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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 According to the dental CT data and gypsum model of patients with periodontal disease, four types of software were used for modeling analysis to get the stress and stress distribution of the teeth of the patients, and provide a reference for the clinical treatment of patients with periodontal disease. Methods Mimics software was used to initialize the CT images and establish a 3D point cloud model. The model was modeled and trimmed by Geomagic, a reverse engineering software, to build a three-dimensional curved surface model. The surface model was imported into the 3D solid drawing software Solid Works, through the entity conversion output three-dimensional solid model; Finally, the use of finite element analysis software ANSYS analysis of the three-dimensional solid model of teeth. Results The stress distribution of the upper teeth was obtained and the location of the stress concentration point was determined. The stress in the stress concentration point was analyzed separately. The maximum stress was 1774.8 MPa. Then the occlusal relationship was adjusted according to the stress distribution. The maximum tooth stress after adjustment was reduced to 1 529 MPa. Conclusion The tooth modeling and analysis method introduced in this paper can simulate the correction of various occlusal relations and calculate the corrected tooth stress distribution so as to provide a theoretical basis for the clinical treatment of periodontal disease.