Annu Int Conf IEEE Eng Med Biol Soc. 2016 Aug;2016:2198-2201. doi: 10.1109/EMBC.2016.7591165.
In mandibular reconstructive surgery, straight surgical plates are predominantly used for osteotomy. In this process, a straight plate is bent to fit to the shape of the patient's defect. This potentially compromises the stability of the plate because of changes in mechanical properties resulting from plastic deformation; however, the effect of plastic deformation on stability has yet been investigated. In this study, we assess the stability of three types of commonly used bent plates for two types of mandible defect cases, using three-dimensional finite element analysis (FEA). We compare the stability of plastically deformed plates with customized plates having the same shape, but not the residual stresses from plastic deformation. The results indicate that while the bearing strength of the bent plate is sufficient, there is much higher stress in the plate due to the residual stresses from the bending process that may significantly decrease the safety of the reconstruction surgery.
在下颌骨重建手术中，直形手术钢板主要用于截骨术。在此过程中，直形钢板会被弯曲以适应患者缺损的形状。由于塑性变形导致机械性能发生变化，这可能会损害钢板的稳定性；然而，塑性变形对稳定性的影响尚未得到研究。在本研究中，我们使用三维有限元分析（FEA）评估三种常用弯曲钢板在两种下颌骨缺损病例中的稳定性。我们将塑性变形钢板的稳定性与形状相同但没有塑性变形残余应力的定制钢板进行比较。结果表明，虽然弯曲钢板的承载强度足够，但由于弯曲过程产生的残余应力，钢板中的应力要高得多，这可能会显著降低重建手术的安全性。
