Effect of ethanol extract and infusion of Aloysia triphylla and Matricaria chamonilla on strains of Prevotella intermedia

Objective: to evaluate the inhibitory in vitro effect of the ethanolic extract and infusion of Aloysia triphylla vs Matricaria chamonilla on the strains of Prevotella Intermedia. Methods: Bacterial susceptibility tests were performed on strains of Prevotella intermedia with disks embedded with ethanolic extracts and infusions of Aloysia triphylla and Matricaria chamonilla at the concentrations of 25%, 50%, 75% and 100% respectively, chlorhexidine was used as a positive control to 0.12% and as a negative control the distilled water, evaluating the inhibition zones at 24 h and 48 hours. Results: the best inhibitory effect occurs with the treatment of 100% ethanolic extract of Matricaria chamonilla at 24 hours, with an inhibitory halo of 12.53 mm in relation to the treatment with 100% ethanolic Aloysia triphylla extract at 24 hours, whose inhibitory halo was 11.48 mm. The smallest effect of the inhibition halo was obtained with the 25% Aloysia triphylla infusion treatment at 48 hours with 6.24 mm. Conclusions: all treatments have an inhibitory in vitro effect on Prevotella intermedia, and at a higher concentration of the treatment, greater effectiveness. Likewise, treatments with ethanolic extract and Matricaria chamonilla infusion have a greater inhibitory effect in relation to the corresponding treatments of Aloysia triphylla both at 24 and 48 hours. And finally, the inhibitory effect of all treatments diminishes after 48 hours.