Beyraghshamshir R, Karimian E, Sekandari S. Maxillary Premolars with Three Root Canals: A Case Report. Iran Endod J [Internet]. 2020 Oct. 1 [cited 2026 Jul. 8];15(4):259-62. Available from: https://journals.sbmu.ac.ir/iej/article/view/30636