Mehrvarzfar, P. (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), pp. 290–294. doi: 10.22037/iej.v9i4.5855.