通过对３７例牙髓炎患者髓腔细菌学检查，结果显示绝大多数为需氧菌和厌氧菌混合感染。共分离出９个厌氧菌属，３２个菌种，１０３株厌氧细菌，位居前三位的菌属为消化链球菌、拟杆菌、放线菌，平均每例检出３．０３株厌氧细菌。 Bacterial examination of the medullary cavity of 37 patients with pulpitis showed that the vast majority were mixed infections of aerobic and anaerobic bacteria. A total of 9 anaerobic bacteria, 32 bacteria and 103 anaerobic bacteria were isolated. The top three bacteria were Streptococcus digestinum, Bacteroidetes and Actinomycetes, with an average of 3.03 Anaerobic bacteria.