[The correlation of black-pigmented bacteroides spp to symptoms associated with apical periodontitis].
The quantitative analysis of the incidence of black-pigmented Bacteroides (B.P.B.) spp. in 80 human dental root canal infections (56 with acute symptoms and 24 clinically asymptomatic) in 79 adults were studied. Altogether 101 strains including 7 species of B. P. B. were identified. It was found that the infection rate of B. P. B. in symptomatic group (192.86%) was higher than that in asymptomatic group (41.67%). The means of quantity of cultivable B. P. B. (CFU/ml) and percentage of B.P.B. (CFU/ml) in total CFU/ml of bacteria were not significant. But the percentage of asacchrolytic B.P.B. species in B.P.B. positive samples in symptomatic group (73.08%) was higher than that in B.P.B. positive samples in asymptomatic group (40%). These results suggest that there is a close correlation between symptoms and the asacchrolytic species of B. endodontalis and B. gingivalis.
Beijing Hospital of Stomatology.
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Chen
D000293:Adolescent; D000328:Adult; D000368:Aged; D001442:Bacteroides Infections; D003786:Dental Pulp Cavity / Q000382:microbiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010485:Periapical Periodontitis / Q000382:microbiology*; D001443:Prevotella melaninogenica / Q000145:classification / Q000302:isolation & purification*