Li Yan, Li Hui, Lai Qingguo, Xue Runqi, Zhu Kaiwen, Deng Yanwei
The Second Hospital of Shandong University, Jinan, People's Republic of China.
Department of Dermatology, Jinan Central Hospital, Shandong University, Jinan, Shandong Province, People's Republic of China.
Comput Methods Biomech Biomed Engin. 2023 Jan;26(1):78-89. doi: 10.1080/10255842.2022.2047952. Epub 2022 May 19.
This paper discussed the size of 3 D-printed personalized titanium plates that can gain maximum stability of mandibular fracture and minimize stress shielding through finite element analysis. A 3 D virtual model of mandible with mandibular angle fracture was created from the CT data of patient. 3 D-printed personalized titanium plates varying in length and thickness were designed, and finite element analysis was performed under different loading conditions and fracture healing periods. After that, the stress distribution and deformation of the mandible with gonial fracture could be observed, and the stress shielding rate could be obtained. Finally, SPSS21.0 was used for statistical analysis. The results of finite element analysis indicated that as the thickness of titanium plates and the healing time decreased, the maximum displacement increased, under a certain condition in which the pore size, the width, the hole distance and the bridge spacing were 2.0 mm, 4.0 mm, 6.0 mm, 12.0 mm, respectively. What's more, in this condition, the thicker the titanium plate and the shorter the healing time were, the higher the stress shielding was at central occlusion. When the thickness of the personalized 3 D-printed titanium plate was 1.0 mm, the maximum displacement tended to be stable and the stress shielding was minimized. It can not only improve the bone stability after tension band fixation, but also minimize the stress shielding, which is expected to expand the indications of tension band fixation.
本文通过有限元分析探讨了能够使下颌骨骨折获得最大稳定性并使应力遮挡最小化的3D打印个性化钛板的尺寸。根据患者的CT数据创建了一个下颌角骨折的下颌骨三维虚拟模型。设计了长度和厚度不同的3D打印个性化钛板，并在不同加载条件和骨折愈合期进行了有限元分析。之后，可以观察到下颌角骨折下颌骨的应力分布和变形情况，并获得应力遮挡率。最后，使用SPSS21.0进行统计分析。有限元分析结果表明，在一定条件下，当孔径、宽度、孔距和桥间距分别为2.0mm、4.0mm、6.0mm、12.0mm时，随着钛板厚度减小和愈合时间缩短，最大位移增大。此外，在此条件下，钛板越厚、愈合时间越短，正中咬合时的应力遮挡越高。当个性化3D打印钛板厚度为1.0mm时，最大位移趋于稳定，应力遮挡最小。它不仅可以提高张力带固定后的骨稳定性，还能使应力遮挡最小化，有望扩大张力带固定的适应证。
