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Journal of Dental Research
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Association of Caries Activity with the Composition of Dental Plaque Fluid

X.J. Gao

Peking University, School of Stomatology, Weigongcun, Haidian, Beijing, 100081, People's Republic of China

Y. Fan

The Forsyth Institute, 140 The Fenway, Boston, MA 02115

R.L. Kent, JR

The Forsyth Institute, 140 The Fenway, Boston, MA 02115

J. Van Houte

The Forsyth Institute, 140 The Fenway, Boston, MA 02115

H.C. Margolis

The Forsyth Institute, 140 The Fenway, Boston, MA 02115, hmargolis{at}forsyth.org

This study tests the hypothesis that caries activity is associated with lower degrees of saturation with respect to enamel mineral in dental plaque fluid following sucrose exposure. Plaque fluids were obtained from caries-free, caries-positive, and caries-active subjects. Samples were collected before and at 3 and 7 min after a sucrose rinse on consecutive weeks and analyzed for organic acids, inorganic ions, pH, calcium activity, and, in selected samples, total protein. After sucrose, pH values were significantly lower in the caries-active group in comparison with the caries-free and caries-positive groups. Total and free calcium concentrations increased with decreasing pH, with free calcium being about one-third of total calcium. The caries-active group exhibited significantly lower degrees of saturation with respect to enamel mineral, after sucrose, and had significantly higher mutans streptococci levels in plaque than did the caries-free samples. Thus, saturation levels in post-sucrose plaque fluids reflect the cariogenic potential of dental plaque.

Key Words: dental plaque fluid • dental caries • enamel demineralization.

Journal of Dental Research, Vol. 80, No. 9, 1834-1839 (2001)
DOI: 10.1177/00220345010800091201
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