Laaya S, Khojastehpour L, Layeghnejad AH, Layeghnejad AH. A Comparative Study on Rotary Mtwo Versus Passive Step Back of Hand K-File in Preparation of Extracted Curved Root Canals. Iran Endod J [Internet]. 2008 Nov. 2 [cited 2026 Jul. 8];3(2):24-8. Available from: https://journals.sbmu.ac.ir/iej/article/view/404