Abdo, S.B.A. et al. 2015. Sealing ability of gutta-percha/Nano HA versus Resilon/Epiphany after 20 months using an electrochemical model – an in vitro study. Brazilian Journal of Oral Sciences. 11, 3 (Oct. 2015), 387–391. DOI:https://doi.org/10.20396/bjos.v11i3.8641375.