Michelon, C.; De Carlo Bello, M.; Mastella Lang, P.; Pillar, R.; Souza Bier, C. A. Efficacy of Passive Ultrasonic Irrigation in Removing Residual Root Filling Material During Retreatment: <i>ex vivo</i> Analyses by Micro-CT and Confocal Laser Scanning Microscope. G Ital Endodon 2024, 35.