Jung Yoo-Ran, Park Ji-Man, Chun Youn-Sic, Lee Kkot-Nim, Kim Minji
Int J Comput Dent. 2016;19(3):203-15.
The objective of this study was to compare the accuracy of four different digital intraoral scanners and the effects of buccal brackets and orthodontic wire.
For this study, three sets of models (Control model, BKT model with buccal bracket, and WBKT model with buccal bracket and orthodontic wire) were scanned using four different types of intraoral scanners: E4D dentist, iTero, Trios, and Zfx IntraScan. The mesiodistal width of the teeth, intercanine width, and intermolar width measured by four scanners were compared. Three-dimensional (3D) images of the brackets were taken using the four scanners. Data were analyzed with one-way ANOVA, independent t test, and post-hoc Tukey test at a significance level of P < 0.05.
When comparing the 3D images with manual measurements using a traditional caliper, iTero and Trios showed the highest accuracy in horizontal measurements.iTero had the lowest values in Devmax-min of maxillary intermolar and intercanine widths (0.16 mm and 0.20 mm, respectively), whereas Trios had the lowest values in Devmax-min of mandibular intermolar and intercanine widths (0.36 mm and 0.14 mm, respectively). The horizontal variables were barely affected by the presence of buccal brackets and orthodontic wire. Comparison of 3D bracket images scanned by the four scanners showed differences in image distortion among the scanners. Bracket characteristics did not affect the 3D bracket images.
The four intraoral scanners used in this study differed in accuracy. However, the results acquired by iTero and Trios were more reliable. Effects of buccal brackets and orthodontic wire on the 3D images taken by intraoral scanners were not clinically significant.
本研究的目的是比较四种不同数字口内扫描仪的准确性以及颊面托槽和正畸弓丝的影响。
在本研究中，使用四种不同类型的口内扫描仪：E4D牙医扫描仪、iTero扫描仪、Trios扫描仪和Zfx IntraScan扫描仪，对三组模型（对照模型、带颊面托槽的BKT模型和带颊面托槽及正畸弓丝的WBKT模型）进行扫描。比较四种扫描仪测量的牙齿近远中宽度、尖牙间宽度和磨牙间宽度。使用四种扫描仪拍摄托槽的三维（3D）图像。采用单因素方差分析、独立t检验和事后Tukey检验对数据进行分析，显著性水平为P < 0.05。
将3D图像与使用传统卡尺进行的手动测量进行比较时，iTero和Trios在水平测量中显示出最高的准确性。iTero在上颌磨牙间和尖牙间宽度的Devmax-min中值最低（分别为0.16 mm和0.20 mm），而Trios在下颌磨牙间和尖牙间宽度的Devmax-min中值最低（分别为0.36 mm和0.14 mm）。水平变量几乎不受颊面托槽和正畸弓丝的影响。对四种扫描仪扫描的3D托槽图像进行比较，结果显示扫描仪之间存在图像失真差异。托槽特征不影响3D托槽图像。
本研究中使用的四种口内扫描仪在准确性上存在差异。然而，iTero和Trios获得的结果更可靠。颊面托槽和正畸弓丝对口内扫描仪拍摄的3D图像的影响在临床上并不显著。
