The aim of this study was to evaluate the accuracy of two intraoral scanners used in the dental office. A molar fixed in a typodont was prepared for a ceramic onlay. The preparation was scanned using a high-resolution scanner (reference scanner) and saved as stereolithography (STL) format. The prepared resin molar was scanned again using the intraoral scanners, and all the scans were saved as well in STL format. All STL files were compared using metrology software (Geomagic Control X). Overlapping the meshes allowed the assessment of the scans in terms of trueness and precision. Based on the results of this study, the differences of trueness and precision between the intraoral scanners were minimal.

中文翻译：

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两个口腔内扫描仪的真实度和精确度：一项比较体外研究

本研究的目的是评估牙科诊所使用的两台口腔内扫描仪的准确性。为陶瓷嵌体准备了固定在牙齿上的臼齿。使用高分辨率扫描仪（参考扫描仪）扫描制剂并保存为立体光刻 (STL) 格式。使用口内扫描仪再次扫描制备的树脂磨牙，并且所有扫描也以STL格式保存。使用计量软件 (Geomagic Control X) 比较所有 STL 文件。重叠网格允许在真实性和精度方面评估扫描。根据这项研究的结果，口腔内扫描仪之间的真实性和精度差异很小。