DOI: 10.36347/sjds.2019.v06i07.001

Pages: 326-330

The aim of this study was to compare and evaluate the canal transportation and straightening of the mesiobuccal canal of mandibular first molars prepared by ProTaper Next, OneShape and F6 SkyTaper using cone-beam computed tomography (CBCT). Sixty six mesiobuccal root canals of extracted mandibular first molars with curvatures 20- 40˚ and length 19-22mm were used. Teeth embedded in acrylic resin block were assigned to three groups and prepared using ProTaper Next, OneShape and F6 SkyTaper files. CBCT images were obtained before and after instrumentation to compare the canal transportation at 2mm, 5mm and 8mm from the root apex and also to assess the canal curvatures for straightening. The obtained results were analysed using Kruskal Wallis test to compare the mean canal transportation. One-way ANOVA test followed by Tukey's Post hoc analysis was used to compare the mean canal straightening between the groups. Results: The least canal transportation occurred with F6 SkyTaper group, followed by OneShape group and ProTaper Next group at all the levels which was statistically significant. Mean values for canal straightening among the groups were not significantly different. Conclusion: Although all the three rotary systems caused some degree of canal transportation and straightening, the single Ni-Ti rotary file F6 SkyTaper system caused significantly least canal transportation and straightening than the other file systems.