目的：通过建立一个含不同直径、不同长度种植体的上颌骨三维有限元模型，并进行应力分析，选出最佳的支抗种植体。
Objective: Built a three-dimensional finite element maxillary model including different diameter and length anchorage implant and analysis it, which can be used to chose the best implant.
上颌骨长度增加。
结果：腭裂患者手术后都会出现不同程度上颌骨长度、高度及深度的发育不足，但早期手术的患者上颌骨发育状况并不明显差于晚期手术患者。
All data was used in studying the maxillary growth. Results:After the operation all patients app ear limits of maxillary growth in different degree and different way.
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