1.西安医学院口腔医学院 陕西 西安;2.中国人民解放军总医院 北京;3.西安交通大学机械制造系统工程国家重点实验室 西安
目的 对3D打印个性化聚醚醚酮（PEEK）髁突假体进行有限元分析和压缩性能测试，分析假体的应力分布特征及机械力学性能，评估假体的临床应用价值及应用前景。方法 通过CBCT、Mimics 、Geomagic Studio、sholiworks和ANSYS Workbench等软件建立PEEK髁突假体、下颌骨和固定螺钉的有限元模型，加载最大咀嚼力，记录髁突假体和螺钉的最大应力以及下颌骨的应力应变。模拟临床实际情况，设计专用夹具，以1mm/min的速率对FDM和SLS两种方法制备的髁突假体进行压缩性能测试。结果 有限元分析发现，PEEK髁突假体的峰值应力位于髁突颈的后部，为10.733MPa；5个固定螺钉的峰值应力集中在靠近下颌升支后缘的2#和5#螺钉，为9.7075 MPa；假体和螺钉的峰值应力均小于其屈服强度。压缩实验发现，FDM和SLS制备髁突假体可承受的最大压力分别为3814.7±442.6 N和1193.970±260.350N；FDM制备假体相较于SLS制备不但压缩强度较大，且韧性较好。结论 3D打印个性化聚醚醚酮髁突假体显示出均匀的应力分布和较好的机械力学性能，可为PEEK作为修复颞下颌关节的重建材料提供理论依据。
Objective: The 3D printed personalized polyether ether ketone (PEEK) condyle prosthesis was subjected to finite element analysis and compressive performance testing, to analyze the stress distribution characteristics and mechanical properties of the prosthesis, and to evaluate the clinical value and prospect of the prosthesis. Methods: The finite element models of PEEK condyle prosthesis, mandible and fixation screw were established through softwares such as CBCT, Mimics, Geomagic Studio, sholiworks and ANSYS Workbench. Load the maximum mastication force, record the maximum stress of the condyle prosthesis and screw, and the stress and strain of the mandible. In order to simulate the actual clinical situation, a special fixture was designed to test the compression performance of the condyle prosthesis prepared by the two methods of FDM and SLS at a rate of 1 mm / min. Results: Finite element analysis found that the peak stress of the PEEK condyle prosthesis was located at the back of the condyle neck, which was 10.733MPa; the peak stress of the 5 fixing screws appeared on the 2 # and 5 # screws near the trailing edge of the mandibular ascending branch. The peak stress was 9.7075 MPa; the peak stress of both the prosthesis and the screw is less than its yield strength. The compression experiment found that the maximum pressure that the condyle prosthesis prepared by FDM and SLS can bear was 3814.7 ± 442.6 N and 1193.970 ± 260.350N respectively. Compared with the SLS preparation, the FDM prepared prosthesis not only had higher compression strength but also better toughness. Conclusion: 3D printed personalized polyetheretherketone condyle prosthesis shows uniform stress distribution and good mechanical and mechanical properties, which can provide a theoretical basis for PEEK as a reconstruction material for repairing temporomandibular joint.