应用激光近形制造方法制作口腔修复体的基础研究——用LOM法由层析测量数据制作实体牙颌模型

Fabrication of dental prosthesis with laser engineered net shaping method —— Solid dentognathic models built with the 3 D data obtained by laminated object manufacturing

目的 :由层析三维测量数据用分层实体制造法制作全牙列牙颌模型 ,为应用激光烧结金属或陶瓷粉末直接制作口腔修复体奠定基础。方法 :用 Solidworks软件将牙颌石膏模型层析测量数据由 DXF格式文件转换为 STL格式文件 ,用快速成型机 M- RPMS- II的数据检验与处理软件读入 STL 文件 ,进行实体分层 ,输出 CL I(common layerinterface)文件 ,用监控系统软件读入分层信息 ,设定加工参数 ,控制层厚 0 .1mm的涂敷纸逐层叠加制作牙颌模型。结果 :得到了纸质实体牙颌模型 ,其几何外形与牙颌模型高度一致 ,x,y,z方向上的精度误差小于 0 .3 mm。结论 :层析测量技术可精确测得牙颌模型外形三维数据 ,激光快速成型方法制作牙颌模型具有自动、快速。

?Objective: To establish solid dentognathic models for the final purpose of fabricating dental prosthesis by laser engineered net shaping method with metal or ceramic powders. Methods:Solid dentognathic models, whose 3 D data was measured by a digitizer by cutting and scanning layer by layer, were built by laminated object manufacturing. Solidworks was used to convert the 3 D data of the dentognathic models to STL format. Then the STL file was input into the computer,checked and processed by rapid apparatus M RPMS II and the STL data was converted to slice format such as CLI by processing software. At last the processing parameters were chosen and the 3 D dentognathic models was built layer by layer by laminating paper of 0.1 mm thin and every piece of paper was attached after the useless areas had been cut and marked by a laser. Results: The morphology of the solid dentognathic models built with paper was all in good agreement with the gypsum models and the differences between them were less than 0.3 mm in each direction. Conclusion: The morphologic data of the gypsum dentognathic model can be accurately measured by cutting and scanning layer by layer and the LOM method may be applied in fabricating solid dentognathic models automatically, rapidly and accurately.