Amin, S. .; Ahmed, A. .; Awan, A. .; Awan, F. .; Sajid, K. . Comparison of Efficacy of H-File and ProTaper for Removal of Gutta-Percha from Root Canal in Non-Surgical Endodontic Retreatment: An in-Vitro Study. Biol Clin Sci Res J 2025, 6, 109-112.