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目的：分析选用不同上部连接设计时种植全口义齿及其支持组织的应力状况以指导临床设计。方法：用三维有限元法研究螺丝固定结构与球帽附着结构对种植体全口义齿应力状况的影响。结果：采用螺丝固定结构较采用球帽附着结构者，义齿的种植体骨界面应力高出６１％，基托应力高出２１８％，种植体本身应力及人造牙列应力变化不大。结论：球帽附着结构较螺丝固定结构能显著降低种植体骨界面应力和义齿基托应力，利于义齿坚固耐用和支持组织健康。
OBJECTIVE: To analyze the stress state of implantable complete dentures and their supporting tissues when choosing different upper connection design to guide the clinical design. Methods: The effects of screw fixation and ball cap attachment on the stress state of complete denture were studied by three-dimensional finite element method. Results: Compared with the screw-cap structure, the denture implants had a 61% higher implant interface stress and a 218% higher base-implant stress. The implant stress and artificial dentition stress did not change much. CONCLUSION: Compared with the screw fixation structure, the ball cap attachment structure can significantly reduce the stress of the implant bone interface and the stress of the denture base, which will help the denture to be durable and support the health of the tissue.