选择性激光熔覆钴铬钼合金可摘局部义齿支架的加工精度分析

Study on the accuracy of Co-Cr-Mo alloy removable partial denture framework fabricated by selective laser melting

目的:采用选择性激光熔覆(selective laser melting,SLM)技术制作钴铬钼合金可摘局部义齿(removable partial denture,RPD)支架,评估其加工精度。方法:采用3Shape三维光学扫描仪口外扫描上颌肯氏Ⅰ类牙列缺损石膏模型,将获取的三维形貌数据重建为数字化模型。利用3shape设计软件在其上进行RPD支架的计算机辅助(computer aided design,CAD)设计。SLM制作5个钴铬钼RPD支架,扫描各支架,获取三维数据,与原CAD数据进行逆向比对,评估其加工精度。结果:SLM钴铬钼支架在石膏模型上就位顺利,组织面与模型贴合,无翘动。与原模型之间的总体3D偏差值为(0.088±0.021)mm。结论:采用SLM技术打印的钴铬钼合金RPD支架偏差较小,精度较高。

PURPOSE:To evaluate the accuracy of Co-Cr-Mo alloy removable partial denture(RPD)frameworks,which were fabricated by selective laser melting(SLM)technology.METHODS:3 Shape 3 D optical scanner was used to scan a plaster model of maxillary Kennedy I dentition defect,and the obtained 3 D topographical data were reconstructed into a digital model.Computer-aided design(CAD)of RPD framework was performed using 3 shape design software.Five Co-CrMo RPD frameworks were fabricated by SLM technology,then each framework was scanned to obtain 3 D data and compared with the original CAD data,respectively,to evaluate the match accuracy.RESULTS:The Co-Cr-Mo scaffolds were in good position on the plaster model,and the tissue surface was adhered to the plaster model without warping.The overall 3 D deviation from the original model was(0.088±0.021)mm.CONCLUSIONS:The Co-Cr-Mo framework fabricated by SLM technology in this experiment has less deviation and higher accuracy.