Comparison in amount of sodium hypochlorite extrusion during irrigation with needle-syringe and EndoActivator: in vitro study

TL;DRAbstract

Objective To assess the volume of sodium hypochlorite (NaOCl) that was apically extruded from teeth prepared to different apical sizes during irrigation using an EndoActivator compared with using a needle and a syringe. Materials and methods One hundred single root canals were instrumented and randomly divided into three experimental groups (n = 30) with final apical sizes of #35, #50, or #80. Each tooth was fixed in an agarose gel model and irrigated with 2.5% NaOCl using a needle and a syringe irrigating technique. The tooth was removed, cleaned, dried and re-fixed in a new agarose gel model prior to irrigating with an EndoActivator. Apical extrusion was assessed by the weight difference before and after each irrigation and confirmed by the color change of a pH-indicator in the gel model. Data were analysed by Kruskal-Wallis test and the Mann-Whiney rank sum test for pairwise comparisons. Results There was no color or weight change in the size #35 group. Apical extrusion of NaOCl occ

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