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In vitro Demineralization by Strains of Actinomyces viscosus and Streptococcus sobrinus of Sound and Demineralized Root Surfaces

Departments of Restorative Dentistry

F.F. Feagin

Physiology and Biophysics, University of Alabama at Birmingham, University Station, Birmingham, Alabama 35294

T.J. Heaven

Community and Public Health Dentistry

J. Sheetz

Department of Biology, Birmingham Southern College, Birmingham, Alabama 35254

F. Denys

Oral Biology, School of Dentistry

Root sections were inoculated with one of two strains of Actinomyces viscosus or a strain of Streptococcus sobrinus and then incubated for 9 days in Trypticase soy broth (TSB) containing 0.25% glucose or TSB supplemented with 0.25% sucrose (TSB + S). Lesion progression was measured from microradiographs. One section from each group was examined with a transmission electron microscope. Lesion progression was associated with a fall in the pH of the medium. However, lesion progression was not correlated with the mean 48-hour pH of the medium. In both TSB and TSB + S, lesion progression withA. viscosus was significantly greater than in the S. sobrinus group. However, the mean 48-hour pH value in TSB + S was lower than that in the S. sobrinus group. Plaque formation in TSB was, subjectively, least in the S. sobrinus group. Examination of transmission electron micrographs revealed bacteria penetrating the surfaces of the sections and extending into the lesion in the A. viscosus groups but not in the S. sobrinus group. This in vitro bacterial plaque model of root caries may be suitable for investigations of the bacterial etiology of root-surface caries and the virulence factors associated with pathogenicity.

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Journal of Dental Research, Vol. 72, No. 8, 1180-1183 (1993)
DOI: 10.1177/00220345930720080301


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