三维打印牙颌模型的计算机辅助测量与精确度研究

Research of Computer-aided Measurement and Accuracy of 3D Printing Dental Casts

牙颌模型是口腔正畸治疗的重要参考标准,传统的石膏模型易老化断裂,且存储不便;针对石膏模型制作过程效率较低、精度不高,提出了基于3D打印技术制作牙颌模型的实际方法,并应用计算机辅助测量,进行了模型精确度分析;首先通过将影像数据数字化建模,采用熔融沉积制造技术得到3D打印牙颌模型;其次制定模型精确度分析的测量项目与测量标准,利用计算机辅助测量与三维最佳拟合配准技术,分析模型精确度;最后对测量数据统计分析,并得到差异分布规律;实验结果表明,3D打印牙颌模型精确度完全能够满足临床需求,3D打印相较于传统的制作过程更高效和经济,计算机辅助的牙颌模型测量不但替代了传统的手工测量方式,也极大提高了测量的准确性与可重复性,具有很高的推广价值。

Dental casts have been used as a reference standard in orthodontic treatment,however,these traditional plaster casts are subject to degradation,fracture and storage inconvenience.Aiming at the low efficiency and low precision of the plaster casts making process,a practical method of making the dental casts based on 3D printing technology is put forward,and the accuracy of the casts is analyzed by computer-aided measurement.Firstly,the 3D printing dental casts is obtained by fused deposition modeling technique after building digital model of image data.Then the measurement items and measurement standards of accuracy analysis are developed,at the same time,the accuracy of the casts is analyzed using computer-aided measurement and best-fit algorithm.Finally statistical analysis is used to the measurement data and shows the difference distribution.Experimental results show that 3D printing dental casts have clinically acceptable accuracy,and 3D printing technology is more efficient and economical than the traditional production process.The computer aided measurement of dental casts not only replaces the traditional manual measurement method,but also greatly improves the accuracy and efficiency of the measurement,which has the potential to be applied for clinical pratice.