“ Comparison of Debris Extruded Apically and Working Time Used by ProTaper Universal Rotary and ProTaper Retreatment System During Gutta-Percha Removal ”. Journal of Applied Oral Science 18, no. 6 (December 1, 2010): 542–545. Accessed July 17, 2024. https://revistas.usp.br/jaos/article/view/3842.