Objective: The aim of the study was to examine the efficacy and debris extrusion of XP -Endo Finisher and XP-Endo Finisher R when used in the removal of root canal filling as supplementary files.
Methods: Sixty single-rooted mandibular premolars with single canals were selected. After root canal preparation and obturation, roots were distributed across four groups according to the method of retreatment (n=15): H files, D Race files, D Race +XP-Endo Finisher and D Race+ XP -Endo Finisher R. After retreatment completion, the debris was dried in a hot air oven and weighed. Later, the coronal, middle and apical thirds were assessed using the stereomicroscope. One-way ANOVA followed by Tukey's post hoc test was used to compare across all tested groups. The significance level was set at 0.05 (P<0.05).
Results: XP- Endo Finisher R exhibited significantly cleaner root canals than XP- Endo Finisher (41.58±10.56 and 52.68±9.94 respectively) and extruded more debris apically (16.56%±4.07 and 12.82%±3.41 respectively) (P<0.001).
Conclusion: Although none of the tested approaches rendered root canals free of filling remnants, the XP-Endo Finisher R cleaned canals significantly more than the XP-Endo Finisher and extruded more debris apically.