残根太短，一般无法利用桩冠修复。
Its unable to repair dowel crown because of its shorter root of tooth.
结论：桩冠修复方法可行，是一种简易、快速、经济、有效的保存患牙方法。
CONCLUSION: The method is easy, feasible, quick, economic and effective in preserving bad tooth.
结论：桩冠修复方法可行，是一种简易、快速、经济、有效的保存患牙方法。
CONCLUSION: The method is easy, feasible, quick, economic and effective in preserving bad tooth.
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