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Association of the Microbial Flora of Dental Plaque and Saliva with Human Root-surface Caries

Department of Oral Microbiology, Forsyth Dental Center, 140 The Fenway, Boston, Massachusetts 02115

H.V. Jordan

Department of Oral Microbiology, Forsyth Dental Center, 140 The Fenway, Boston, Massachusetts 02115

R. Laraway

Department of Oral Microbiology, Forsyth Dental Center, 140 The Fenway, Boston, Massachusetts 02115

R. Kent

Department of Clinical Trials and Human Experimentation, Forsyth Dental Center, 140 The Fenway, Boston, Massachusetts 02115

P.M. Soparkar

Department of Clinical Trials and Human Experimentation, Forsyth Dental Center, 140 The Fenway, Boston, Massachusetts 02115

P.F. Depaola

Department of Clinical Trials and Human Experimentation, Forsyth Dental Center, 140 The Fenway, Boston, Massachusetts 02115

Dental plaque was obtained from one or two sound root surfaces of subjects with different degrees of root-surface caries experience. From subjects with root-surface caries, plaque samples were also obtained from either one incipient or one more advanced lesion. Proportions of the total flora were determined for total streptococci and different streptococcal species, total and different Actinomyces species, and lactobacilli. A sample of saliva was obtained from about one-third of the subjects for determination of the concentrations of mutans streptococci and lactobacilli. The main observations were: (1) Subjects without root-surface caries or restorations (group I), as compared with subjects with root-surface caries with or without restorations (group II), were characterized by having a lower prevalence and proportion of mutans streptococci and a higher prevalence and proportion of A. naeslundii in plaque on sound root surfaces; (2) subjects in group I also tended to have a lower salivary concentration of mutans streptococci and lactobacilli than subjects in group II; (3) dental plaque on sound surfaces in group II subjects contained a lower proportion of mutans streptococci than plaque associated with incipient or advanced lesions; and (4) the prevalence and proportion of lactobacilli in plaque associated with sound as well as carious root surfaces were very low. The data reinforce findings from other studies and indicate that, as for coronal caries, the plaque and saliva populations of mutans streptococci specifically are correlated positively with the presence of root-surface caries.

Journal of Dental Research, Vol. 69, No. 8, 1463-1468 (1990)
DOI: 10.1177/00220345900690080301


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