Akhlaghi, N.M. et al. 2018. Incidence of Dentinal Crack Formation Using ProTaper Universal and WaveOne Systems in Straight and Curved Root Canals. Iranian Endodontic Journal. 13, 4 (Oct. 2018), 549–553. DOI:https://doi.org/10.22037/iej.v13i4.21114.