不同数字印模技术对3D 打印模型精度的影响

摘要

Objective:To evaluate the accuracy of Cerec Bluecam and Cerec Omnicam with 3D printed resin models.Methods:A metal master model including 4 cylindrical metal preparations on the model base,respectively simulating the maxillary canine and the first molar preparations,was prepared.The right canine and the right first molar were respectively marked as A and B,and the left as C and D.The master model was scanned respectively by Cerec Bluecam and Cerec Omnicam for 10 times,10 digital models were genera-ted in Bluecam group and Omnnicam group respectively.Resin models were obtained by a 3D printer based on the digital models,the distance of AB,AC,BD and the diameter(d)of A were respectively measured.Statistical analysis was conducted by SPSS 13.0 soft-ware.Results:The distance of AB,AC,BD of master model and Bluecam group showed significant difference(P <0.05),but d did not(P >0.05);the distance of AC,BD of master model and Omnicam group showed significant difference(P <0.05),but d did not (P >0.05).All the distances of the Bluecam group and Omnicam group showed significant difference(P <0.05).Conclusion:The scanning accuracy of Cerec Bluecam is higher than that of Cerec Omnicam in a single preparation scanning.When the scanning area ex-tending,the scanning accuracy of Cerec Omnicam is higher than that of Cerec Bluecam.%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（P ＜0．05）；蓝光组与真彩组各距离差异均有显著性（P ＜0．05）。2组的 d 值与主模型差异无显著性（P ＞0．05）。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。