近年来,大量的资料表明牙周炎症是由菌斑所引起的。国外不少学者对龈下菌斑和细菌的种类、分布以及致病性都进行了研究,发现口腔厌氧菌感染率高,患牙周脓肿者牙周袋厌氧菌感染率可高达80%～100%。由于对厌氧菌的标本采集、分离培养和鉴定技术的条件要求高,目前尚有困难,所以我们选择了 In recent years, a large number of data show that periodontal inflammation caused by plaque. Many foreign scholars on the subgingival plaque and bacterial species, distribution and pathogenicity were studied and found that oral anaerobic bacteria infection rate, periodontal abscess with periodontal anaerobic bacteria infection rate can be as high as 80% ~ 100%. Due to the collection of anaerobic bacteria specimens, isolation and culture of identification techniques require high conditions, there are still difficulties, so we have chosen