纯钛个性化正畸托槽的设计与制造技术研究

摘要

Objective A titanium personalized orthodontic bracket is designed and manufactured using the technol-ogy of computed tomography (CT), computer aided design (CAD), finite element analysis (FEA), and selective laser melt-ing (SLM) to well match the patient tooth so as to realize mold-free manufacturing. Methods A model of a titanium personalized orthodontic bracket which is built by CT scanning machine and Pro/E software, is imported into Ansys soft-ware to carry out finite element simulation analysis with nonlinear contact method. Then, the titanium personalized orth-odontic bracket is proposed after the model data above is imported to SLM molding equipment via titanium powder melt-ed with layer by layer using a high-speed scanning galvanometer. Results The maximum equivalent stress of the titani-um personalized orthodontic bracket is distributed uniformly and reasonably, the titanium personalized orthodontic bracket formed by SLM molding equipment can provide high accuracy and there is a high similarity between the bottom of the orthodontic bracket and the tooth surface shape. Conclusion The combination of CT, CAD, FEA, SLM technolo-gy can fulfill model-free manufacturing of the personalized orthodontic bracket and thus shorten the manufacturing cycle.%目的 应用计算机断层扫描(computed tomography,CT)、计算机辅助设计(computer aided design,CAD)和选择性激光熔化(selective laser melting,SLM)技术,并结合有限元分析(finite element analysis,FEA)技术,设计制造与患者牙齿高度匹配的纯钛个性化正畸托槽,实现无模制造.方法 运用CT扫描与Pro/E三维建模软件,构建个性化正畸托槽模型,然后导入Ansys有限元分析软件,采用非线性接触的方式进行有限元仿真分析,最后将模型导入SLM成型设备中,采用高速扫描振镜,层层循环扫描,熔化钛粉层,成型为纯钛个性化自锁托槽.结果 自锁托槽的最大等效应力分布均匀合理,满足材料的力学性能要求,SLM成型后的纯钛个性化自锁托槽精度好,并且托槽底板与牙齿表面形状的相似度高,粘结致密性好.结论 将CT、CAD、FEA与SLM技术相结合,可实现自锁托槽的个性化无模制造,缩短制造周期.