选区激光熔化制作可摘局部义齿钛合金支架成形质量初探

摘要

Objective To evaluate the processing accuracy,internal quality and suitability of the titanium alloy frameworks of removable partial denture (RPD) fabricated by selective laser melting (SLM) technique,and to provide reference for clinical application.Methods The plaster model of one clinical patient was used as the working model,and was scanned and reconstructed into a digital working model.A RPD framework was designed on it.Then,eight corresponding RPD frameworks were fabricated using SLM technique.Three-dimensional (3D) optical scanner was used to scan and obtain the 3D data of the frameworks and the data was compared with the original computer aided design (CAD) model to evaluate their processing precision.The traditional casting pure titanium frameworks was used as the control group,and the internal quality was analyzed by X-ray examination.Finally,the fitness of the frameworks was examined on the plaster model.Results The overall average deviation of the titanium alloy RPD framework fabricated by SLM technology was (0.089±0.076) mm,the root mean square erTor was 0.103 mm.No visible pores,cracks and other internal defects was detected in the frameworks.The framework fits on the plaster model completely,and its tissue surface fitted on the plaster model well.There was no obvious movement.Conclusions The titanium alloy RPD framework fabricated by SLM technology is of good quality.%目的 用选区激光熔化(selective laser melting,SLM)制作可摘局部义齿(removable partial denture,RPD)钛合金支架,评估其加工精度、内部质量及适合性,为SLM的临床应用提供参考.方法 以1例患者的石膏模型为工作模型,扫描并设计RPD支架,SLM制作8个RPD钛合金支架(Ti-6Al-4V).三维扫描支架,将获取的表面三维数据与原CAD模型对比,评价SLM钛合金支架的加工精度.以传统铸造纯钛支架为对照组,通过X线分析两组支架内部质量,并检查支架在石膏模型上就位的适合性.结果 SLM制作的RPD钛合金支架的加工精度为(0.089±0.076) mm,均方根误差为0.103 mm,支架内部无肉眼可见的气孔、裂痕等缺陷,支架与石膏模型紧密贴合,无明显翘动,适合性良好,与铸造纯钛支架相比无明显差别.结论 SLM制作的RPD钛合金支架成形质量良好.