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Oral Colonization and Pathogenicity of Actinomyces israelii in Gnotobiotic RatsHarvard School of Dental Medicine, 188 Longwood Ave., and Forsyth Dental Center, 140 The Fenway, Boston, Massachusetts 02115
Harvard School of Dental Medicine, 188 Longwood Ave., and Forsyth Dental Center, 140 The Fenway, Boston, Massachusetts 02115
Harvard School of Dental Medicine, 188 Longwood Ave., and Forsyth Dental Center, 140 The Fenway, Boston, Massachusetts 02115 Reference strains of A. israelii were orally implanted in germ-free rats after multiple inoculations. Early colonization was associated with areas of interdental hair and bedding impactions. Largest populations of organisms were isolated from teeth, as compared to the tongue, cheek, or palate. Examination of molar teeth with the scanning electron microscope revealed bacterial accumulations in the occlusal fissures, but not on smooth or approximal surfaces. Extensive plaque formation after 100-150 d was accompanied by root-surface caries and bacterial invasion of the pulp. There was no evidence of bacterial penetration of the dentin underlying surface enamel.
Journal of Dental Research, Vol. 62, No. 1,
69-74 (1983) |
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