Introduction: The aim of this study was to determine the antimicrobial activity of mixed alkaline tetrasodium EDTA (EDTANa)/sodium hypochlorite (NaOCl) solutions with and without the addition of cetrimide (CTR) against Enterococcus faecalis biofilms.
Methods: The antimicrobial solutions were evaluated on a 3-week biofilm of E. faecalis grown on radicular dentin blocks. The irrigating solutions were 2.5% NaOCl group, 20% EDTANa group, 10% EDTANa group, 2.5% NaOCl/10% EDTANa group, 2.5% NaOCl/5% EDTANa group, 2.5% NaOCl/10% EDTANa/0.2% CTR group, 2.5% NaOCl/5% EDTANa/0.2% CTR group, and 0.9% saline solution group. Cell viability was determined by adenosine triphosphate assay, and culture techniques were used to determine colony-forming unit (CFU) counts. In groups with positive growth, the Pearson linear correlation coefficient r (-1 ≤ r ≤ 1) between relative light units (RLUs) and log (CFUs + 1) was calculated. The results of the bioluminescence adenosine triphosphate assay and CFUs of the groups were analyzed by means of analysis of variance and the Duncan test.
Results: There was Pearson correlation between RLUs and log (CFUs + 1). A similar reduction of RLUs in all NaOCl groups was seen, giving statistical differences with respect to the control. In the NaOCl groups there was no bacterial growth. The lowest antimicrobial efficacy was found for the EDTANa groups.
Conclusions: Mixed alkaline EDTANa/NaOCl solutions with and without the addition of CTR do not interfere with the antimicrobial activity of NaOCl.
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