Quintessence Int. 2021 Oct 19;52(10):904-910. doi: 10.3290/j.qi.b1901329.
To evaluate, in vivo, trueness and precision of two intraoral scanners, CEREC Omnicam (OMNI) and CEREC Primescan (PRIM), compared to a conventional impression serving as a master model.
Impressions were performed for seven participants. For each participant, conventional polyvinylsiloxane impression and digital impressions using two intraoral scanners, OMNI (software 4.6; CEREC ORTHO Protocol) and PRIM (10 digital impressions per participant, per scanner), were made. Conventional impression was digitized with a laboratory scanner (INEOS X5), and used as reference model. .STL files were superimposed with software (Geomagic Control X) using the tools Initial Alignment and Best Fit Alignment, and trueness and precision were evaluated. Statistical evaluation was performed with Shapiro-Wilk and Mann-Whitney tests (P < .05).
Total mean trueness for the OMNI system was 56.45 ± 7.80 µm, and 47.29 ± 5.47 µm for the PRIM system. Regarding precision, values from the OMNI system were 42.47 ± 6.91 µm and from the PRIM system 21.86 ± 4.40 µm. PRIM presented better results for both trueness (P = .000) and precision (P = .000) when compared to OMNI.
PRIM provided a better combination of trueness and precision than its predecessor OMNI. However, both PRIM and OMNI performed acceptably when performing indirect restorations, according to the current acceptable thresholds, considering both trueness and precision.
Full-arch impressions with Primescan presented more precision and trueness than Omnicam; however, compared to previous reported values of conventional impressions, they still presented lower accuracy.
体内评估两种口内扫描仪（CEREC Omnicam（OMNI）和 CEREC Primescan（PRIM）的准确性和精密度，与作为主模型的传统印模进行比较。
对 7 名参与者进行了印模。对于每个参与者，使用两种口内扫描仪（OMNI（软件 4.6；CEREC ORTHO 协议）和 PRIM（每个参与者每个扫描仪 10 个数字印模））和传统的聚硅氧烷印模进行数字印模。使用实验室扫描仪（INEOS X5）对传统印模进行数字化，并用作参考模型。使用软件（Geomagic Control X）的初始对准和最佳拟合对准工具对.STL 文件进行叠加，并评估准确性和精密度。使用 Shapiro-Wilk 和 Mann-Whitney 检验（P<.05）进行统计评估。
OMNI 系统的总平均准确性为 56.45±7.80 µm，PRIM 系统的准确性为 47.29±5.47 µm。关于精密度，OMNI 系统的值为 42.47±6.91 µm，PRIM 系统的值为 21.86±4.40 µm。与 OMNI 相比，PRIM 在准确性（P=.000）和精密度（P=.000）方面均表现出更好的结果。
PRIM 在准确性和精密度方面的表现优于其前身 OMNI。然而，根据当前可接受的阈值，考虑到准确性和精密度，PRIM 和 OMNI 进行间接修复时均表现出可接受的性能。
与 Omnicam 相比，使用 Primescan 进行全口印模具有更高的精度和准确性；然而，与之前报道的传统印模值相比，它们的准确性仍然较低。
