Quintessence Int. 2021 Jun 9;52(7):636-644. doi: 10.3290/j.qi.b1098315.
The goal of the study was to determine the effects of software updates on the trueness and precision of digital impressions obtained with a variety of intraoral scanner (IOS) systems.
Seven IOS systems were investigated. Each system was tested using two versions of software, with the second version being the latest at the time of conducting the study. Scans were performed on a custom mandibular typodont model with natural teeth that were either unrestored or restored with amalgam, composite, lithium disilicate, zirconia, and gold. Eight scans were obtained for each software version on any of the tested IOS systems. Experimental IOS scans were compared against an industry-standard master scan of the typodont obtained with an ATOS Capsule scanner proven to have a trueness of 3 µm and a precision of 2 µm. Isolation of each substrate material on the digital experimental and master scans was achieved using the Geomagic metrology software for subsequent analysis of the substrate influence on accuracy. A generalized linear mixed model was used to determine the influence of the software version on the trueness and precision of the impression scan.
For some IOS systems, scans made with older software versions differ in accuracy compared with those obtained with the most recent software versions. Trueness was improved for most scanners following the software update, although the Element2 IOS performance deteriorated. Software updates had lesser effects on precision and showed variable trends among different systems. Software updates also influence different substrate materials scans' accuracy, although the results show variability among IOS systems. When comparisons were done among IOS systems updated with the latest software version, best performers for complete arch trueness were the Emerald S, Trios 3, and Primescan systems.
Software updates have a statistically significant effect on the trueness and precision of different IOS systems. These updates can have both positive and negative effects on scan accuracy, although it appears that these variations are within the clinical acceptability levels.
本研究旨在确定软件更新对各种口内扫描仪（IOS）系统获取的数字印模的准确性和精度的影响。
研究考察了 7 种 IOS 系统。每个系统都使用两个版本的软件进行测试，第二个版本是研究进行时的最新版本。在带有天然牙齿的定制下颌模型上进行扫描，这些牙齿未经修复或用银汞合金、复合树脂、二硅酸锂、氧化锆和金修复。在任何经过测试的 IOS 系统上，对每个软件版本进行 8 次扫描。将实验性 IOS 扫描与使用证明具有 3 µm 准确性和 2 µm 精度的 ATOS Capsule 扫描仪获取的下颌模型工业标准主扫描进行比较。使用 Geomagic 计量软件实现对数字实验和主扫描中每个基底材料的隔离，以便随后分析基底对准确性的影响。使用广义线性混合模型确定软件版本对印模扫描准确性的影响。
对于某些 IOS 系统，与最新软件版本相比，较旧软件版本的扫描在准确性方面存在差异。大多数扫描仪在软件更新后准确性得到提高，尽管 Element2 IOS 的性能恶化。软件更新对精度的影响较小，并且在不同系统中显示出不同的趋势。软件更新还会影响不同基底材料扫描的准确性，尽管结果显示 IOS 系统之间存在差异。当对使用最新软件版本更新的 IOS 系统进行比较时，完整牙弓准确性表现最好的是 Emerald S、Trios 3 和 Primescan 系统。
软件更新对不同 IOS 系统的准确性具有统计学意义的影响。这些更新可能对扫描准确性产生积极和消极的影响，尽管这些变化似乎在临床可接受水平内。
