Antibiofilm effect and cytotoxicity of calcium hydroxide associated with the Melaleuca alternifolia essential oil
DOI:
https://doi.org/10.7308/aodontol/2020.56.e29Keywords:
Endodontics , Enterococcus faecalis, Fibroblasts , Tea tree oil, Oils, volatileAbstract
Aim: To evaluate and compare the antimicrobial and antibiofilm effect, as well as the cytotoxicity of calcium hydroxide (CH) associated with the Melaleuca alternifolia (MA) essential oil, in different concentrations, and with propylene glycol.
Methods: The following medications composed the experimental groups: G1) CH/MA 1%; G2) CH/MA 5%; G3) CH/MA 10%; G4) CH/MA 20%; and G5) CH/PG. Saline solution and culture medium DMEM were used as a control in antimicrobial and cytotoxicity tests in human periodontal ligament fibroblasts (PDLF), respectively. The antimicrobial activity (n = 12) was evaluated by the disk-diffusion agar method. The immediate antibiofilm effect (n = 12) of the medications was evaluated for bacterial viability in 72 hours-biofilms of E. faecalis, formed on the dentin disc surface and treated for seven days with medications. After microbiological sampling of the remaining biofilm, the dentin discs were immersed in sterile culture medium and stored for another seven days, for analysis of the residual antibiofilm effect of the medications, when a new microbiological sampling was performed. PDLF viability was evaluated by MTS colorimetric assay (n = 9). The mean values of the inhibition halos, in mm, the colony forming units, and the metabolic cell activity percentage were analyzed by means of Kruskal-Wallis and post hoc Dunn (α = 5%) tests.
Results: All of the experimental medications presented higher antimicrobial and antibiofilm effects, when compared to the saline solution control (p < 0.05), and maintained the PDLF feasible, similar to the DMEM control (p > 0.05).
Conclusions: The association of the Melaleuca alternifolia essential oil, at concentrations of 1%, 5%, 10%, and 20%, with calcium hydroxide promoted an excellent antimicrobial and antibiofilm activity, and biocompatibility with fibroblasts, similarly to the association with propylene glycol.
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