Objective: To investigate the fitness of titanium complete denture base fabricated by laser rapid forming (LRF). Methods: Titanium denture base was designed and fabricated by LRF. After suitable treatment, the titanium base was fixed on the surface of the plaster cast. The fringe around the Ti base and the plaster cast was sealed by wax. Then dental flasking method was used and after the gypsum was solidified, the maxillary edentulous plaster east was removed. Another plaster cast which duplicated the surface of the Ti base was then made on the same plane in the flask. Both of the plaster casts were located in the same place of the LSH600 laser scan worktable and then the tissue surface of both casts was recorded as point clouds data. The data were automatically compared to calculate the discrepancies between those of titanium denture base and plaster east by applying reverse engineering software Surfacer 10.0. The situation of coincidence between 2 groups of data was distinguished by different color representing the distance between different regions.The traditional-made titanium denture base was set as the control. Results: By laser scan method and 3-dimentional computing, for LRF base plate, the maximum error was 0.646 mm and the average error was 0.334 mm. Whereas for the traditional one, the maximum error was 0. 352 mm and the average error was 0.135 mm. Conclusion: Comparing with the traditional method, the fitness of titanium denture base fabricated with LRF needs to be improved on the accuracy.%目的:评价新型激光快速成形方法制作全口义齿钛基托的适合性.方法:应用激光快速成形技术制作标准上半口无牙颌钛基托,将制作的基托置于无牙颌模型上,蜡封闭边缘后,装盒;待石膏凝固后,取出无牙颌模型,再次在型盒内灌制超硬石膏模型.待模型结固后,将两个模型分别置于LSH600三维激光扫描仪工作台上的同一位置并固定,利用三维激光扫描模型组织面,获得三维点云数据.利用反求软件Surfacer 10.0对获得的数据进行数据预处理,对2组数据间的差异进行自动分析.分析结果以颜色来显示2组数据重合的情况.传统方法制作钛基托作为对照.结果:通过激光三维扫描和数据三维拟合,激光快速成形制作的钛基托适合性最大误差为0.646 mm,平均误差为0.334 mm;传统方法制作钛基托适合性的最大误差为0.352 mm,平均误差为0.135 mm.结论:与传统制作方法相比,激光快速成形技术制作的钛基托适合性略偏低,需在加工精度上进一步的提高.
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