Effect of solvent use on dentin crack in retreatment

AIM or PURPOSE: The aim of this study was to evaluate the effect of solvent use on dentinal crack formation in during root canal retreatment with micro-CT. MATERIALS and METHOD: Root canal treatments were performed on the mesial roots of 20 mandibular molars. The teeth were divided in two groups: Group A: solvent and Group B: Non-solvent. During primary treatment, canal preparation was performed using Revo-S files. The root canals were filled using the lateral compaction technique and AH Plus sealer. During retreatment procedure, Protaper Retreatment Files were used in both groups. Guttasolv was used as solvent during retreatment in group A. Before and after the initial treatment and retreatment, the teeth were imaged using microCT. Meanwhile, the remaining root canal filling materials in the teeth were also examined. RESULTS: Crack formation was not observed in either group. Residual filling material remained in the root canal after the procedure in both groups and there was no statistical significant difference found in terms of residual matter between the regions according to the results of the measurements made separately in three regions as coronal, middle, and apical regions. CONCLUSION(S): In conclusion, within the limitations of this in vitro study, it could be said that Ni-Ti systems do not cause dentin defects if used with or without a solvent. Even if the retreatment was performed close to ideal, it was determined that residual filling material remained on the canal walls during retreatment.