Background: Endodontic retreatment is performed due to endodontic failures. The main purpose of retreatment is cleaning and shaping of the root canal with removal of old root filling material. Thus, the aim of our study was to compare the efficiency of protaper retreatment files and H-file during root canal retreatment. Material and methods: A sample of 30 recently extracted human mandibular premolars were collected for the study. The teeth with single root canals, completely formed apices and root curvature not exceeding 10° were selected for the study. The teeth which have cracks, open apices, root caries or root resorption were excluded from the study. The teeth stored at 37°C in 100% relative humidity for 1 month, allowing the setting of the sealer and mimicking a clinical condition. Thirty teeth were divided into 2 groups, 15 in each. Group I – Protaper retreatment files and Group II – H files .Statistical analysis was done by using SPSS, version 22 (SPSS, Inc., Chicago, IL). The level of significance applied for all tests was set at p < 0.05. Results: The results of our study shows that the filling material remnants were more in group II using H-file in comparison with Protaper retreatment files. The result of other variable that was percentage of removed material was more in Group I as compared to Group II. Conclusion: The present study concluded that ProTaper retreatment files were found to be effective in the removal of gutta‑percha from the root canal in comparison to the H-files.
Keywords: Gutta-percha, Protaper Retreatment files, H-files.
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