“…Naitoh et al(14), Yeşiltepe et al(17), Yalçın and Akyol(8) categorizations allow comparison with each other and with the TCC definition in our study. The TCC frequency we found is less than the TCC frequency observed in Yeşiltepe et al(17) in study, and is higher than the frequency in the studies of Han et al(7), Naitoh et al(14), Yalçın and Akyol(8). As Han et al(7), Yalçın and Akyol (8) found the frequency of TCC to be higher in men, as in our study, Naitoh et al(14) and Ye-Type 4 canal comply with the TCC definition of this study.…”