Sarıçam, Esma, et al. “ProTaper Retreatment System Versus Balanced Force Technique for Apical Extrusion and Gutta-Percha Removal”. International Dental Research, vol. 9, no. 2, Aug. 2019, pp. 63-68, https://doi.org/10.5577/intdentres.2019.vol9.no2.5.