first maxillary molars 上颌第一恒磨牙
RESULTS: MB2 canal can be located in 60% and dilate 50% of 10 extracted maxillary first molars.
结果：离体牙10颗，上颌第一磨牙近中颊根第二根管发现率为60%，通畅率为50%。
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。
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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