Inhibitory Effects of Oolong Tea Extract on Caries–Inducing Properties of Mutans StreptococciMatsumoto M.a · Minami T.a · Sasaki H.a · Sobue S.a · Hamada S.b · Ooshima T.a
Departments of aPedodontics and bOral Microbiology, Faculty of Dentistry, Osaka University, Suita, Osaka, Japan Caries Res 1999;33:441–445 (DOI:10.1159/000016549)
The inhibitory effects of oolong tea extract (OTE) on the caries–inducing properties of mutans streptococci were examined in vitro. OTE reduced the rate of acid production by mutans streptococci accompanied with the retardation of growth rate of mutans streptococci, while the action by chromatographically isolated oolong tea polyphenol (OTF6) was weak. On the other hand, both oolong tea products decreased cell surface hydrophobicity of almost all the oral streptococci examined in the present study, and also induced cellular aggregation of
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