Analysis of the influence of different kinematic instrumentation in extrusion of apical debris

Endodontic instrumentation systems can cause extrusion of debris. Apical extrusion has been reported as the main cause of pain after completion of endodontic treatment. The purpose of this study was to compare canal preparation time and apical extrusion of debris during instrumentation with the ProTaper Next (PTN), WaveOne Gold (WOG), and Reciproc Blue (RCB) systems. Forty-five roots of extracted mandibular first molars, with curved mesiobuccal canals (10–20°) and independent foramina, were distributed across 3 experimental groups (n=15 each) according to the instrumentation system used. Roots were secured in Eppendorf tubes, the canals were irrigated with double-distilled water, and the instrumentation time was recorded. After instrumentation, the roots were removed from the device and the amount of extruded debris was calculated by subtracting the initial weight from the final weight. Descriptive analyses were performed, followed by the Kruskal–Wallis test with a post-hoc Dunn's test. The PTN system was associated with significantly (p <0.05) greater amounts of extruded debris and longer instrumentation time. There was no significant difference between the WOG and RCB groups (p> 0.05) between the amount of debris extruded and instrumentation time. Conclusion: The RCB and WOG were associated with less debris extrusion and shorter instrumentation time when compared to the PTN system.