结果：两种治疗方法的牙根吸收率差异没有显著性；但是治疗疗程差异有显著性。
Results: There's no statistically significant difference between the rate of root resorption of two methods, but there's statistically significant difference between the treatment time.
目的 分析牙周源性牙周牙髓联合病变患牙根管内口腔常见可疑致病菌的检出情况。
Objective To investigate the prevalences of common suspected pathogens in root canals from combined periodontalendodontic lesions of periodontal origin.
目的用口腔数字成像系统(ODIS)检验根管长度测量仪在测定前牙根管工作长度时的准确性及实用性。
Objective to test the accuracy of electronic apex locator in determining working length of anterior teeth using ODIS system.
目的治疗顽固性下颌磨牙根尖周炎。
Objective We treats the stubborn lower jaw rubs root of a tooth point Zhou Yan.
结果：三组病例正畸治疗前后牙根等级分布改变有显著性差异（P< 0 .0 0 1）。
Then analyze root resorption and its distribution changes among groups . Result: Root resorption occurred during orthodontic treatment in each group(P<0.001).
结果：三组病例正畸治疗前后牙根等级分布改变有显著性差异（P< 0 .0 0 1）。
Then analyze root resorption and its distribution changes among groups . Result: Root resorption occurred during orthodontic treatment in each group(P<0.001).
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