聚醚醚酮(PEEK)个性化重建板修复下颌骨缺损的三维有限元分析

Three-Dimensional Finite Element Analysis of PEEK Customized Reconstruction Plate for Mandibular Defect

目的应用三维有限元分析聚醚醚酮(PEEK)及其复合物重建板修复下颌骨缺损的应力分布。方法通过CBCT、Mimics、SolidWorks、Geomagic Studio和ANSYS Workbench等软件建立钛合金、聚醚醚酮(PEEK)、30%碳纤维增强聚醚醚酮(carbon-fiber-reinforced polyetheretherketone,CFR-PEEK)、68%CFR-PEEK重建板有限元模型,以钛合金作为对照。分别模拟两种咬合状态。载荷Ⅰ:前牙区垂直加载300 N;载荷Ⅱ:左侧后牙区垂直加载300 N。结果两种载荷下,重建板最大应力与其屈服强度的比值:PEEK模型>30%CFR-PEEK模型>钛合金模型>68%CFR-PEEK模型;颌骨最大应力:PEEK模型>30%CFR-PEEK模型>钛合金模型>68%CFR-PEEK模型。其中,在前牙区垂直载荷下,PEEK模型重建板和颌骨的最大应力都超过了其屈服强度,其他模型的最大应力均低于其屈服强度。结论 68%CFR-PEEK与钛合金有着相似的应力分布,可以满足颌骨缺损重建机械强度的要求,重建板出现断裂的风险较钛合金降低,但应力屏蔽的发生率略增高。研究结果可为修复下颌骨缺损的重建板材料的选择和临床应用提供依据。

Objective To study the stress distributions of mandible defect by reconstruction with polyetheretherketone(PEEK)and its composite reconstruction plate through three-dimensional finite element analysis.Methods The finite element models of reconstruction plate of titanium alloy,PEEK,carbon-fiber-reinforced polyetheretherketone(CFR)-PEEK with 30%endless carbon fibers and CFR-PEEK with 68%endless carbon fibers were established by CBCT scanning,Mimics software,SolidWorks,Geomagic Studio and ANSYS Workbench software,and titanium alloy served as control.Two occlusal situations were simulated in the mandible model.Loading I:anterior region loading with 300 N;loading II:left posterior region with 300 N.Results The ratio of the maximum Von Mises stress of the reconstructed plate to its yield strength under two load situations:PEEK system>30%CFR-PEEK system>titanium alloy system>68%CFR-PEEK system;the maximum stress of the mandible:PEEK system>30%CFR-PEEK system>titanium alloy system>68%CFR-PEEK system.In the PEEK system,the maximum Von Mises stress of reconstructed plate and mandibular exceeded its yield strength under loading I;in the other systems,the maximum Von Mises stresses of mandible and reconstruction plate were below the yield strength.Conclusions The reconstruction plate of CFR-PEEK with 68%endless carbon fibers distributed the stresses in a similar manner as the titanium reconstruction plate,which could meet the mechanical strength requirements of mandible defect reconstruction.The fracture risk of the reconstructed plate was lower than that of titanium alloy,but the incidence of stress shielding was slightly higher.The result can provide references for the selection of materials and clinical application of reconstruction plate for mandibular defects.