A new optical 3-D device for the detection of wear
A new optical 3-D device for the detection of wear
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DOI：
10.1177/00220345970760111201
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发表时间：
1997-11-01
影响因子：
7.6
通讯作者：
Hickel, R
中科院分区：
文献类型：
--
作者：
Mehl, A;Gloger, W;Hickel, R
为了准确评估新型牙科修复材料的临床性能，必须阐明修复体功能表面随时间的三维解剖学变化。为此，我们开发了一种高精度 3D 光学扫描仪，它利用三角测量原理和无参考自动 3D 叠加软件。本研究的目的是评估新系统在有参考定位和无参考定位的情况下的准确度和精密度。此外，该系统还具有确定后部填充物三维磨损情况的能力。对修复牙齿的石膏复制品进行了评估。在 20 至 40 秒的测量时间内以 250,000 个表面点的分辨率扫描牙齿表面。结果表明，3D 数据采集的精度和准确度取决于表面倾角。角度达到 60 度时，精度优于 3 μm，准确度优于 6 μm。如果可以在咬合负载前后精确重新定位物体（例如，通过体外研究），则可以以 2.2 μm 的精度确定表面差异。在临床研究中必需的无参考测量中，3D 数据采集与自动匹配程序相结合可以以 10 μm 的精度检测磨损。该测量装置在检测口腔中复合填充物的磨损方面的应用已被证明。由于这种测量技术是自动化的，并且可以在短时间内获得高精度的测量，因此该系统为临床研究中对大量样品进行复杂的三维磨损分析提供了可能性。
For the clinical performance of new dental restorative materials to be accurately assessed, the three-dimensional anatomical changes of the functional surfaces of the restoration must be elucidated over time. To this end, a highly accurate 3-D optical scanner has been developed that utilizes the principles of triangulation and a reference-free automated 3-D superimposition software. The aim of this study was to assess the accuracy and the precision of the new system with and without referenced positioning. Additionally, the ability of the system to determine wear of posterior fillings three-dimensionally has been shown. Gypsum replicas of restored teeth were evaluated. The tooth surfaces were scanned with a resolution of 250,000 surface points within a measuring time of 20 to 40 sec. The results show that the precision and accuracy of 3-D data acquisition depend on the surface inclination. Up to an angle of 60 degrees, the precision is better than 3 mu m, and the accuracy is better than 6 mu m If exact repositioning of the object before and after occlusal loading is possible, e.g., with in vitro studies, differences on the surface can be determined with a precision of 2.2 mu m. In reference-free measurements, which are a necessity in clinical studies, the 3-D data acquisition in combination with the automatic matching program can detect wear with an accuracy of 10 mu m The application of this measuring device for the detection of wear of a composite filling functioning in the mouth has been shown. Since this measuring technique is automated, and measurements of high accuracy can be attained in a short period of time, this system offers the possibility for complex analyses of three-dimensional wear to be conducted on a large number of samples in clinical studies.