OBJECTIVE: To provide a basis for therapy and prevention, the flora of infected root canals of human deciduous teeth was analyzed.METHODS: By immediate-enzyme method, the bacteria compositions of 22 cases with infected root canals of deciduous teeth, including 8 cases with acute periapical inflammation and 14 with chronic ones, were examined. RESULTS: Among 240 strains bactera, 200 strains were obligate anaerobes, belonging to the genera peptostreptococcus, bacteriodes, veillonella, eubacterrum, propionibacterium, actinomyces and fusobacterium. Bacteriodes and eusobacterium especially B. gingivalis and F. nucleatum have been more frequently isolated from root canals with acute periapical inflammation than that with chronic ones (P<0.05). In chronic cases, veillonella especially V. parvula, were more frequently isolated than acute inflammation. CONCLUSION: Periaplcal inflammation of deciduous teeth was mixed polymicrobial infections regardless of acute or chronic cases and anaerobic bacteria were dominated. B. gingivalis and F. nucleatum probably were related to acute periapical inflammation of deciduous teeth. The effect of V. parvula on chronic periapical innammation of deciduous teeth should not be neglected.
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