Objective To explore the effective method for C-shaped root canal preparation.
目的探索预备下颌第二磨牙C形根管的有效方法。
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。
Conclusion: Amalgam post and core technique is conservative in restoring molars for its curved root canal, big root furcation, C-shaped root canal and large pulp chamfer.
结论：对于根管弯曲、分叉大、髓室大、C型根管的磨牙，银汞桩核技术有着明显的优势。
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