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.
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.
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：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%。
RESULTS: MB2 canal can be located in 60% and dilate 50% of 10 extracted maxillary first molars.
器械折断于上磨牙近颊根管和下磨牙近中根管者居多，占70.7%。器械折断在根管中下段多见，占70%。
Most of which happened in mesiobuccal canal of maxillary molar and mesial canal of mandibular molar, accounting for 70.7%.
结论磨牙控根移动杆具有良好防止磨牙推进器推两个磨牙远移过程中的不利副移动作用，并能避免第二磨牙颊向错位。
Conclusion The molar root movement controller could prevent the side effects and avoid the second molar buccally positioned movement in the process of molar propeller moving the two molars distally.
方法：选取40个下颌磨牙近中颊侧弯曲根管，随机分为两组，每组20个根管。
Method:40 curved mesial-buccal canals in mandibular molars were selected and divided into two groups randomly. Each group had 20 canals.
目的 确定人上颌第一前磨牙的颊舌向根管弯曲程度和情况。
The root canals in mandibular first premolars failed to be treated;
目的 确定人上颌第一前磨牙的颊舌向根管弯曲程度和情况。
The root canals in mandibular first premolars failed to be treated;
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