平衡与非平衡咬合对种植全口义齿应力状况的影响

目的:研究咬合平衡与否对种植全口义齿应力状况的影响. 方法:建立种植全口固定义齿和种植全口覆盖义齿的三维有限元模型,然后进行侧方咬合平衡与不平衡、前伸咬合平衡与不平衡模拟加载分析. 结果:种植全口固定义齿侧方咬合平衡与否,其骨界面和基托应力变化不大,但前伸咬合平衡者较不平衡者骨界面和基托应力显著降低;种植全口覆盖义齿侧方和前伸咬合平衡者均较不平衡者骨界面应力明显降低. 结论:种植全口固定义齿侧方咬合平衡可不做为临床要求,而其前伸咬合平衡以及种植全口覆盖义齿侧方和前伸咬合平衡应做为临床常规设计.

Stress analysis of mandibular complete dentures supported by implants with various occlusions

AIM: To investigate the stress status of mandibular complete dentures supported by implants with various balanced or unbalanced occlusion. METHODS: A 3-D finite element model of mandibular complete dentures supported by implants was established to analyze the stress status with protrusive or lateral occlusions. RESULTS: To the osseointegrated implant-supported fixed prosthesis, the stresses of implant-bone interface and denture base in protrusive balanced occlusion were lower than those in protrusive unbalanced occlusion, but no distinct different between balanced and unbalanced lateral occlusions. To the osseointegrated implant-supported overdenture, its stresses in protrusive and lateral balanced occlusions were lower than those in their unbalanced ones. CONCLUSION: A balanced occlusal scheme should pay attention to the implant-supported overdenture, also to the implant-supported fixed prosthesis in protrusive occlusion, but not to the implant-supported fixed prosthesis in lateral occlusion.