不同数字印模技术对3D打印模型精度的影响

发布时间：2019-04-27 03:26

【摘要】：目的:结合3D打印树脂模型评价2种椅旁扫描系统的扫描精度。方法:仿照上颌牙弓形态及大小制作一金属底座主模型,底座上设计4个柱形金属预备体,分别模拟上颌尖牙和第一磨牙的预备体,右侧尖牙和第一磨牙分别以A、B表示,左侧分别以C、D表示。分别利用Cerec蓝光照相系统和Cerec真彩摄像系统扫描主模型各10次,每次扫描生成一个数字化模型。用3D打印机打印出树脂模型(n=10),在三坐标测量机上分别测量主模型和树脂模型相应柱形金属预备体间的距离AB、AC、BD以及A的直径d。采用SPSS 13.0软件对测量结果进行统计分析。结果:蓝光组AB、AC、BD的距离,真彩组AC、BD的距离分别与主模型差异有显著性(P0.05);蓝光组与真彩组各距离差异均有显著性(P0.05)。2组的d值与主模型差异无显著性(P0.05)。结论:对单个预备体的扫描,Cerec蓝光照相系统精度高于Cerec真彩摄像系统;当扫描区域扩大,Cerec真彩摄像系统精度高于Cerec蓝光照相系统。
[Abstract]:Objective: to evaluate the scanning accuracy of two kinds of seat-side scanning system based on 3D printing resin model. Methods: the main model of a metal base was made by imitating the shape and size of the maxillary arch. Four cylindrical metal preparations were designed on the base to simulate the preparation of maxillary canines and first molars respectively, and the right fangs and first molars were expressed as A, B, respectively. The left side is expressed as C, D, respectively. Cerec blue-ray camera system and Cerec real-color camera system were used to scan the main model 10 times each time to generate a digital model each time. The resin model was printed out with a 3D printer. The distance between the main model and the resin model was measured on the coordinate measuring machine (CMM). The distance between the main model and the resin model corresponding to the cylindrical metal preform AB,AC,BD and the diameter d of A were measured on the CMM. The measurement results were statistically analyzed by SPSS 13.0 software. Results: the distance of AB,AC,BD in blue ray group and AC,BD in true color group were significantly different from that of main model (P0.05). There were significant differences in each distance between blue light group and true color group (P0.05), and there was no significant difference between the two groups in d value and main model (P0.05). Conclusion: the precision of Cerec Blu-ray photography system is higher than that of Cerec real-color camera system, and when the scanning area is enlarged, the accuracy of Cerec real-color camera system is higher than that of Cerec blue-ray photography system.
【作者单位】：河北医科大学口腔医学院·河北省口腔医学重点实验室;河北省秦皇岛市海港医院;
【基金】：河北省科技支撑计划项目(编号:13277766D) 河北省卫生计生委医学科学研究重点课题指导计划(编号:20150815)
【分类号】：R783.2

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