Department of Conservative and Prosthetic Dentistry, Faculty of Odontology, Complutense University of Madrid, Plaza Ramón y Cajal S/N, Ciudad Universitaria, 28040, Madrid, Spain.
Clin Oral Investig. 2022 Feb;26(2):1957-1962. doi: 10.1007/s00784-021-04174-2. Epub 2021 Sep 14.
The aim of the present cross-sectional study was to compare the interocclusal contact records obtained by three different digital methods (intra- and extraoral digital scanners and T-Scan III system) with the conventional method (articulating paper).
Twenty-five healthy volunteers were selected. As a control group, maximum intercuspation occlusal contacts were registered and photographed from the patients with an 8 µm articulating paper. Then, intraoral conventional elastomer impressions were taken and after obtaining the corresponding plaster models of every patient they were scanned with an extraoral scanner (Zfx Evolution, Zimmer Biomet Dental) (group 1). Moreover, digital impressions were made with an intraoral scanner (Trios Color POD, Phibo, 3Shape) and contacts were also registered (group 2). Finally, T-Scan III records were made and stored for further analysis (group 3). Two previously calibrated examiners independently evaluated the interocclusal contacts from every group. Data was analyzed by using Kappa index test and Pearson's chi-square test. Diagnostic tests and ROC curve were also performed.
Kappa interoperator index was 70.6% (better agreement). In Kappa intraoperator index, the best value was obtained in the intraoral scanner group (moderate agreement) and the worst with T-Scan III group (low agreement). ROC curve showed highest values in the intraoral scanner group (0.817) and lowest values in the T-Scan III group (0.613).
Results suggest greater reliability to record occlusal contacts with the intraoral scanner.
Intraoral scanners seem to be reliable in registering intermaxillary occlusal contacts when compared with the current gold standard.
本横断面研究的目的是比较三种不同数字方法（口内和口外数字扫描仪和 T-Scan III 系统）与传统方法（咬合纸）获得的咬合接触记录。
选择了 25 名健康志愿者。作为对照组，使用患者的 8 µm 咬合纸记录和拍摄最大牙尖交错咬合接触点。然后，对每位患者进行口内常规弹性印模，并在获得相应的石膏模型后，使用口外扫描仪（Zfx Evolution，Zimmer Biomet Dental）（第 1 组）进行扫描。此外，使用口内扫描仪（Trios Color POD，Phibo，3Shape）进行数字印模，并记录接触点（第 2 组）。最后，制作 T-Scan III 记录并存储以备进一步分析（第 3 组）。两名经过校准的检查者独立评估了每组的咬合接触点。使用 Kappa 指数检验和 Pearson 卡方检验分析数据。还进行了诊断检验和 ROC 曲线分析。
两位检查者之间的 Kappa 指数为 70.6%（更好的一致性）。在 Kappa 检查者内指数中，口内扫描仪组获得了最佳值（中度一致性），而 T-Scan III 组的最低值（低度一致性）。ROC 曲线显示口内扫描仪组的数值最高（0.817），而 T-Scan III 组的数值最低（0.613）。
结果表明，口内扫描仪在记录咬合接触点方面具有更高的可靠性。
与当前的金标准相比，口内扫描仪在记录颌间咬合接触方面似乎更可靠。
