Academic Teaching and Research Institution of Johann Wolfgang Goethe University, Frankfurt, Germany.
Academic Teaching and Research Institution of Johann Wolfgang Goethe University, Frankfurt, Germany.
J Dent. 2024 Nov;150:105336. doi: 10.1016/j.jdent.2024.105336. Epub 2024 Sep 12.
To evaluate the effect of intraoral scanners (IOSs) and implant libraries (ILs) on the trueness of digital impressions for the fabrication of implant-supported full-arch (FA) prostheses.
A stone cast of an edentulous maxilla with 6 implant analogues and cylindrical scanbodies (IPD ProCam®, Matarò, Barcelona, Spain) was probed using a coordinate measuring machine to capture a reference model (RM). The cast was mounted on a mannequin and scanned with 3 different IOSs (iTERO Element 5D Plus®, Align Technologies, San José, CA, USA; IS 3800®, Dexis, Quackertown, PN, USA; and i-700®, Medit, Seoul, South Korea). Ten scans were performed by an experienced operator using each IOS, first capturing only the occlusal surfaces, then the buccal and finally the palatal surfaces (less than 45 s per scan). In each scan, the meshes of the SBs were replaced by the corresponding IL file, with and without increment, to obtain the best correction for the mesh growth. The positions of the SBs in each file were compared with those in the RM, to evaluate the linear and cross distances between them. The final outcome was the trueness of the different IOSs, evaluating the effect of using different ILs on the quality of the impressions.
Significant differences were found between the different IOS scans and the RM, and among the different IOSs, in the different segments. The correction of the mesh growth through incremental ILs did not affect the final trueness of the IOS scans.
Different levels of trueness were found among the IOSs evaluated, in the different scan segments, but with the cylindrical SBs used herein, the correction of the mesh growth with incremental ILs did not affect the final quality of the digital impressions.
There are still errors with IOS in the FA impressions. IOS have an effect on the quality of the digital impressions, and apparently the library has not, with purely cylindrical SBs: further studies are needed to confirm this aspect.
评估口内扫描仪（IOS）和种植体库（IL）对数字化印模制作种植体支持全颌（FA）修复体的准确性的影响。
使用坐标测量机探测无牙颌上颌带有 6 个种植体模拟体和圆柱形扫描体（IPD ProCam®，马塔罗，巴塞罗那，西班牙）的石模型，以捕获参考模型（RM）。将模型安装在模型上，使用 3 种不同的 IOS（iTERO Element 5D Plus®，Align Technologies，圣何塞，CA，美国；IS 3800®，Dexis，夸克镇，宾夕法尼亚州，美国；和 i-700®，Medit，首尔，韩国）进行扫描。由经验丰富的操作人员使用每个 IOS 进行 10 次扫描，首先仅捕获咬合面，然后是颊面，最后是腭面（每次扫描不到 45 秒）。在每次扫描中，通过替换相应的 IL 文件来替换 SB 的网格，有和没有增量，以获得对网格增长的最佳校正。比较每个文件中 SB 的位置与 RM 中的位置，以评估它们之间的线性和交叉距离。最终结果是不同 IOS 的准确性，评估使用不同 IL 对印模质量的影响。
不同 IOS 扫描与 RM 之间以及不同 IOS 之间在不同部分均存在显著差异。通过增量 IL 校正网格增长并未影响 IOS 扫描的最终准确性。
在所评估的 IOS 中，在不同的扫描部分发现了不同的准确性水平，但在此使用圆柱形 SB 时，通过增量 IL 校正网格增长不会影响数字化印模的最终质量。
FA 印模中仍然存在 IOS 误差。IOS 对数字化印模的质量有影响，显然库没有影响：需要进一步研究来证实这一方面。
