Objective: Evaluating the neutralization of sodium hypochlorite (NaOCl) by sodium thiosulfate in vitro, in different concentrations, in the prevention of para-chloroaniline (PCA) formation when in contact with CHX. Material and methods: It were collected 2 mL of NaOCl solution to 2.5% and to 6%, divided in eight groups according to the sodium thiosulfate concentration (1.0; 2.5; 5.0; 10%) (TSF). The tests were done in duplicate and in each plate, it was poured 2mL of TFS and the reaction was observed for 5 minutes. After, 2 mL of 2% Chlorhexidine (CHX) were pouring on the plates to verify the formation of PCA. The infrared spectroscopy with Fourier transform was used to verify the presence of PCA, and, in each solution, the pH was verified with universal strip. Results: All analyzed samples presented presence of water and deuterium water, and there was not identification of the PCA presence. The pH result of the solutions was between 8 and 9. It was verified that in the increasing of the concentration of the TFS there was gradual formation of precipitated compound and increase of the turbidity of the final sample. Conclusion: TFS can be used as an intermediate irrigation solution to prevent the formation of para-chloroaniline in the combined use of NaOCl and CHX.
Microorganisms that infect the root canals system are the main etiologic factor of the periapical pathologies. Some microorganisms are resistant to the antimicrobial treatment and may survive in the root canal after the chemical mechanical preparation and intra-canal medication, characterizing a persistent infection. In cases of failure of the endodontic treatment, a new approach may be done using additional measures that involve this infectious process control through the elimination or maximum reduction of microorganisms. Therefore, this article aims to evaluate the antimicrobial potential of different formulations of intra-canal medication compared to strains of Enterococcus faecalis, Pseudomonas aeruginosa and Staphylococcus aureus in Petri plates. It was used diffusion test in agar where each Petri plate with the inoculated bacteria presented 5 wells that were filled with each medication. The diameters of the bacterial inhibition zones were measured and registered to each tested medication at the period of 24 hours, 48 hours, 1 week and 2 weeks. All the medications promoted inhibition halos; however, a higher elimination of micro-organisms can be significantly achieved through the association of different substances in the formulation of an intra-canal medication, with emphasis to HPG and Ca(OH)2 + CHX.
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