Clinician Scientist, Department of Oral and Maxillofacial Surgery, Translational Implantology, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
Anthropologist, Division of Biological Anthropology, Faculty of Medicine, University of Freiburg, Freiburg, Germany; Post-doctorate Scientist, Department of Oral and Maxillofacial Surgery, Translational Implantology, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
J Prosthet Dent. 2022 Dec;128(6):1303-1309. doi: 10.1016/j.prosdent.2021.03.007. Epub 2021 Apr 24.
The accuracy of intraoral scanners is a prerequisite for the fabrication of dental restorations in computer-aided design and computer-aided manufacturing (CAD-CAM) dentistry. While the precision of intraoral scanners has been investigated in vitro, clinical data on the accuracy of intraoral scanning (IOS) are limited.
The purpose of this clinical study was to determine the accuracy of intraoral scanning with different devices compared with extraoral scanning.
An experimental appliance was fabricated for 11 participants and then scanned intraorally and extraorally with 3 different intraoral scanners and a reference scanner. Intraoral and extraoral scans were subdivided into complete-arch and short-span scans and compared with the reference scan to assess trueness. Repeated scans in each group were assessed for precision.
Precision and trueness were higher for extraoral scans compared with intraoral scans, except for complete-arch scans with 1 intraoral scanner. The median precision of short-span scans was higher (extraoral: 22 to 29 μm, intraoral: 23 to 43 μm) compared with complete-arch scans (extraoral: 81 to 165 μm, intraoral: 80 to 198 μm). The median trueness of short-span scans (extraoral: 28 to 40 μm, intraoral: 38 to 47 μm) was higher than that of complete-arch scans (extraoral: 118 to 581 μm, intraoral: 147 to 433 μm) for intraoral and extraoral scanning.
Intraoral conditions negatively influenced the accuracy of the scanning devices, which was also reduced for the complete-arch scans.
口内扫描仪的准确性是计算机辅助设计和计算机辅助制造（CAD-CAM）牙科中牙科修复体制作的前提。虽然已经在体外研究了口内扫描仪的精度，但关于口内扫描（IOS）准确性的临床数据有限。
本临床研究的目的是确定与口外扫描相比，不同设备的口内扫描的准确性。
为 11 名参与者制作了一个实验性修复体，然后使用 3 种不同的口内扫描仪和参考扫描仪进行口内和口外扫描。口内和口外扫描分为全弓扫描和短跨度扫描，并与参考扫描进行比较以评估准确性。每组内的重复扫描用于评估精度。
与口内扫描相比，口外扫描的精度和准确性更高，除了一种口内扫描仪的全弓扫描。短跨度扫描的精度中位数更高（口外：22 至 29μm，口内：23 至 43μm），而全弓扫描的精度中位数较低（口外：81 至 165μm，口内：80 至 198μm）。短跨度扫描的准确性中位数（口外：28 至 40μm，口内：38 至 47μm）高于全弓扫描（口外：118 至 581μm，口内：147 至 433μm）。
口内条件会对扫描设备的准确性产生负面影响，全弓扫描的准确性也会降低。
