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

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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A RADIOGRAPHIC METHOD FOR DETERMINING THE ACTUAL TOOTH LENGTH

치아장경 측정을 위한 방사선학적 방법

  • Nah Kyung-Soo (Department of Oral Radiology, College of Dentistry, Pusan National University) ;
  • Cho Bong-Hae (Department of Oral Radiology, College of Dentistry, Pusan National University)
  • 나경수 (부산대학교 치과대학 치과방사선학 교실) ;
  • 조봉혜 (부산대학교 치과대학 치과방사선학 교실)
  • Published : 1995.12.01
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Abstract

Tooth length determination is a crucial step in endodontic treatment. Traditionally, radiographs are used to confirm working length of the root length. This study was performed to evaluate the radiographic distortion(magnification) and calculate correction coefficients for the object-film distance. Ninty-six radiographs were made of eight extracted teeth(two upper first premolars, two lower first premolars, two upper first molars, and two lower first molars) by using the 16 inch long cone paralelling techniques with 1mm interval from 5 to 16mm tooth-film distance. The results were as follows. 1. The least mean radiographic distortion from 5 to 16mm tooth-film distance was 2.42±0.68％(the length of mesiobuccal cusp-mesial root of lower first molars), the greatest distortion was 4.74±1.36％(the length of mesiobuccal cusp-mesiobuccal root of upper first molars). 2. The greatest correction coefficient was 0.986(the mesiobuccal cusp-mesial root of lower first molars, the lowest one was 0.937(the mesiobuccal cusp-mesiobuccal root of upper first molars).

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