基于4种软件的牙周病患者牙齿建模和受力分析

Modeling and analysis for teeth of a patient with periodontal diseases based on four kinds of software

目的根据牙周病患者的牙齿CT数据和石膏模型,基于4种软件进行建模分析,获得病人牙齿受力和应力分布状况,为牙周病患者的临床治疗提供参考。方法利用Mimics软件对CT图像进行初步处理,建立三维点云模型;把初步建立的模型利用逆向工程软件Geomagic对模型进行参数化建模和修整,建立三维曲面模型;将曲面模型导入三维绘图软件Solid Works中,通过实体转换输出三维实体模型;最后利用有限元分析软件ANSYS对牙齿的三维实体模型进行分析。结果获得了上牙的应力分布,确定了应力集中点的位置。并对应力集中点的牙齿进行单独分析,其最大应力为1 774.8 MPa,再根据应力分布对咬合关系进行调整,调整后的牙齿最大应力减小为1 529 MPa。结论所介绍的牙齿建模分析方法,可以模拟各种咬合关系的修正,并计算修正后的牙齿应力分布,为牙周病的临床治疗提供理论依据。

Objective To provide references for the clinical treatment of patients with periodontal diseases by mod- eling and analysis based on four software and obtaining stress distributions of the patient＇ s teeth, according to CT data and plaster model of the patient＇ s teeth. Methods The CT data were preliminary processed by using Mimics software to establish three-dimensional （3D） cloud model. The 3D surface model of the teeth was then constructed by using Geomagic software to make parameter modeling and reverse engineering. The 3D surface model was imported into SolidWorks to obtain the 3D entity model by entity conversions. Finally, the 3D entity model was imported to ANSYS for analysis. Results The stress distributions on the upper teeth were obtained, and the location of stress concentration points was determined. The stress concentration points of the teeth were analyzed separately, and the maximum stress was 1 ？74.8 MPa. The occlusal relationship was adjusted based on stress distributions, and the maximum stress after adjustment was reduced to 1 529 MPa. Conclusions This dental modeling and analysis method can simulate various occlusal relationships and calculate tooth stress distri- bution after amendment, which provides the theoretical basis for clinical treatment of periodontal diseases.