三种不同桥体龈端形态的固定桥三维有限元模型的建立

Reconstruction of three-dimensional finite element model of fixed partial denture with three pontic types

目的:建立三种不同桥体龈端形态的固定桥的三维有限元模型,为探讨固定桥支持组织的生物力学机制奠定基础。方法:对健康成人牙列及牙槽骨进行CBCT扫描,利用Mimics 10.01、Geomagic studio 12、Solid Works2012软件,建立左下颌第一磨牙缺失,前磨牙及磨牙为基牙的固定桥模型,再模拟三种不同的桥体,即改良鞍式,改良盖嵴式,船底式桥体。最后利用Ansys 14.0对所建模型进行网格划分,并对模型进行验证。结果:成功的建立了三种不同桥体龈端形态的固定桥的三维有限元模型,由修复体,牙本质,牙髓,黏膜(0.8m m),牙周膜(0.2m m),皮质骨(1.0m m),松质骨组成,所得模型的几何形态及生物力学性能相似性良好。结论:CBCT扫描结合Mimics、Geomagic studio及Solid Works软件可以快速精确建立固定桥的三维有限元模型,为后期生物力学分析提供数字化模型。

Objective： To construct the three dimensional finite element model of FPD with three pontic types and to explore the biomechanical of support groups of FPD. Methods： By scanning healthy adult＇s tooth and alveolar bone with CBCT, a model of FPD was established with Mimics 10.01, Geomagic studio 12,Solid Works 2012 software. The abutments of the dentition were the mandibular left second premolar and left second molar, and the edentulous area was the mandibular left first molar region. Three different kinds of the bridge, modified saddle pontic, modified ridge-lap pontic and ovate pontic were simulated. The model was meshed and verified by using the Ansys 14.0 software. Results： The three-dimensional finite element model of fixed partial denture with three pontic types was established successfully, included prosthesis,dentin, endodontium, mucous（0.8mm）, periodontal ligament（0.2mm）, cortical bone（1.0mm）, cancellous bone. The geometry and biomechanical similarity of the model were good. Conclusion： CBCT scanning with Mimics, Geomagic studio and Solid Works software may be used for reconstruction of three-dimensional finite element model of fixed bridge that provides a digital model for biomechanics analysis.