Albarzanji, H.A.M. and Muhamed Jamil, A.M.S. 2020. The variation in the number of roots and canals morphology of permanent mandibular first molar teeth by using cone beam computed tomography imaging in a sample of Erbil city. Erbil Dental Journal (EDJ). 3, 1 (Jun. 2020), 33–39. DOI:https://doi.org/10.15218/edj.2020.05.