纤维桩修复上颌前磨牙穿髓型楔状缺损三维有限元模型的建立

Construction of a three-dimensional finite element model of pulp-exposed maxillary premolar with wedge-shaped defect restored by fiber post

背景:纤维桩修复前磨牙穿髓型楔状缺损的三维有限元模型目前还未被建立。目的:建立纤维桩修复前磨牙穿髓型楔状缺损的三维有限元模型。方法:获取废弃的人上颌第一前磨牙标本,采集micro-CT图像信息,利用Mimics软件、Geomagic和Hypermesh软件建立结构层次清晰的纤维桩修复上颌第一前磨牙穿髓型楔状三维有限元模型。结果与结论:正常上颌第一前磨牙三维有限元模型单元总数180 119个,节点总数33 289个;与实体相比,纤维桩修复穿髓型楔状上颌第一前磨牙三维有限元模型外形逼真,图像质量佳,有精确网格划分,单元总数为237 496个,节点总数为43 965个,在几何、边界约束及力学相似性方面都获得很好效果,很好地模拟了患牙受到压力时所表现的应力情况,确定其大小及分布,为生物力学研究提供依据。

BACKGROUND:To date,there is no report on the successful construction of a three-dimensional finite element model of maxillary premolar with wedge-shaped defect restored by fiber post.OBJECTIVE:To establish the three-dimensional finite element model of maxillary premolar with wedge-shaped defect restored by fiber post.METHODS:Micro-CT was used to obtain imaging information of the human maxillary first premolar sample.Then Mimics,Geomagic and Hypermesh were used to establish a clear-structured three-dimensional finite element model of pulp-exposed maxillary premolar with wedge-shaped defect restored by fiber post.RESULTS AND CONCLUSION:The three-dimensional finite element model of normal maxillary premolar had 180 119 units and 33 289 nodes.Compared with the real subject,the three-dimensional finite element model of maxillary premolar with wedge-shaped defect restored by fiber post had vivid appearance,good image quality and accurate grid partitioning with 237 496 units and 43 965 nodes in total,which could obtain good results in the aspects of geometry,boundary constraint and mechanical compatibility.Moreover,it could better simulate the mechanical stress distribution of diseased teeth under occlusion to further confirm the magnitude and distribution of forces,thereby providing a better basis for future biomechanical studies.