CARINA ANDREEA DEVLEMINCK, MONA IONAS, CODRUTA SAROSI, LAURA STEF ASSESSMENT OF CLEANING EFFECT OF IRRIGATION TIME USING 5.25% SODIUM HYPOCHLORITE AND ASPIRATION WITH ENDOVAC The aim of this study is to determine whether there is a link between the 5.25% sodium hypochlorite irrigation time using Endovac and the endodontic space cleaning quality. The study was done on teeth with a root length of more than 12 mm that did not undergo previous endodontic treatments and had a closed apex. All roots where mechanically prepared and the irrigation protocol was applied acording to the established protocol. The root canal surface was explored by electronic microscopy. A score was given to each image regarding remaining debris and smear layer. The comparative analysis of experimental data shows, that there are no statistically significant differences between the study groups regarding debris and smear layer removal. None of the techniques used in the present study has led to the complete removal of dentinal detritus and root smear layer.