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Journal of Dental Research
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pH Change in Artificial Dental Plaque Formed by Glucosyltransferase and Some Oral Bacteria During Batch and Continuous Culture

T. Takehara

Department of Preventive Dentistry, Kyushu Dental College, Kokurakita-ku, Kitakyushu 803, Japan

M. Itoh

Department of Preventive Dentistry, Kyushu Dental College, Kokurakita-ku, Kitakyushu 803, Japan

N. Hanada

Department of Preventive Dentistry, Kyushu Dental College, Kokurakita-ku, Kitakyushu 803, Japan

E. Saeki

Department of Preventive Dentistry, Kyushu Dental College, Kokurakita-ku, Kitakyushu 803, Japan

Streptococcus mutans alone or cell-free glucosyltrarisferase (GTase) - together with either Streptococcus sanguis, Streptococcus salivarius, Actinomyces viscosus, or Lactobacillus casei cells-formed artificial dental plaque that firmly adhered to glass electrodes in a continuous culture system containing sucrose. The pH in these artificial plaque samples decreased more than did that of the surrounding medium. In the absence of GTase, the bacteria other than S. mutans did not form firmly-adhering plaque on glass electrodes. The pH of the plaque formed with GTase alone did not show the pH decrease seen when the plaque contained bacteria, but, because it catalyzed the synthesis of glucan, it is suggested that the glucan acts as a diffusion barrier to retard acid loss from plaque containing acid-producing bacteria.

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Journal of Dental Research, Vol. 64, No. 3, 447-449 (1985)
DOI: 10.1177/00220345850640031101
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This Article
Right arrow Abstract Freely available
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Right arrow Alert me when this article is cited
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What's this?