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首页> 外文期刊>The Angle orthodontist. >A validation study of reconstructed rapid prototyping models produced by two technologies
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A validation study of reconstructed rapid prototyping models produced by two technologies

机译：两种技术产生的重构快速原型模型的验证研究

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Objective: To determine the accuracy (trueness and precision) of two different rapid prototyping (RP) techniques for the physical reproduction of three-dimensional (3D) digital orthodontic study casts, a comparative assessment using two 3D STL files of two different maxillary dentitions (two cases) as a reference was accomplished. Materials and Methods: Five RP replicas per case were fabricated using both stereolithography (SLA) and the PolyJet system. The 20 reproduced casts were digitized with a highly accurate reference scanner, and surface superimpositions were performed. Precision was measured by superimposing the digitized replicas within each case with themselves. Superimposing the digitized replicas with the corresponding STL reference files assessed trueness. Statistical significance between the two tested RP procedures was evaluated with independent-sample t-tests (P Results: The SLA and PolyJet replicas showed statistically significant differences for trueness and precision. The precision of both tested RP systems was high, with mean deviations in stereolithographic models of 23 (±6) μm and in PolyJet replicas of 46 (±13) μm. The mean deviation for trueness in stereolithographic replicas was 109 (±4) μm, while in PolyJet replicas, it was 66 (±14) μm. Conclusions: Comparing the STL reference files, the PolyJet replicas showed higher trueness than the SLA models. But the precision measurements favored the SLA technique. The dimensional errors observed in this study were a maximum of 127 μm. In the present study, both types of reproduced digital orthodontic models are suitable for diagnostics and treatment planning.
机译：目的：为了确定两种不同的快速原型制作（RP）技术对三维（3D）数字正畸研究模型的物理复制的准确性（真实性和准确性），使用两个不同上颌牙列的两个3D STL文件进行比较评估（两种情况）作为参考。材料和方法：每个案例使用立体光刻（SLA）和PolyJet系统制造了五个RP复制品。使用高精度参考扫描仪将20个复制的铸模数字化，然后进行表面叠加。通过将每种情况下的数字化副本与其自身叠加来测量精度。将数字化副本与相应的STL参考文件叠加在一起，可以评估真实性。两次测试的RP程序之间的统计显着性通过独立样本t检验进行了评估（P结果：SLA和PolyJet副本在真实性和精度上显示出统计学上的显着差异。两个测试的RP系统的精度均很高，立体光刻的均值偏差型号为23（±6）μm，在PolyJet副本中为46（±13）μm。立体平版副本的真实度平均偏差为109（±4）μm，而在PolyJet副本中，真实度的平均偏差为66（±14）μm。结论：与STL参考文件相比，PolyJet副本的真实性要高于SLA模型，但精度测量更倾向于SLA技术，本研究中观察到的尺寸误差最大为127μm。复制的数字正畸模型适用于诊断和治疗计划。

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