[Frequency of apical, lateral and furcational accessory canals].

Two hundred and thirty permanent roots were examined stereomicroscopically to determine the frequency of apical, lateral and furcational accessory canals. The frequency of apical accessory canals averaged 19.6% and lateral 8.3%. The furcational accessory canals were observed in 32.0% of all furcations. These findings emphasize the necessity for undertaking the meticulous disinfection and qualitative obturation of endodontic space.