A STUDY ON THE ROOT CANAL SIZE AND MORPHOLOGY AT APICAL 5MM AREA OF HUMAN MANDIBULAR FIRST MOLAR

하악제 1 대구치 치근단부위의 근관형태 및 크기에 관한 연구

Thirty mandibular first molars were fixed, decalcified, washed and embedded in paraffin to observe the root canal size and morphology at apical 5mm area. The results were as follows 1. The 55% of mesial canals were single-canaled at apical 5mm area, but 95% of distal canals were single-canaled. 2. The morphology of canal at apical 5mm area were varied, most of them were round or ovoid and 8-shaped. 8-shapes of them were long, slender or long, thick. 3. The size of mesial canal was $1.8{\pm}0.2$, $0.6{\pm}0.1mm$, but that of distal canal was $1.0{\pm}0.2$, $0.6{\pm}0.1mm$ each.