Obective To determine the clinical effects of preventing post treatment pain of root canal therapy(RCT) with Zhong Tong An(ZTA), a Chinese medicine.
目的对中成药肿痛安定风止痛胶囊（ZTA）用于预防根管治疗术后疼痛的临床疗效作出评价。
After perfect root canal therapy to the residual root and crown of the front tooth, it is the main repair method to utilize a post and core crown at present.
前牙残根残冠经过完善的根管治疗后，利用桩核冠修复在目前是主要的修复方法。
Method: The separate application of clamp, root elevator or drilling root canal according to different type of post pin and place of root surface.
方法：根据不同类型桩钉及根面所处位置，分别采用钳取、根尖挺挺出及钻磨取钉等方法。
FIBER post: Prepare the root canal with the Pre-Shaping and Finishing drills, according to manufacturer's instructions. METAL post: Sandblast the surface of the post.
纤维桩：依照厂商说明使用预成钻和完成钻进行根管预备。金属桩：对桩的表面喷砂。
Objective To study the effect of the various methods of root canal impression on the fixing power of post crown.
目的研究根管印模的不同方法对桩冠固位力的影响。
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。
Objective:To introduce a new prefabricated post-and -core system, a helical drilling bit and a prefabricated post-and -core consisting of a root canal orifice bur which was designed by the author.
目的：介绍一种由螺旋型根管钻、自行设计的根管口台阶状车针、预成桩核组成的预成桩核系统。
Methods87 cases were treated with routine post-and-core PFM crowns after root canal therapy respectively.
方法87例残根残冠经过完善的根管治疗后，用螺纹根管钉、光固化树脂核、金属烤瓷全冠进行修复。
Conclusion: The defect treatmen of glass fiber post in a single premolar tooth root canal can achieve satisfactory results.
近年来，作者采用玻璃纤维桩进行前磨牙牙体缺损的修复，取得了良好的临床效果。
Conclusion: The defect treatmen of glass fiber post in a single premolar tooth root canal can achieve satisfactory results.
近年来，作者采用玻璃纤维桩进行前磨牙牙体缺损的修复，取得了良好的临床效果。
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