Orthodontic resident, Department of Orthodontics, University Medical Center, University of Groningen, Groningen, The Netherlands.
Assistant professor, Department of Oral and Maxillofacial Surgery, University Medical Center, University of Groningen, Groningen, The Netherlands.
Am J Orthod Dentofacial Orthop. 2014 Jan;145(1):108-15. doi: 10.1016/j.ajodo.2013.05.011.
Rapid prototyping is a fast-developing technique that might play a significant role in the eventual replacement of plaster dental models. The aim of this study was to investigate the accuracy and reproducibility of physical dental models reconstructed from digital data by several rapid prototyping techniques.
Twelve mandibular and maxillary conventional plaster models from randomly chosen subjects were selected and served as the gold standard. The plaster models were scanned to form high-resolution 3-dimensional surface models in .stl files. These files were converted into physical models using 3 rapid prototyping techniques: digital light processing, jetted photopolymer, and 3-dimensional printing. Linear measurements on the plaster models were compared with linear measurements on the rapid prototyping models. One observer measured the height and width of the clinical crowns of all teeth (first molar to first molar) on all models (plaster and replicas) using a digital caliper. All models were measured 5 times with a 2-week interval between measurements.
The intraobserver agreement was high (intraclass correlation coefficient >0.94). The mean systematic differences for the measurements of the height of the clinical crowns were -0.02 mm for the jetted photopolymer models, 0.04 mm for the digital light processing models, and 0.25 mm for the 3-dimensional printing models. For the width of the teeth, the mean systematic differences were -0.08 mm for the jetted photopolymer models, -0.05 mm for the digital light processing models, and -0.05 mm for the 3-dimensional printing models.
Dental models reconstructed by the tested rapid prototyping techniques are considered clinically acceptable in terms of accuracy and reproducibility and might be appropriate for selected applications in orthodontics.
快速成型技术是一种快速发展的技术，可能在最终替代石膏牙模方面发挥重要作用。本研究旨在探讨几种快速成型技术从数字数据重建的物理牙模的准确性和可重复性。
从随机选择的受试者中选择 12 个下颌和上颌常规石膏模型作为金标准。对石膏模型进行扫描，以形成.stl 文件形式的高分辨率三维表面模型。这些文件通过 3 种快速原型制造技术（数字光处理、喷射光聚合和三维打印）转化为物理模型。将石膏模型上的线性测量值与快速原型模型上的线性测量值进行比较。一名观察者使用数字卡尺测量所有模型（石膏模型和复制品）上所有牙齿（第一磨牙至第一磨牙）的临床冠高度和宽度。所有模型均在 2 周的间隔内测量 5 次。
观察者间的一致性很高（组内相关系数>0.94）。临床冠高度测量的平均系统差异为：喷射光聚合模型为 0.02 毫米，数字光处理模型为 0.04 毫米，三维打印模型为 0.25 毫米。对于牙齿的宽度，平均系统差异为：喷射光聚合模型为 0.08 毫米，数字光处理模型为-0.05 毫米，三维打印模型为-0.05 毫米。
从测试的快速原型制造技术重建的牙模在准确性和可重复性方面被认为是临床可接受的，并且可能适用于正畸学中的某些应用。
