Can kinematics, file diameter, and PUI influence the intracanal decontamination and apical bacterial extrusion?

The present study investigated the intracanal decontamination and apical extrusion of bacteria debris from root canals instrumented with rotary reciprocating systems (ProDesign Logic or ProDesign R), different file diameters using conventional syringe irrigation (CSI) passive ultrasonic (PUI). Eighty extracted mandibular premolars were contaminated Enterococcus faecalis randomly assigned to eight experimental groups according canal instrumentation technique employed (n = 10): G1: Prodesign 25.06; G2: R G3 G4 same single-file systems, respectively, 35.05 CSI. G5, G6, G7, G8 like previous groups, but PUI. Apically extruded during was collected into pre-weighed microtubes. weight empty microtube subtracted final establish amount debris. Bacteria for a microbiological evaluation colony forming units (CFU/mL). For statistical analyses, Mann-Whitney Kruskal-Wallis followed by Dunn's tests used (? 0.05). All instruments caused techniques, PUI promoted greater bacterial (p < CFU/mL count indicated that equally effective in > tested (regarding diameter kinematics) associated similar amounts apically decontamination. extrusion.