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Aim: To compare efficacy of protaper Universal retreatment files with Endostar RE Re‑endo rotary file system for removal of gutta‑percha from root canal during endodontic retreatment. Materials & Methods: Forty freshly extracted human mandibular premolar were treated endodontically. The teeth specimens retreated by one of the two rotary systems after randomly distributing samples in 2 groups. Specimen teeth were sectioned in bucco‑lingually direction and images were taken under stereomicroscope and transferred to autocad Soft ware2020.
Statistical Analysis: Results were analyzed using Mann‑Whitney U test and one‑way analysis of variance test and post hoc Tukey‑HSD test (p <0.05).
Result: The mean percentage of remaining filling material was significantly higher in apical third of canal as compared to other thirds in both groups. Post hoc turkey test showed that there was significantly higher residual filling material in all thirds of canals treated with Endostar Re than Pro taper universal group.
Conclusion: Pro Taper universal retreatment instruments were effective in removing root canal filling in all thirds of canal in comparison with Endostar retreatment instruments.
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