Effect of endodontic irrigants on nanoleakage between resin cement and radicular dentin

 The aim of this in vitro study was to evaluate, under scanning electron microscopy, the influence of endodontic irrigants on nanoleakage between resin cement and radicular dentin; and to observe the efectiviness of sodium ascorbate on nanoleakage. Sixty human uniradicular freeshly extracted teeth were divided into 12 experimental groups( 5 especims each) according to endodontic irrigants and resin cements tested: G1- 0,9% saline solution + Panavia F (control), G2- 5,25% NaOCl + Panavia F; G3- 5,25% NaOCl + 17% EDTA + Panavia F; G4- 5,25% NaOCl + EDTA + 10% sodim ascorbate + Panavia F; G5- 17% EDTA + Panavia F; G6- 5,25% NaOCl + 10% sodium ascorbate + Panavia F; G7- 0,9% saline solution + Cement-post (control); G8- 5,25% NaOCl + Cement-post; G9- 5,25% NaOCl + 17% EDTA + Cement-post; G10- 5,25% NaOCl + 17% EDTA + 10% sodium ascorbate + Cement-post ; G11- 17% EDTA + Cement-post; G12- 5,25% NaOCl + 10% sodium ascorbate + Cement-post. The especims were imersed in silver nitrate before being processed for scanning electron microscopy. The nanoleakage test did not show different patterns between groups evaluated on the scanning electron microscope, as the infiltration occurred only on the pathways of tubules exposed to the marker.In conclusion, the auxiliary chemical substances tested, did not influence the dentin-resin cement nanoleakage; and the efectiviness of sodium ascorbate couldn’t be observed.