단근 소구치의 근관계에 관한 방사선 사진과 투명표본 간의 일치도

Abstract

The aim of this study was to identify the root canal systems of maxillary and mandibular premolars that had a single root. 142 single rooted premolars were selected and mesio-distal and bucco-lingual views were radopgraphed using intra-oral dental standard films. Four equally trained examiners used the developed radiographs to classify the root canal types. After opening the tooth for access, it was stored in 5% NaOCl to dissolve the pulp tissue, Indian ink was then injected into the pulp cavity to stain the pulp tissue. It was cleared in methyl salicylate after being decalcified with 5% nitric acid for 48 hours, and the root canal type was evaluated at a magnification of ×20 using a stereomicroscope. The results are as follows; 1. The radiographic findings indicated, statistically significant differences in the classification of the root canal types among the examiners (p＜0.05) 2. There were statistically significant differences in the root canal types between the radiographs and clearing samples(p＜0.05). 3. A comparison of the coincidence of each root canal type showed that, there was a higher frequency of correct answer in type Ⅱ and Ⅲ root canals than type I and Ⅳ root canals. 4. Generally, the frequency of the type I and Ⅱ root canal was higher than the type Ⅲ and Ⅳ root canal. In conclusion, there were differences between the radiographs and clearing samples of the root canal types. There might be differences in the root canal types between examiners when the same radiograph is used. Therefore, considering the difficulty in estimating the root canal types, clinicians need to be careful when interpreting radiographs before root canal therapy.