PURPOSE: to investigate the effect of root canal anatomy in maxillary first premolars on root canal treatment difficulty.
目的：探讨上颌第一前磨牙的根管解剖形态对根管治疗术难度的影响。
Objective the aim of this study was to investigate the root canal system of maxillary first premolar .
目的观察离体上颌第一前磨牙根管解剖结构。
Objective To investigate the clinical discovery and expanding of the second mesiobuccal canal (MB2) in 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 root canal curvatures of human maxillary first premolars in buccolingual directions.
目的研究上颌第一前磨牙根管颊舌向的弯曲情况。
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。
Objective To investigate root canal curvature in maxillary anterior teeth.
目的了解上颌前牙根管弯曲情况。
Objective To investigate the root and canal morphology of extracted maxillary second premolars.
目的观察上颌第二前磨牙的牙根及根管形态。
Objective: To analyse the root canal curvature frequency, position, direction and degree of the maxillary first molars.
目的：分析上颌第一磨牙根管弯曲位置、方向及弯曲度。
Conclusions: The roots of maxillary first premolars possesses a variety of canal system types.
结论：上颌第一前磨牙的根管类型相对复杂。
Objective To study the shape and location of root canal orifice in maxillary first permanent molar and provide a morphological basis for locating canal orifice in endodontic therapy.
目的研究上颌第一磨牙根管口形态和位置关系，为根管治疗时寻找根管口提供解剖学依据。
Objective: to study the value of treatment of maxillary neuralgia by injecting dehydrated Alcohol into Pterygopalatine canal.
目的：探讨翼腭管注射无水乙醇治疗原发性上颌神经痛的价值。
Objective To measure the thickness of the wall of root canal and root canal area in different cross sections of maxillary central incisors.
目的了解正常上颌中切牙牙根不同截面根管周壁厚度及根管面积和形态。
Result: Images based on cone beam CT can clearly display the spatial relationship between root and maxillary sinus as well as inferior alveolar nerve canal.
结果：锥型线束CT可清楚显示牙根与下牙槽神经管及上颌窦之间的解剖关系。
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70.7%。器械折断在根管中下段多见，占70%。
Methods: Retrospectively analyzed 78 patients with maxillary neuralgia treated by injecting dehydrated Alcohol into Pterygopalatine canal in 5 years.
方法：回顾近5年78例患者的临床资料作为研究对象进行分析。
Abstract: Objective to investigate the canal morphology of maxillary first premolar using cone-beam ct (CBCT) and to know its generic and variant forms.
摘要目的采用锥形束ct (CBCT)探讨上颌第一前磨牙根管的解剖形态，了解其常规形态及变异形态。
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%。
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%。
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