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。
PURPOSE: to investigate the effect of root canal anatomy in maxillary first premolars on root canal treatment difficulty.
目的研究上颌第一前磨牙根管颊舌向的弯曲情况。
Objective To investigate root canal curvatures of human maxillary first premolars in buccolingual directions.
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 study the value of treatment of maxillary neuralgia by injecting dehydrated Alcohol into Pterygopalatine canal.
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