Antimicrobiological effect in vitro of Psidium guajava L. upon biofilm

Objective: The aim of this study was evaluate in vitro the antibacterial activity of the extract of the leaf of Psidium guajava Linn against the bacteria strains of the oral biofilm: Streptococcus mutans, Streptococcus mitis, Streptococcus sanguis, Streptococcus sobrinus e Lactobacillus casei . Material and Methods: The study was realized using laborious bacteriological techniques. The bacteria were cultivated in Brain Heart Infusion (BHI) broth (DIFCO) and incubated at 37ºC for 18 to 24 hours in microaerophilic environment. The tests were carried out by inundation technique in Petri dishes to determine the Minimum Inhibitory Concentration (MIC). Results: The extract of the Psidium guajava Linn. showed potential antibacterial activity upon bacteria strains making, in mean, inhibition halos between 11 and 20 mm. Conclusion: Despite the results founded, we concluded that the extract this plant show potentiality of inhibition of grow of bacterial of the oral biofilm. Then, the results supports what the extract can be used as a therapeutic antibacterial agent in Dentistry.