R. C. T. Paiva, C. Solda, F. Vendramini, J. R. Vanni, F. Baldissarelli, and V. J. Fornari, “Regaining Apical Patency with Manual and Reciprocating Instrumentation during Retreatment”, Iran Endod J, vol. 13, no. 3, pp. 351–355, Jul. 2018.