磁固位与杆固位种植全口义齿的三维有限元应力分析

为了比较磁固位与杆固位两种形式种植全口覆盖义齿的生物力学效应，建立了二者的数学力学模型，采用三维有限元法计算其在相同的垂直和水平荷载下，下颌种植体周围骨内的应力峰值并进行比较。结果表明，种植体与义齿间的固位方式对种植体周围的骨内应力有明显影响；在荷载相同的条件下，磁固位全口覆盖义齿的种植体周围骨内应力较杆固位者明显降低，因而前者更有利于种植体周围牙槽骨组织的健康，为种植义齿的远期成功创造条件。本研究的结论对于临床种植义齿上部结构的设计有参考价值。

Three dimensional finite element stress analysis of magnetical retaining and bar retaining in overdenture implants

The purpose of this study was to determine which type of denture retaining implants can produce better biomechanical effect on the bone tissue. Two mechanical models of magnetically retained complete overdenture supported by osseo integrated implant and bar retained complete over denture supported by osseo integrated implant were made. The peak stress in mandibular peri implant bone tissue of the models were studied under the same loading conditions vertically and horizontally by three dimensional FEM stress analysis. The results were as follows: (1) Both types of dentures retention can produce significant stress effect on the peri implant and other regions of the jaw bone and (2) Magnetical retention is more beneficial to maintenance both of peri implant bone tissue and long term success of denture supported by osseo integrated implant than bar retention does.