RESUMO:A atividade antimicrobiana do extrato da casca do caule de Anacardium occidentale L., foi avaliada em três culturas de bactérias isoladas de biofi lme dental. A atividade antimicrobiana foi conduzida em placa de Petri pelo método de difusão para determinação da Concentração Inibitória Mínima (CIM) e Concentração Inibitória Mínima de Aderência (CIMA). Inibição aureolar (CIM) foi observada com concentrações de 12,5 mg/mL em S. mutans e 6,25mg/mL em S. mitis e S. sanguis. Os resultados sugerem que o extrato tem efeito na CIMA em concentrações de 0,31 mg/ mL em S. mutans e S. mitis e de 0,15 mg/mL em S. sanguis e pode ser usado terapeuticamente na odontologia como agente antibacteriano.Unitermos: Anacardium occidentale, atividade antimicrobiana, biofi lme dental.ABSTRACT: "In vitro antimicrobial activity of an extract of Anacardium occidentale L. against Streptococcus species". The antimicrobial activity of the extract of the stem bark of Anacardium occidentale L., was evaluated in three cultures of bacteria of the dental plate. The antimicrobial activity was assayed in Petri dishes using the diffusion method for determination of the minimal inhibitory concentration (MIC) and minimal inhibitory concentration of adherence (MICA). Aureolar inhibition (MIC) was observed with concentrations of 12.5 mg/mL in S. mutans and 6.25 mg/mL in S. mitis and S. sanguis. The results suggest that the extract has effect in the MICA in concentrations of 0.31 mg/mL in S. mutans and S. mitis and of 0.15 mg/mL in S. sanguis and therapeuticly can be used in the dentistry as an antibacterial agent.
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