Comparative estimates of bacterial affinities and adsorption sites on hydroxyapatite surfaces.

Infection and Immunity
W B ClarkR J Gibbons

Abstract

The adsorption of strains of prominent oral bacteria to hydroxyapatite (HA) surfaces was studied by use of an adsorption model based on the Langmuir adsorption isotherm; this permitted comparative estimates of the number of adsorption sites and the strength of the adsorption bonds on untreated and salivatreated HA surfaces for strain of Streptococcus mutans, S. salivarius, S. sanguis, S. mitis, Actinomyces viscosus, and A. naeslundii. The experimental data closely followed the adsorption model as judged by the high correlation coefficients obtained for all strains studied. Adsorption to untreated HA was similar for strains of the six species studied, suggesting that a common adsorption mechanism, possibly Ca(2+) bridging, may exist for attachment to HA. More complex interactions appeared to be involved in bacterial adsorption to saliva-treated HA since adsorption of the strains tested at unsaturating cell concentrations varied more than 30-fold. This indicates that adsorbed salivary components on HA surfaces impart a higher order of specificity for subsequent bacterial adsorption. Fewer cells of strains of S. mutans, S. salivarius, and A. naeslundii adsorbed to saliva-treated HA than to untreated HA because adsorbed salivary co...Continue Reading

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