Comparison of retreatment times of root fillings with different sealers by different retreatment techniques

Abstract

Objectives: This study aimed to compare retreatment times of different NiTi enstrumantation systems used for removal of different root canal filling materials. Materials and Methods: Sixty single rooted human mandibular premolar teeth were used. The root canals were prepared with Mtwo NiTi rotary files and irrigated with 2 mL of 5.25% NaOCl between each file. Specimens were divided into 4 groups (n=15). The root canals were obturated with gutta-percha and root canal sealer by cold lateral compaction. Resin sealer was used in Group 1 and 2, while MTA based root canal sealer was used in Group 3 and 4. Following setting of sealers, ProTaper Retreatment set was used to remove the root canal filling in Groups 1 and 3, whereas Reciproc R25 was used to remove the root canal filling in Groups 2 and 4. Duration to reach the working length was recorded with chronometer. Data was analyzed with one-way ANOVA. Results: MTA based root canal sealer was detected to be removed faster than resin sealers. When comparing retreatment systems, ProTaper Retreatment file system reached to the working length faster than Reciproc R25 did. Conclusions: In conclusion, we report that ProTaper retreatment set is more efficient than Reciproc R25 file for removal of root canal filling, and removal of MTA based root canal sealers are easier than resin sealers.