Fig. 2From: Comparison of the canal transportation of ProTaper GOLD, WaveOne GOLD, and TruNatomy in simulated double-curved canalsSuperimposition images of pre- and post- instrumentation of each group. a ProTaper GOLD, b WaveOne GOLD, c TruNatomy, d perpendicular line drawn to the canal central axis at 1 mm intervals from apical foramen. The first measurement point was 1 mm from the apical terminus, and the last point was 9 mm from the apical terminus. M, mesial; D, distalBack to article page