【摘要】 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。更多还原

【Abstract】 Objective A titanium personalized orthodontic bracket is designed and manufactured using the technology of computed tomography(CT),computer aided design(CAD),finite element analysis(FEA),and selective laser melting(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 software to carry out finite element simulation analysis with nonlinear contact method.Then,the titanium personalized orthodontic bracket is proposed after the model data above is imported to SLM molding equipment via titanium powder melted with layer by layer using a high-speed scanning galvanometer.Results The maximum equivalent stress of the titanium 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 technology can fulfill model-free manufacturing of the personalized orthodontic bracket and thus shorten the manufacturing cycle.更多还原