Canal transportation using Mani GPR or HyFlex NT during the retreatment of curved root canals: A micro‐computed tomographic study

This study assessed the apical transportation using Mani GPR or HyFlex NT during the retreatment of curved root canals. Thirty‐eight roots were analysed using micro‐CT for the comparison of apical transportation produced by two retreatment systems. Longitudinal transportation, horizontal transportation, variation in the canal angle of curvature and variation in the canal/root width ratio were analysed. Longitudinal transportation was frequently observed, regardless of the system used. The canals retreated with Mani GPR showed a significantly higher horizontal transportation at 1 mm from the root apex (P