Comparison of the cleaning efficacy of XP‑endo shaper and Mtwo rotary files in oval‑shaped canals

Background: Cleaning and shaping of root canals are essential steps for the success of endodontictherapy. This study compared two types of rotary files in oval‑shaped root canals: XP‑endoshaper (FKG, La Chaux‑de‑ Fonds, Switzerland) and Mtwo (VDW, Germany, Munich) with regardto cleaning ability and canal preparation. Mtwo is a system of nickel–titanium files with S‑shapedcross‑sectional design and XP‑endo shaper can change its shape according to the temperature.Materials and Methods: This in vitro study was performed on 16 pairs of freshly extractedcontralateral mandibular premolars with a single oval‑shaped canal that were selected and dividedinto two groups according to the root canal instrumentation technique: XP‑endo shaper and Mtwo.Then, each root cut into three coronal, middle and apical sections and processed for histologicevaluation of canal wall planning and the presence of debris. Sections were evaluated by usingAutoCAD 2017 software. Statistical analysis was used to compare between both the groupsusing repeated measures multivariate analysis of variance with Bonferroni correction for post hoccomparison and independent sample t‑tests. The level of statistical significance was set at P 0.05.Results: With a statistically significant difference in the middle third, untouched area and area withdebris in XP‑endo shaper group were smaller (respectively P = 0.013 and P = 0.011). Despite thepercentage difference between groups, there was not a statistically significant difference in othersections.Conclusion: Statistically in the middle section of the oval‑shaped canals, the XP‑endo shaperperforms better than the Mtwo rotary files.