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Infect Immun. 1978 March; 19(3): 846-853
Copyright © 1978 American Society for Microbiology. All Rights Reserved.

Comparative Estimates of Bacterial Affinities and Adsorption Sites on Hydroxyapatite Surfaces

W. B. Clark1,2, L. L. Bammann1 and R. J. Gibbons1,2

1 Forsyth Dental Center, Boston, Massachusetts 02115
2 Harvard School of Dental Medicine, Boston, Massachusetts 02115

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 Ca2+ 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 components presented fewer adsorption sites. Substantially higher numbers of cells of strains of S. sanguis, S. mitis, and A. viscosus adsorbed to saliva-treated HA because the film of adsorbed salivary components increased the number of adsorption sites for these strains. The affinity constants for all but one strain studied were lower on saliva-treated HA than on untreated HA. The number of bacterial cells which adsorbed to saliva-treated HA more closely related to the number of available binding sites than to the strength of their adsorption bonds when tested at an initial concentration of 2 x 107 organisms/ml. Although some differences were observed in the adsorption of strains of S. mutans representative of five serological groups, the numbers which attached to saliva-treated HA did not vary widely; this suggests that factors other than their ability to attach to a pellicle-covered HA surface may be responsible for their varying geographic distribution in human populations.

Infect Immun. 1978 March; 19(3): 846-853
Copyright © 1978 American Society for Microbiology. All Rights Reserved.



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