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Orthopantomogram상에서의 치아 장경 측정에 관한 연구
A STUDY ON MEASUREMENTS OF TOOTH LENGTH IN ORTHOPANTOMOGRAM

치과방사선 1994년 24권 1호 p.129 ~ 135

정창훈, 김재덕,

소속 상세정보

정창훈 ( ) - 조선대학교 의과대학 내과학교실
김재덕 ( ) - 조선대학교 구강악안면방사선학 교실

KMID : 0378219940240010129

Abstract

저자는 상,하악 중절치, 제2소구치, 제1대구치 총 90개 치아의 실제 장경을 측정하고 각
치아의 치관교두와 치근단에 방사선불투과성 금속구를 부착하여 건조두개골에 매식한 후 방
사선 촬영하여 얻은 orthopantomogram상에서 치아장경을 측정하여 비교 분석하였으며, 또
한 두치아장경의 수직확대율을 산출하여 다음과 같은 결과를 얻었다.
1. Orthopantomogram상에서의 평균치아 장경은 실제 치아장경보다 더 길게 나타났다.
2. 실제 치아장경에 대한 orthopantomogram상에서의 수직확대율은 평균 17-26%이었다.
3. 상악의 수직확대율은 18-26%로 하악의 수직확대율17-23% 보다 더 컸다(P<0,01).
4. 전치부의 수직확대율은17-18%로 구치부의 수직확대율 22-26% 보다 더 적었다
(P<0.01).
#초록#
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<0.01).
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).