Ex vivo evaluation of four final irrigation protocols on the removal of hard-tissue debris from the mesial root canal system of mandibular first molars - Leoni, Graziela Bianchi; Versiani, Marco Aurélio; Silva-Sousa, Yara Teresinha Correa; Bruniera, João Felipe Bonatto; Pécora, Jesus Djalma; Sousa Neto, Manoel Damião de (International Endodontic Journal, 2017)