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

V08N03 | 2018 | Original Article | Pages 55 to 60

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

Endodontics, root canal therapy, sodium hypochlorite, root canal irrigants

Introduction: The aim of this study was to evaluate the amount of debris and sodium hypochlorite extruded apically when three different work lengths were used to canal preparation. Methods: Thirty single-rooted teeth were used. ProTaper Universal rotary system were used for root canal preparation. The teeth were randomly divided into 3 experimental groups (n=10). G1, instrumentation 1 mm short of the major foramen; G2, instrumentation in 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: The data were analyzed using Kruskal-Wallis and Dunn tests. G1 had the lowest amount of extruded sodium hypochlorite, which was significantly different from the other groups (P<.05). Conclusion: The working length for root canal instrumentation has direct influence on the amount of sodium hypochlorite extruded apically. 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: