Heat release, time required, and cleaning ability of Mtwo R and ProTaper universal retreatment systems in the removal of filling material - Bramante, Clóvis Monteiro; Fidelis, Natasha Siqueira; Assumpção, Tatiana Santos; Bernardineli, Norberti; Garcia, Roberto Brandão; Bramante, Alexandre Silva; Moraes, Ivaldo Gomes de (Journal of Endodontics, 2010)