The incidence of C-shaped root canal system is verdicted according to its anatomic features.
根据C形根管系统的解剖学特征判断其发生率。
AIM: To discuss the clinical diagnosis and treatment of root canal system of mandibular second molars.
目的：探讨下颌第二磨牙根管系统的特征及临床诊断和治疗方法。
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。
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