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近颊

近颊

近颊

1

Incidence rate of 4 root canals in maxillary second molar is very low and most molars have only two mesiobuccal root canals.

上颌第二磨牙四根管发生率低，且主要类型为近颊双根管的四根管，腭侧双根管的四根管十分罕见。

2

Most of which happened in mesiobuccal canal of maxillary molar and mesial canal of mandibular molar , accounting for 70 . 7%.

器械折断于上磨牙近颊根管和下磨牙近中根管者居多，占 70 .

4

Clinical feature and treatment of the second mesiobuccal canals of permanent maxillary first molars

上颌第一磨牙近颊第二根管的临床治疗

5

Factors hampering the negotiability of second mesiobuccal canals in upper molars

影响器械进入上颌磨牙近颊根第二根管的因素

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