Its unable to repair dowel crown because of its shorter root of tooth.
残根太短，一般无法利用桩冠修复。
Conlusion: the restoration of molars residual root and crown of the aged can be improved by means of split dowel crown.
结论：分体桩核冠能较好地修复老年人磨牙残根残冠。
Abstract: Objective to compare the restorative effects of crown lengthening surgery and gingivectomy on dowel crown of deep-seated subgingival teeth fracture.
摘要：目的比较牙冠延长术与牙龈切除术用于残根残冠桩冠修复中的疗效。
Conclusion This method could obtain the strength of crown dowel with root cavity without fall and cleft so that to save time and payment and prolong the use of ceramic teeth.
结论用铸造法制作桩冠桩核强度高，与根管壁密合，粘固手不易脱落与原烤瓷牙冠密合，不需要重新制作，节约了时间和费用，延长了烤瓷冠的使用寿命。
Conclusion This method could obtain the strength of crown dowel with root cavity without fall and cleft so that to save time and payment and prolong the use of ceramic teeth.
结论用铸造法制作桩冠桩核强度高，与根管壁密合，粘固手不易脱落与原烤瓷牙冠密合，不需要重新制作，节约了时间和费用，延长了烤瓷冠的使用寿命。
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