3D Analysis of D-RaCe and Self-Adjusting File in Removing Filling Materials from Curved Root Canals Instrumented and Filled with Different Techniques

Abstract EN

The aim of this study was to compare the efficacy of D-RaCe files and a self-adjusting file (SAF) system in removing filling material from curved root canals instrumented and filled with different techniques by using microcomputed tomography (micro-CT).

The mesial roots of 20 extracted mandibular first molars were used.

Root canals (mesiobuccal and mesiolingual) were instrumented with SAF or Revo-S.

The canals were then filled with gutta-percha and AH Plus sealer using cold lateral compaction or thermoplasticized injectable techniques.

The root fillings were first removed with D-RaCe (Step 1), followed by Step 2, in which a SAF system was used to remove the residual fillings in all groups.

Micro-CT scans were used to measure the volume of residual filling after root canal filling, reinstrumentation with D-RaCe (Step 1), and reinstrumentation with SAF (Step 2).

Data were analyzed using Wilcoxon and Kruskal-Wallis tests.

There were no statistically significant differences between filling techniques in the canals instrumented with SAF (P=0.292) and Revo-S (P=0.306).

The amount of remaining filling material was similar in all groups (P=0.363); all of the instrumentation techniques left filling residue inside the canals.

However, the additional use of SAF was more effective than using D-RaCe alone.