A STUDY OF FABRICATION OF CROWNS BY STEREO LITHOGRAPHY

本研究的目的是尝试用激光光刻或计算机辅助制造的机器制造冠。首先对加工精度进行了研究，确定了最合适的加工工艺（激光器输出功率：13mVV，扫描速度：240mm/s，激光光斑直径：0.2 mm， Z方向产品层距：0.07 mm，扫描方式：正常扫描）。在全冠数据方面，采用尼康公司、GC公司、日立公司开发的牙科CAD/CAM系统进行全冠设计。将其作为Bezie曲面贴片在cause中输出后，我们将其输入到光成型装置的控制工作站。然后进行了工艺条件的设定、仿真和树脂模型的制作。建立了真实患者口腔基牙树脂冠模型的制作工艺。制作的一种冠形也忠实地复制了CAD的设计。但在使用树脂收缩率使之在基牙中大为适应之前，这是今后的研究课题。

The aim of this study is to try fabrication of crowns by laser lithography or machine of computer aided manufacturing. First we studied about processing precision and established the most suitable processing (output power of laser : 13mVV,scan speed : 240mm/s, diameter of laser spot : The 0.2 mm, product layr pace of Z direction : 0.07 mm, scan method : Normal scan). As for data of crowns, we designed full crowns using Dental CAD/CAM system which NIKON co., GC co., HITACHI co.developed. And we input it into a work station for the control of light molding device after having ontput this as Bezie curved surface patch in the cause. And then, we did setting of processing condition, a simulation and made resin model. As the results the manufacturing process that made resin model of crown for abutment tooth in the mouth of real patient was established. A form of crown made reproduced a design of CAD faithfully, too. But what was careless is regarded as future examination subject till the resinous shrinkage rate used adapts it in abutment tooth greatly.