选区激光熔化直接成型个性化牙冠牙桥研究

为了探索应用数字化反求设计结合选区激光熔化快速成型技术制作个性化牙冠牙桥的可行性,通过Laser-denta扫描系统测量牙列模型并 3 维重建其数字化外形,采用计算机辅助设计了牙冠牙桥。利用自主研发的选区激光熔化快速成型设备Dimetal-280进行了316L不锈钢粉末的正交实验工艺研究,获得优化参量,并用该参量加工设计了牙冠牙桥。结果表明,该方法能快速而精确地制造出形状复杂的个性化牙冠牙桥,且成型速度快、尺寸精度高、表面质量好、误差在±0.15mm以内,未经打磨表面粗糙度达到20μm;与传统加工方式相比,反求工程结合选区激光熔化快速成型的方法能快速而精确地制造出形状复杂的个性化金属牙冠牙桥,为其应用于口腔修复体的计算机辅助设计与制造提供了科学依据。

Direct manufacturing of customized crowns and fixed bridge by selective laser melting

To evaluate the feasibility of designing and fabricating crowns and fixed bridge by means of the digital reverse engineering and selective laser melting rapid prototyping technology,an optical scanning system,Laserdenta was used to measure the dental cast and reconstruct its three-dimension digital profile.The shape of crowns and fixed bridge was designed by computer based on the digital dental cast.By using the Dimetal-280 selective laser melting rapid prototyping system,the crowns and fixed bridge of 316L stainless steel was made through orthogonal experiments for parameter optimization.The results show that the crowns and fixed bridge of 316L stainless steel have good surface quality,high accuracy of±0.15mm in dimension,good roughness of about 20μm.The technology of reverse engineering and direct manufacturing of complex customized metallic crowns and fixed bridge by selective laser melting shows obvious superiority with high speed,precise profile and good accuracy in size comparing with the traditional one so as to offer some evidence for its application in CAD/CAM of oral prosthesis.