歯根嚢胞の細菌学的研究

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  • Bacteriological study of radicular cyst.

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This paper examined bacteriological study of 69 contents, which were classified based upon property of asymptomatic and few-symptomatic radicular cysts. Bacteria were isolated from 100% of 14 purulent cases (Group I), but only from 14. 5% of 55 serous cases (Group II). From Group I, anaerobes, especially Gram-negative rods such as Fusobacterium necrophorum were predominantly isolated, as facultative viridans type streptococci from positive culture cases of Group I, MIC values of the anaerobic isolates against various antibiotics were higher than those of bacteria indigenous to oral cavity. Many isolates from contents of radicular cyst showed various enzymatic activities thought to be toxic to periodontal tissue. In Group I and positive culture cases of Group II, scanning electron microscopic study revealed bacterial mass clumping in both the upper part of root apex and the area of apical foramen, but not in the area of apical foramen in negative culture cases of Group II. These results suggested that anaerobic isolates from contents of radicular cyst had ability to remain after antibiotic administration and to assist growth of radicular cyst. Anaerobic bacteria persisting in the upper part of root apex might proliferate and extend to contents of radicular cyst through apical foramen when host defence mechanisms decreased.

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