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Orthopantomograph에 있어서 齒根部像의 變化에 關한 硏究
The Study Of Apical Chances Oh The Orthopantomograph

치과방사선 1979년 9권 1호 p.19 ~ 24

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안형규(安炯珪)/Hyung Kyu Ahn

KMID : 0378219790090010019

Abstract

2例乾燥頭蓋骨에서 特定齒牙의 齒頸部와 齒根端部에 放射綠不透過性物質을 固定시켜 얻
은 Orthopantomogran과 실제 乾燥頭蓋骨에서의 各計測點間의 거리를 計測하고 그 變化率
을 算出함으로써 다음과 같은 結果를 얻을 수 있었단.
1. 齒牙長徑은 上下顎全般的인 擴大現像을 보였으며 臼齒部側이 前齒部보다 큰 擴大率을
나타냈으나 下顎前齒部에 있어서는 上顎前齒部보다 적은 擴大率을 보였다.
2. 齒牙幅徑은 image layer와 실제 乾燥頭骨의 顎弓과의 位置的關係에 左右됨에 따라 대
체적으로 縮小現狀을 보였단.
3. 顎弓은 形態에 따라 同名齒牙라 할지라도 左右側脚의 變化率은 差異가 있었다.
4. 上顎前齒部幅徑에 있어서 齒頸部가 齒根端部보다 큰 縮小現像을 보였다

A study was made primarily to investigate vertical and horizontal distortion of the
image at the apical region of the dental roots in orthopantomographs.
The subjects consisted of two dry skulls with radiopaque materials attached to root
surface.
Measuring of the width and length of each predetermined point at 23 teeth was
performed in dry skulls and radiographic films.
The results obtained were as follows ;
1. There was overall magnification of image in the vertical dimension. And anterior
portion had greater magnification rate than posterior portion while lower anterior portion
had less signification rate than upper anterior portion.
2. There was reduction of the image in the horizontal dimension of the teeth, because
of the position relation between dry skull and image layer of the orthopantomograph.
3. There was a significant difference in distortion rate between the opposite teeth.
4. Cervical portion of the tooth had more decreased rate of horizontal distortion than
apical portion.