투명표본(透明標本)에 의(依)한 하악제1대구치(下顎第1大口臼齒)의 근관형태(根管形態)에 관(關)한 연구(硏究)

A STUDY OF THE ROOT CANAL MORPHOLOGY OF HUMAN MAXILLARY FIRST MOLAR WITH TRANSPARENT SPECIMENS

One hundred human maxillary first molars were injected with china ink, decalcified, cleared, and used in vitro study to determine the number of root canals, the frequency and location of lateral canals, canals per root, and frequency of apical deltas. The results were as follows; 1. The mesiobuccal root was found to contain a single primary canal in 53% of the teeth studied and two canals in 47 % of the teeth studied. 2. In mesiobuccal roots with two canals, the seperated apical foramen appeared 32% of the specimens and the common apical foramen 15% of the specimens. 3. Of the 347 canals studied, 26.9% of the canals were found to contain lateral canals and these ramifications were mainly located in the apical third of the root.