Farhad Molashahi, Narges, et al. “The Efficacy of FlexMaster’s IntroFile, PreRaCe and Gates Glidden Drills in Straight-Line Access: A CBCT Assessment”. Iranian Endodontic Journal, vol. 9, no. 3, June 2014, pp. 199-03, doi:10.22037/iej.v9i3.5057.