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Int Endod J. 2007 May;40(5):338-43. Epub 2007 Apr 2.

Cytotoxicity analysis of EDTA and citric acid applied on murine resident macrophages culture.

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Department of Endodontics, Dental School, University of São Paulo, São Paulo, Brazil.



To assess the ex vivo cytotoxicity of EDTA and citric acid solutions on macrophages.


The cytotoxicity of 17% EDTA and 15% citric acid was evaluated on murine macrophage cultures using MTT-Tetrazolium method [3-(4,5-dimethylthiazol-2-yl)-2,5 diphenyl tetrazolium bromide]. A total of 5 x 10(5) cells were plated in medium culture with 17% EDTA or 15% citric acid. Fresh medium was used as a control. Toxicity values were analysed statistically by anova and Tukey's test (P<0.05) at short (0, 6, 12, 24 h) and medium periods (1, 3, 5, 7 days), using ELISA absorbance.


On the short term, both EDTA (0.253 nm) and citric acid (0.260 nm) exhibited cytotoxic effects on macrophage cultures (P<0.05). On the medium term, statistical differences were observed (P<0.05) between the groups. EDTA (0.158 nm) and citric acid (0.219 nm) were cytotoxic when compared with the control group; EDTA-reduced macrophage viability significantly more than citric acid (P<0.05).


Both EDTA and citric acid had effects on macrophages cells ex vivo, but citric acid was less toxic in periods from 1 to 7 days of use.

[Indexed for MEDLINE]

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