乳牙感染根管的菌丛分析

目的分析乳牙根尖周炎感染根管菌丛，为进一步防治提供依据。方法用直接酶法对８例乳牙急性根尖周炎、１４例乳牙慢性根尖周炎感染根管菌丛成分进行分析。结果共检出２４０株细菌，厌氧菌２００株，主要分布于消化链球菌、类杆菌、韦永氏菌、真细菌、丙酸杆菌、放线菌和梭杆菌。急性炎症组类杆菌、梭杆菌的检出率明显高于慢性组（Ｐ＜００５），主要差异在牙龈类杆菌和具核梭杆菌；慢性炎症组小韦永氏菌的检出率明显高于急性组（Ｐ＜０．０５）。结论乳牙急、慢性根尖周炎感染根管内是以厌氧菌为优势菌的混合感染。牙龈类杆菌、具核梭杆菌可能与乳牙根尖周炎的急性症状有关。小韦永氏菌在乳牙慢性根尖周炎中的作用不容忽视

A bacteriology analysis from infected root canals of human deciduous teeth

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.