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Original Paper

The Isolation of Actinomyces naeslundii from Sound Root Surfaces and Root Carious Lesions

Brailsford S.R.a · Lynch E.J.R.b · Beighton D.a

Author affiliations

aJoint Microbiology Research Unit, King’s College School of Medicine and Dentistry, Dental School, and bDepartment of Conservative Dentistry, St. Bartholomew’s and the Royal London Hospital Medical College, London, UK

Related Articles for ""

Caries Res 1998;32:100–106

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Published online: February 27, 1998
Issue release date: March – April

Number of Print Pages: 7
Number of Figures: 0
Number of Tables: 6

ISSN: 0008-6568 (Print)
eISSN: 1421-976X (Online)

For additional information: http://www.karger.com/CRE

Abstract

The isolation of Actinomyces naeslundii from sound, exposed root surfaces (n = 56) and soft and leathery root carious lesions (n = 71) was investigated. Root carious lesions were sampled after the removal of overlying plaque. Supragingival plaque or carious dentine was sampled using a sterile excavator, the samples were disaggregated and cultured on both selective and non-selective media. A. naeslundii isolates were identified to the genospecies using specific antisera. Significantly greater numbers and proportions of A. naeslundii genospecies 2 than A. naeslundii genospecies 1 were isolated from all sites sampled. There was no significant difference between the numbers and proportions of the two genospecies isolated from leathery and soft lesions. The relationship between the presence of A. naeslundii genospecies and aciduric and acidogenic organisms was investigated. Those sound exposed root surfaces from which A. naeslundii genospecies 1 and/or 2 were isolated yielded significantly lower numbers of lactobacilli and yeasts than the surfaces from which A. naeslundii were not isolated. This difference was also found in leathery lesions but not soft root carious lesions. The microflora of soft root carious lesions was found to comprise primarily gram-positive pleomorphic rods which formed 70±7.8% of the flora, while in plaque from exposed root surfaces and in infected dentine from leathery lesions the gram-positive pleomorphic rods represented only 35% of the flora.


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Published online: February 27, 1998
Issue release date: March – April

Number of Print Pages: 7
Number of Figures: 0
Number of Tables: 6

ISSN: 0008-6568 (Print)
eISSN: 1421-976X (Online)

For additional information: http://www.karger.com/CRE


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