Faculty of Odonto-Stomatology, University of Medicine and Pharmacy at Ho Chi Minh City, 652 Nguyen Trai, Ward 11, District 5, Ho Chi Minh City 749000, Vietnam.
Faculty of Odonto-Stomatology, University of Medicine and Pharmacy at Ho Chi Minh City, 652 Nguyen Trai, Ward 11, District 5, Ho Chi Minh City 749000, Vietnam.
J Dent. 2023 Dec;139:104747. doi: 10.1016/j.jdent.2023.104747. Epub 2023 Oct 19.
The accuracy of 3-dimensional images produced by the intraoral scanner (IOS) is affected by scanning-aid materials. This in vitro study aimed to elucidate the influence of scanning-aid materials on the accuracy (trueness and precision) of digital scanning on the bilateral upper posterior edentulous jaw (Kennedy class I).
The asymmetrical bilateral upper posterior edentulous model (reference model) was generated using a 3D printer with three groups (application of TiO powder - composite and no-treatment control). The experimental scans were executed (n = 10 per group) using TRIOS3 (3shape), while one reference scan was obtained by an industrial scanner (Solutionix - C500). Values of trueness and precision were evaluated using the 3D superimposition method on mean deviation values. The accuracy was assessed using mean deviation values following the 3D superimposition method.
IOS had high trueness (20.6 µm), and significant differences were found between the no-treatment and TiO groups. Considering the cut-off value of deviations as 300 µm for clinical acceptability, the analysis clarified the most variations in the control group. There was a significant difference between the no-treatment group and others in the maxillary tuberosity area relating to long-span edentulous. The composite group had the best precision values (1.1 µm). Significant differences were found between composite and TiO groups (2.7 µm).
The bilateral upper posterior edentulous jaw digital impressions obtained using IOS were accurate. However, the digital images in the palate and maxillary tuberosity area related to long-span edentulous differed significantly. TiO-containing powder and composite landmarks affected the accuracy and stability of the IOS.
Scanning aid materials can increase the accuracy of the bilateral upper posterior edentulous jaw scanning with IOS.
口内扫描仪（IOS）生成的三维图像的准确性受扫描辅助材料的影响。本体外研究旨在阐明扫描辅助材料对双侧上颌后牙缺失（Kennedy 第一类）数字化扫描准确性（准确性和精密度）的影响。
使用 3D 打印机生成不对称双侧上颌后牙缺失模型（参考模型），分为三组（TiO 粉末-复合材料和无处理对照组）。使用 TRIOS3（3shape）进行实验扫描（每组 10 个样本），同时使用工业扫描仪（Solutionix - C500）获得一个参考扫描。使用三维叠加法评估准确性，通过均方根偏差值评估准确性。
IOS 具有较高的准确性（20.6µm），无处理组和 TiO 组之间存在显著差异。考虑到 300µm 的偏差值作为临床可接受性的截止值，分析表明对照组的变化最大。在上颌结节区域与长跨度缺失相关的无处理组与其他组之间存在显著差异。复合组具有最佳的精度值（1.1µm）。复合组和 TiO 组之间存在显著差异（2.7µm）。
使用 IOS 获得的双侧上颌后牙数字化印模是准确的。然而，与长跨度缺失相关的腭部和上颌结节区域的数字图像存在显著差异。含 TiO 粉末和复合标志点会影响 IOS 的准确性和稳定性。
扫描辅助材料可以提高 IOS 对双侧上颌后牙缺失扫描的准确性。
