Results Of the 24 maxillary first molars of 20 patients, 14 of the molars had second mesiobuccal root canals.
结果20例患者的24颗上颌第一磨牙中有14颗存在近中颊根第二根管，发现率为58。
Results Of the 24 maxillary first molars of 20 patients, 14 of the molars had second mesiobuccal root canals.
结果20例患者的24颗上颌第一磨牙中有14颗存在近中颊根第二根管，发现率为58。
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