Mahmoud, D.H. and .F, S.R. 2020. Effect of different instrument systems on the quality of bio-ceramic obturation material: (An in vitro leakage and SEM Study). Erbil Dental Journal (EDJ). 3, 1 (Jun. 2020), 1–9. DOI:https://doi.org/10.15218/edj.2020.01.