cone-beam computed tomography assessment of root canal transportation by neoniti and reciproc single-file systems

introduction: the aim of this in vitro study was to compare the canal transportation of two single-file engine-driven systems, neoniti and reciproc, using cone-beam computed tomography (cbct). methods and materials: forty-five non-calcified roots with mature apices and apical curvature of 15-30 degrees were selected from extracted human maxillary molars for this study. samples were randomly divided into two groups ( n =20) and a control group ( n =5) and canal preparation with either system was performed according to manufacturers' instructions. pre- and post-instrumentation cbct images were captured and the amount of canal transportation within the files was calculated at levels of 3, 4, and 5 mm from the apex. the independent sample t-test was used to analyze the statistical significance between the two groups. the level of significance was defined at 0.05. results: reciproc created more canal transportation compared to neoniti in both mesiodistal and buccolingual directions. the difference between the two systems was statistically significant in all evaluated distances from the apex ( p <0.001). during this study fracture of one file (25/0.08) in the neoniti group occurred. conclusion: neoniti and reciproc systems have significant difference in terms of creating canal transportation. reciproc created more canal transportation in buccolingual and mesiodistal dimensions.