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Purpose: Calcium hydroxide is not fully effective against Enterococcus faecalis (E. faecalis), a facultative anaerobic bacterium proven to be resistant to most conventional disinfection processes. The aim of this in vitro study was to evaluate the effect of calcium hydroxide, omeprazole and the association of these substances against Enterococcus faecalis, as well as to evaluate if the acidcatalysation of the omeprazole had any influence in the results. Methods: The Minimum Inhibitory Concentration (MIC) of these drugs against E. faecalis (ATCC 29212) was determined using macrodilution test adapted from the CLSI (Clinical Laboratory and Standards Institute). Solutions with different concentrations of calcium hydroxide, associated or not to omeprazole, were tested. Data were statistically analyzed using ANOVA test with Tukey post-hoc, with a level of significance of 5%. Results: The MIC to calcium hydroxide was 32 mg mL-1 and, when associated with omeprazole, this was reduced reduced to 16 mg mL-1. The omeprazole and acidified omeprazole had similar activity.  Conclusions: Omeprazole potentiated the effect of calcium hydroxide, since the association of these drugs reduced the MIC for E. faecalis. The acidification of omeprazole, when associated with calcium hydroxide in different concentrations, did not influence its effect.

Potencialização da ação do hidróxido de cálcio sobre o Enterococcus faecalis pelo inibidor da bomba de prótons omeprazol