方法选择拔除4颗第一双尖牙的患者2 0例，采用方丝弓技术治疗。
Methods 20 subjects were chosen with 4 first premolars extraction based on diagnosis.
目的分析上颌第一双尖牙纵折粘结冠及桩核冠修复后牙体各部位的应力改变。
Objective to evaluate the change of the stress distribution of different treatment and compare with normal tooth.
结果老年牙齿楔状缺损好发于第一双尖牙，且楔缺损害以盘型、2度更为常见；
Results Wedge-shaped defects in the first premolar were commonly seen in elderly patients, moreover, the disc wedge and type 2 degrees were more common in the lack of damage.
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