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Abstract：
The aim of this study is to investigate the influence of printing material, build angle, and artificial aging on the accuracy of SLA- and DLP-printed occlusal devices in comparison to each other and to subtractively manufactured devices. A total of 192 occlusal devices were manufactured by one SLA-printing and two DLP-printing methods in 5 different build angles as well as milling. The specimens were scanned and superimposed to their initial CAD data and each other to obtain trueness and precision data values. A second series of scans were performed after the specimens underwent an artificial aging simulation by thermocycling. Again, trueness and precision were investigated, and pre- and post-aging values were compared. A statistically significant influence was found for all main effects: manufacturing method, build angle, and thermocycling, confirmed by two-way ANOVA. Regarding trueness, overall tendency indicated that subtractively manufactured splints were more accurate than the 3D-printed, with mean deviation values around ±0.15 mm, followed by the DLP1 group, with ±0.25 mm at 0 degree build angle. Within the additive manufacturing methods, DLP splints had significantly higher trueness for all build angles compared to SLA, which had the highest mean deviation values, with ±0.32 mm being the truest to the original CAD file. Regarding precision, subtractive manufacturing showed better accuracy than additive manufacturing. The artificial aging demonstrated a significant influence on the dimensional accuracy of only SLA-printed splints.
摘要：
本研究的目的是调查印刷材料的影响，构建角度,和人工老化对SLA和DLP打印的咬合设备的准确性进行比较，并与相减制造的设备进行比较。通过一种SLA打印和两种DLP打印方法以5种不同的构建角度以及铣削制造了总共192个咬合设备。样品被扫描并叠加到它们的初始CAD数据和彼此以获得真实和精确的数据值。在样品通过热循环进行人工老化模拟之后,进行第二系列扫描。再一次,真实性和准确性进行了调查，并比较了老化前后的值。发现所有主要影响具有统计学意义：制造方法，构建角度,和热循环，通过双向方差分析证实。关于真实，总体趋势表明，减法制造的夹板比3D打印的夹板更准确，平均偏差值在±0.15mm左右，其次是DLP1组，0度构建角为±0.25mm。在增材制造方法中，与SLA相比，DLP夹板在所有构建角度上的真实性均明显更高，具有最高的平均偏差值，±0.32mm是最真实的原始CAD文件。关于精度，减法制造比增材制造显示出更好的准确性。人工老化仅对SLA打印的夹板的尺寸精度有重大影响。
