Choi J Y, Choi J H, Kim N K, Kim Y, Lee J K, Kim M K, Lee J H, Kim M J
Department of Oral and Maxillofacial Surgery, College of Dentistry, Seoul National University, Korea.
Int J Oral Maxillofac Surg. 2002 Feb;31(1):23-32. doi: 10.1054/ijom.2000.0135.
Rapid prototyping (RP) is a relatively new technology that produces physical models by selectively solidifying UV-sensitive liquid resin using a laser beam. The technology has gained a great amount of attention, particularly in oral and maxillofacial surgery. An important issue in RP applications in this field is how to obtain RP models of the required accuracy. We investigated errors generated during the production of medical RP models, and identified the factors that caused dimensional errors in each production phase. The errors were mainly due to the volume-averaging effect, threshold value, and difficulty in the exact replication of landmark locations. We made 16 linear measurements on a dry skull, a replicated three-dimensional (3-D) visual (STL) model, and an RP model. The results showed that the absolute mean deviation between the original dry skull and the RP model over the 16 linear measurements was 0.62 +/- 0.35 mm (0.56 +/- 0.39%), which is smaller than values reported in previous studies. A major emphasis is placed on the dumb-bell effect. Classifying measurements as internal and external measurements, we observed that the effect of an inadequate threshold value differs with the type of measurement.
快速成型（RP）是一种相对较新的技术，它通过使用激光束选择性地固化对紫外线敏感的液态树脂来制作实体模型。该技术已引起了广泛关注，尤其是在口腔颌面外科领域。在该领域的RP应用中，一个重要问题是如何获得所需精度的RP模型。我们研究了医学RP模型制作过程中产生的误差，并确定了每个制作阶段导致尺寸误差的因素。这些误差主要归因于体积平均效应、阈值以及地标位置精确复制的难度。我们在一个干燥颅骨、一个复制的三维（3-D）视觉（STL）模型和一个RP模型上进行了16次线性测量。结果表明，在这16次线性测量中，原始干燥颅骨与RP模型之间的绝对平均偏差为0.62±0.35毫米（0.56±0.39%），这比先前研究报告的值要小。主要重点在于哑铃效应。将测量分为内部测量和外部测量，我们观察到阈值不足的影响因测量类型而异。
