| The role of bacteria in the caries process: ecological perspectives. | |
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MedLine Citation:
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PMID: 20924061 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Dental biofilms produce acids from carbohydrates that result in caries. According to the extended caries ecological hypothesis, the caries process consists of 3 reversible stages. The microflora on clinically sound enamel surfaces contains mainly non-mutans streptococci and Actinomyces, in which acidification is mild and infrequent. This is compatible with equilibrium of the demineralization/remineralization balance or shifts the mineral balance toward net mineral gain (dynamic stability stage). When sugar is supplied frequently, acidification becomes moderate and frequent. This may enhance the acidogenicity and acidurance of the non-mutans bacteria adaptively. In addition, more aciduric strains, such as 'low-pH' non-mutans streptococci, may increase selectively. These microbial acid-induced adaptation and selection processes may, over time, shift the demineralization/remineralization balance toward net mineral loss, leading to initiation/progression of dental caries (acidogenic stage). Under severe and prolonged acidic conditions, more aciduric bacteria become dominant through acid-induced selection by temporary acid-impairment and acid-inhibition of growth (aciduric stage). At this stage, mutans streptococci and lactobacilli as well as aciduric strains of non-mutans streptococci, Actinomyces, bifidobacteria, and yeasts may become dominant. Many acidogenic and aciduric bacteria are involved in caries. Environmental acidification is the main determinant of the phenotypic and genotypic changes that occur in the microflora during caries. |
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Authors:
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N Takahashi; B Nyvad |
Publication Detail:
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Type: Journal Article Date: 2010-10-05 |
Journal Detail:
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Title: Journal of dental research Volume: 90 ISSN: 1544-0591 ISO Abbreviation: J. Dent. Res. Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-02-07 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0354343 Medline TA: J Dent Res Country: United States |
Other Details:
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Languages: eng Pagination: 294-303 Citation Subset: D; IM |
Affiliation:
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Division of Oral Ecology and Biochemistry, Department of Oral Biology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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