근관장 측정에서 방사선 사진술의 정확도

Abstract

For the successful endodontic treatment, root canal should be cleaned thoroughly by accurate mechanical and chemical canal preparation and sealed completely with canal ailing material without damaging the periapical tissues. The accuracy of the root canal length measurement is a prerequisite for the success of the endodontic treatment, and the root canal length is often determined by the standard periapical radiographs and digital tactile sense. In this study, the accuracy and the clinical usefulness of DigoraR, an intraoral digital imaging processor and the conventional standard radiographs were compared by measuring the length from the top of the file to the root apex. 30 single rooted premolars were invested in a uniformly sized blocks and No.25 K-file was inserted into and fined in each canal. Each block was placed in equal distance and position to satisfy the principle of the bisecting angle and paralleling techniques and DigoraR, system's image and standard Periapical radiograph were taken. Each radiograph was examined by 3 different observers by measuring the length from top of the file to the root apex and each data was compared and analyzed. The results were as follows ; 1. In the bisecting angle technique, the average difference between the DigoraR, system and standard Periapical radiograph was 0.002 ㎜ and the standard deviasion was 0.341 ㎜ which showed no statistically significant difference between the two systems(p>0.05). Also, in the paralleling technique, the average difference between these two system was 0.007 ㎜ and the standard deviation was 0.323 p>0.05). 2. In DigoraR, system, the average difference between the bisecting angle and paralleling technique was -0.336 ㎜ and the standard deviation was 0.472 ㎜ which showed a statistically significant difference between the two techniques(p>0.05). Also, in the standard periapical radiographs, the average difference between the bisecting an히e and paralleling technique was 0.336 ㎜ and the standard deviation was 0.517 ㎜ which showed a statistically significant difference between these two techniques(p<0.05) . 3. In DigoraR, system and the standard periapical radiographs, there was a statistically significant difference between the measurement using the bisecting angle technique and the actual length (p<0.05). But there was no statistically significant difference between the measurement using the paralleling technique and the actual length (p>0.05). In conclusion, the determination of the root canal length by using the DigoraR, system can give us as good an image as the standard periapical, radiograph and using the Paralleling technique instead of the bisecting angle technique can give a measurement closer to the actual canal length, thereby contributing to a successful result. Also, considering the advantages of the digital imaging processor such as decreasing the amount of exposure to the patient, immediate use of the image, magnification of image size, control of the contrast and brightness and the ability of storing the image can give us good reason to replace the standard periapical radiographs.