209 maxillary first molars were examined by modified access preparation. The second mesiobuccal canal(MB2) clinical incidence rate was 45.9%. The factors of age and retreatment distinctly affect the detection of MB2. MB2 clinical incidence rate is high in maxillary first molars and it is easily to be found in younger or first-visit patients.%选择临床209例上颌第一磨牙,采用改良髓腔入路探查并治疗近中颊根第二根管( MB2),研究其临床发现率和影响因素.结果显示209例上颌第一磨牙MB2临床肉眼发现率为45.9％,年龄及再治疗对其发现率有显著影响.MB2在上颌第一磨牙中具有较高发生率,年轻患者及未经治疗病例在临床肉眼操作下更易发现MB2根管口.
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