Efficacy of xylene and passive ultrasonic irrigation on remaining root filling material during retreatment of anatomically complex teeth - Cavenago, B. C.; Ordinola-Zapata, R.; Duarte, Marco Antonio Hungaro; Carpio-Perochena, A. E. del; Marciano, M. A.; Bramante, Clóvis Monteiro; Moraes, Ivaldo Gomes de (International Endodontic Journal, 2014)