目的：比较后牙成品螺纹桩核与铸造桩核的临床应用比较。
Objective: Comparing of clinic using of prefabricated screw and cast metal post-and-core of posterior tooth.
目的观察并比较成品金属螺纹桩和铸造金属桩在桩冠修复中的临床效果。
Objective to study the effect of using screw mental post and cast post in post crown restoring respectively and bring into com parison.
方法：通过5年的使用观察，比较成品螺纹桩核与铸造桩核固位力和核的强度。
Methods: Comparing of strength and retention of prefabricated screw and cast metal post-and-core of posterior tooth after 5 years using.
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