Influence of working length on apical extrusion of debris and sodium hypochlorite

Bruna Satye Dourado Watanabe, Bruno Vila Nova de Almeida, Roberta Fonseca de Castro, Juliana Melo da Silva Brandão, Luciana Jorge Moraes Silva

Objective: The aim of this study was to evaluate the amount of debris and sodium hypochlorite extruded apically when three different working lengths were used for root canal preparation. Methods: Thirty single-rooted teeth were used. ProTaper Universal rotary system was used for root canal preparation. Teeth were randomly divided into three experimental groups (n = 10). G1: instrumentation 1-mm short the major foramen; G2: instrumentation at the limit of the apical foramen; and G3: instrumentation 1-mm beyond the foramen. All groups were irrigated with 20 ml of 1% sodium hypochlorite. The irrigant extruded through the apical foramen during canal preparation was collected in pre-weighed Eppendorf tubes. Results: Data were analyzed by Kruskal-Wallis and Dunn tests. G1 had the lowest amount of extruded sodium hypochlorite, which was significantly different from the other groups (p-value < 0.05). Conclusion: The working length for root canal instrumentation has direct influence on the amount of sodium hypochlorite extruded apically.

Keywords: Endodontics. Root canal therapy. Sodium hypochlorite. Root canal irrigants.

How to cite: Watanabe BSD, Almeida BVN, Castro RF, Brandão JMS, Silva LJM. Influence of working length on apical extrusion of debris and sodium hypochlorite. Dental Press Endod. 2018 Sept-Dec;8(3):55-60. DOI: https://doi.org/10.14436/2358-2545.8.3.055-060.oar

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