Apical Extrusion Potential of Two Nickel-Titanium Retreatment Systems

Abstract

The aim of the study was to quantify the amount of apically extruded debris during root canal filling removal with D-Race and Mtwo retreatment systems. Twenty-four extracted single-rooted mandibular incisors with straight oval-shaped root canals were instrumented with XP-Endo Shaper files and filled with gutta-percha and AH Plus sealer using vertical compaction technique. All filled samples were temporarily sealed with Citodur Hard and stored in distilled water for 30 days. The specimens were randomly divided into two groups, according to the nickel-titanium system used for root canal filling removal (n=12). The retreatment procedure was performed with Mtwo Retreatment and D-Race Retreatment. The extruded debris during retreatment procedures, was collected in preweighted Eppendorf tubes. The actual weight of extruded debris was calculated by subtracting the initial weight from the final weight of the Eppendorf tubes. Statistical analysis was performed using IBM SPSS Statistics 23.0 software. The level of significance was set at P<0.05. The investigation results did not find statistically significant differences between the experimental groups. It could be concluded that retreatment with both Mtwo and D-Race cause apical extrusion of debris material with no statistically significant difference between the amounts produced by the two tested systems.