DOI: 10.36347/sjds.2019.v06i04.007

Pages: 244-247

Aim: To evaluate the effectiveness of 5.25% sodium hypochlorite associated with 17% Ethylenediaminetetraacetic acid (NaOCl-EDTA), with that of 1% peracetic acid (PA), in removing the smear layer. Methods and Materials: Seventy five extracted mandibular premolars extracted due to orthodontic reasons were divided into three groups (NaOCl+EDTA, PA and saline). The teeth were instrumented using hand files and the ProTaper Next system for a standardized time of 7 min. A total of 20 mL of NaOCl followed by 5 mL of EDTA were applied during instrumentation in the NaOCl-EDTA group, whereas 20 mL of PA in the PA groups and 20 ml of normal saline in control group, respectively. An additional 5 mL of saline was applied in all the groups to neutralize the environment. A scoring system was used to conduct the SEM assessment. The results were submitted to the Kruskal-Wallis test, complemented by Dunn's test (SEM analysis) (P<0.05). Results: In the PA group, the presence of a smear layer in the apical third was significantly greater than in the cervical third (P<0.05); no significant differences were observed between the middle and cervical thirds, or between the middle and apical thirds (P>0.05). Conclusion: This study showed that there was no significant difference between PA and NaOCl-EDTA irrigation regimens regarding removal of the smear layer, except for greater removal in the middle third by the NaOCl-EDTA group.