| this study was carried out to investigate the effect of methanolic extract of Zingiber officinale in different concentrations in inhibition of Streptococcus mutans isolated from cases of dental caries and periodontitis to achieve this aim this study included two methods: well diffusion method with concentrations (12.5,25,50,100,150) mg/ml .The crude extract gave activity against the tested isolates by the inhibition zones (7.6,13.3,15.3,19,23) mm ,the second method was Microtiter plate 96well with concentrations(6.25,12.5,25,50,100,150).The MIC was (12.5) .The results showed that the Zingiber officinale have activity larger than the antibiotic Ampicillin 32%. |