Farahi, F., Saberi, E. and Bijari, S. 2022. Residual dentin thickness at the apical third of mandibular first molar mesial root instrumented by nickel-titanium rotary and manual files with different tapers . Giornale Italiano di Endodonzia. 36, 1 (Mar. 2022). DOI:https://doi.org/10.32067/GIE.2021.35.02.45.