Favero Christian S, English Jeryl D, Cozad Benjamin E, Wirthlin John O, Short Megan M, Kasper F Kurtis
Department of Orthodontics, School of Dentistry, University of Texas Health Science Center at Houston, Houston, Tex.
School of Dentistry, University of Texas Health Science Center at Houston, Houston, Tex.
Am J Orthod Dentofacial Orthop. 2017 Oct;152(4):557-565. doi: 10.1016/j.ajodo.2017.06.012.
Three-dimensional (3D) printing technologies enable production of orthodontic models from digital files; yet a range of variables associated with the process could impact the accuracy and clinical utility of the models. The objective of this study was to investigate the effect of print layer height on the accuracy of orthodontic models printed 3 dimensionally using a stereolithography format printer and to compare the accuracy of orthodontic models fabricated with several commercially available 3D printers.
Thirty-six identical models were produced with a stereolithography-based 3D printer using 3 layer heights (n = 12 per group): 25, 50, and 100 μm. Forty-eight additional models were printed using 4 commercially available 3D printers (n = 12 per group). Each printed model was digitally scanned and compared with the input file via superimposition analysis using a best-fit algorithm to assess accuracy.
Statistically significant differences were found in the average overall deviations of models printed at each layer height, with the 25-μm and 100-μm layer height groups having the greatest and least deviations, respectively. Statistically significant differences were also found in the average overall deviations of models produced using the various 3D printer models, but all values fell within clinically acceptable limits.
The print layer height and printer model can affect the accuracy of a 3D printed orthodontic model, but the impact should be considered with respect to the clinical tolerances associated with the envisioned application.
三维（3D）打印技术能够根据数字文件制作正畸模型；然而，与该过程相关的一系列变量可能会影响模型的准确性和临床实用性。本研究的目的是调查打印层高对使用立体光刻格式打印机三维打印的正畸模型准确性的影响，并比较使用几种商用3D打印机制作的正畸模型的准确性。
使用基于立体光刻的3D打印机以3种层高（每组n = 12）制作36个相同的模型：25、50和100μm。另外使用4种商用3D打印机打印48个模型（每组n = 12）。对每个打印模型进行数字扫描，并通过使用最佳拟合算法的叠加分析与输入文件进行比较，以评估准确性。
在每个层高打印的模型的平均总体偏差中发现了统计学上的显著差异，25μm和100μm层高组的偏差分别最大和最小。在使用各种3D打印机模型制作的模型的平均总体偏差中也发现了统计学上的显著差异，但所有值均落在临床可接受的范围内。
打印层高和打印机型号会影响3D打印正畸模型的准确性，但应根据与预期应用相关的临床公差来考虑这种影响。
