Resumo

LUCENA, Perla Hermida; BIONDI, Luciana  e  DE TORRES, Ramón. Hydrophobicity test in mutans Streptococci. Acta odontol. latinoam. [online]. 2010, vol.23, n.3, pp.210-215. ISSN 1852-4834.

Kinetic hydrophobic measurements were performed by confronting 40 mutans streptococci from thirty 10- to 20-year-old patients with 200 ml hexadecane (Sigma). Fourteen patients had high dental caries risk (Group A), dmft + DMFT >5 with 3 or more active caries, and 16 had low dental caries risk (Group B), dmft + DMFT <3 without active caries. Twenty bacteria from Group A and 20 bacteria from Group B were typed using De La Higuera’s procedure and confirmed by API strip (bio- Merieux). From the 14 patients in Group A we obtained 12 S. mutans (8 hydrophobic/ 4 non-hydrophobic), 5 S. sobrinus (4 hydrophobic/ 1 non-hydrophobic) and 3 S. rattus (hydrophobic). From the 16 patients in Group B we obtained 11 Streptococcus mutans (10 non-hydrophobic/ 1 hydrophobic), 7 Streptococcus sobrinus (6 non-hydrophobic/ 1 hydrophobic) and 2 Streptococcus rattus (hydrophobic). Patients with high dental caries risk have a higher prevalence of hydrophobic bacteria than patients with low dental caries risk (p=0.0003). All typed S. rattus were hydrophobic.

Palavras-chave : Hydrophobicity; Streptococcus mutans; Dental caries; N-hexadecane.

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