三维点激光扫描仪的扫描可靠性研究

目的全面评价Roland LPX-1200三维点激光扫描仪的扫描可靠性，为临床研究提供参考。方法规则加工的仿牙齿样模具，使用Roland LPX 1200点激光扫描仪获得其数字化模型，通过比较不同起始位置的扫描结果，评价扫描仪的扫描可重复性；选择长，宽，高三维方向上65项测量项目，比较数字化模型测量与实物测量之间的差异，评价其扫描准确性。结果连续扫描以及改变扫描初始位置引起的扫描随机误差在0．02mm以内；数字化模型测量与实物测量之间的差值均数为0．0012±0．05mm，P〈0．05。结论扫描仪具有良好的可靠性，能满足正畸临床对模型测量精度的要求。

Reliability of a 3D spot laser scanner for orthodontic applications

Objective The purpose of the study was to evaluate the reliability of creating three dimensional （3D） object reconstructions using a Roland LPX-1200 3D spot laser scanner. Methods A digital model of a dentition-like metallic model was acquired through the use of Roland LPX-1200 laser scanner. We assessed the reproducibility of the scanner by comparing the outcomes of different scanning conditions. Accuracy was tested from the discrepancy between the digital model and the object by measuring 65 3D items. Results It was found that the error from different scanning conditions was within 0. 02 mm. The mean difference between the object and the digital model was -0. 023 mm （±0. 079 mm）. There wasn ＇t any statistic difference （P〉0. 05）. Conclusions The findings suggest that the Roland LPX-1200 3D spot laser scanner has great clinical potential for its good reliability.