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

Abstract

Background: Cleaning and shaping of root canals are essential steps for the success of endodontic
therapy. This study compared two types of rotary files in oval‑shaped root canals: XP‑endo
shaper (FKG, La Chaux‑de‑ Fonds, Switzerland) and Mtwo (VDW, Germany, Munich) with regard
to cleaning ability and canal preparation. Mtwo is a system of nickel–titanium files with S‑shaped
cross‑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 extracted
contralateral mandibular premolars with a single oval‑shaped canal that were selected and divided
into 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 histologic
evaluation of canal wall planning and the presence of debris. Sections were evaluated by using
AutoCAD 2017 software. Statistical analysis was used to compare between both the groups
using repeated measures multivariate analysis of variance with Bonferroni correction for post hoc
comparison 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 with
debris in XP‑endo shaper group were smaller (respectively P = 0.013 and P = 0.011). Despite the
percentage difference between groups, there was not a statistically significant difference in other
sections.
Conclusion: Statistically in the middle section of the oval‑shaped canals, the XP‑endo shaper
performs better than the Mtwo rotary files.
Key Words: Endodontics, histology, nickel–titanium alloy, root canal preparation