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Journal of Dental Research
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Colonization Resistance of Defined Bacterial Plaques to Streptococcus mutans Implantation on Teeth in a Model Mouth

C.J. Perrons

University College and Middlesex School of Dentistry, Mortimer Market, London WC1E 6JD, England

H.D. Donoghue

University College and Middlesex School of Dentistry, Mortimer Market, London WC1E 6JD, England

We investigated the ability of Streptococcus mutans C67-1 to colonize simple bacterial plaques and the effects of age and stability of the pre-formed plaque on colonization resistance. Mixed plaques of Actinomyces viscosus WVU627, 'Streptococcus mitior' LPA-1, and Veillonella dispar OMZ193 were grown on tcoth segments, mounted back to back for simulation of approximal sites in a model mouth for 66 h. S. mutans C67-1 was either included in the original inoculum or super-inoculated onto the developing plaque. Inclusion of S. mutans C67-1 did not alter the total viable counts, but the proportional composition changed due to inter-species interactions. Colonization resistance of the mixed-plaque samples developed within 24 h, although S. mutans C67-1 was always able to colonize these stagnation sites. Colonization resistance of 24-hour plaque against a fresh isolate, S. mutans CP3, was also studied. There was greater colonization resistance by the basic plaque to this organism, compared with S. mutans C67-1, although the reasons for this were not clear. These initial experiments demonstrate the way in which the factors involved in bacterial colonization resistance in microbial films on teeth can be studied under controlled conditions.

Journal of Dental Research, Vol. 69, No. 2, 483-488 (1990)
DOI: 10.1177/00220345900690021301
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