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

目的研究上颌第一磨牙近中颊根第二根管的临床发现率。

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

目的研究上颌第一磨牙近中颊根第二根管的临床发现率。

youdao