目的探讨在临床上上颌第一磨牙近中颊根第二根管(MB 2)的发现及扩通。

Objective To investigate the clinical discovery and expanding of the second mesiobuccal canal (MB2) in maxillary first molars.

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目的研究上颌第一磨牙近中颊根第二根管的临床发现率。

Aim To investigate the clinical incidence of the second mesiobuccal root canal of maxillary first molars.

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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.

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