 1±0.02㎜ at the root and the crown cusp tips of central, 2nd premolar, 1st molar of the maxilla and mandible and the teeth were embedded in dry skull, and then orthopantomogram was taken. The obtained results were as follows: 1. The average of tooth length in orthopantomogram was longer than that of actual tooth length. 2. The average of vertical magnification rate in the orthopantomogram to actual tooth length was 17-26%. 3. Vertical magnification rate of the maxilla teeth was 18-26% and that of mandibular teeth was 17-23%, and the magnification of maxillary teeth was larger than that of mandible teeth(P<0.0l). 4. Vertical magnification rate of posterior area was 22-26% and that of anterior area was 17-18%, and the magnification of anterior area was less than that of posterior area(P<0.01).

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