Pereira, K. F. S.; Junqueira-Verardo , L. B. . .; Zafalon , E. J.; Tomazinho , L. F. . .; Nascimento , V. R. do . .; Bastos , H. J. S.; Otani, A. Y. . Comparing the Efficiency of Single Versus Dual Ultrasonic Devices for Metallic Post Removal in Endodontic Retreatment: A Clinical Study. Iran Endod J 2024, 19, 189-192.