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Streptococcus mutans and Lactobacillus Detection in the Assessment of Dental Root Surface Caries Risk
R.P. Ellen
University of Toronto, Faculty of Dentistry, 124 Edward Street; Toronto, ON, Canada M5G 1G6
D.W. Banting
Division of Community Dentistry, University of Western Ontario, London, ON, Canada N6A 5C1
E.D. Fillery
University of Toronto, Faculty of Dentistry, 124 Edward Street; Toronto, ON, Canada M5G 1G6
Forty-five subjects contributing 150 root surfaces with gingival recession were sampled seven times over a 32-month period. We calculated isolation frequencies of lactobacilli on selective Rogosa SL agar and S. mutans in a sensitive enrichment broth and on mitis salivarius agar. Both S. mutans and lactobacilli were isolated more frequently from surfaces which became carious than from those remaining caries-free. Isolation frequencies were also higher for caries-free surfaces in caries-active subjects than for caries-free surfaces in caries-inactive subjects. The presence or absence of S. mutans and lactobacilli in samples taken at baseline could discriminate between subjects who were to be root-caries-active and those who were to remain root-caries-inactive during the subsequent observation period. Moreover, if both bacteria were detected or only S. mutans was detected on a root surface at its entry into the study, that surface had a greater risk for developing a root lesion. However, the tests could not predict which root surfaces within the mouths of caries-active subjects were to become carious. Analysis of the data suggests that simple microbiological detection tests may be useful in identifying patients at high risk of root caries.
Journal of Dental Research, Vol. 64, No. 10,
1245-1249 (1985)
DOI: 10.1177/00220345850640101301
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