Mehrvarzfar, Payman, Anahita Poorhashemi, Fatemeh Khodaei, Behnam Bohlouli, Farzin Sarkarat, Mojdeh Kalantar Motamedi, Mohammad Karim Layegh Nejad, and Sara Zamaheni. 2014. “The Effect of Adding Fentanyl to Epinephrine-Containing Lidocaine on the Anesthesia of Maxillary Teeth With Irreversible Pulpitis: A Randomized Clinical Trial”. Iranian Endodontic Journal 9 (4):290-94. https://doi.org/10.22037/iej.v9i4.5855.