Laaya, Safi, Leila Khojastehpour, Abdol Hosein Layeghnejad, and Abdol Hosein Layeghnejad. “A Comparative Study on Rotary Mtwo Versus Passive Step Back of Hand K-File in Preparation of Extracted Curved Root Canals”. Iranian Endodontic Journal 3, no. 2 (November 2, 2008): 24–28. Accessed July 8, 2026. https://journals.sbmu.ac.ir/iej/article/view/404.