Purpose: To evaluate the trueness of five intraoral scanners on a fully edentulous model with seven implants. Materials and Methods: The study model was created from gypsum with seven implant analogs that were placed with 2-mm gingival height and a 0-degree angle at tooth sites 47, 45, 43, 31, 33, 35, and 37 (FDI system). The study model was scanned 10 times (n = 10) with five intraoral scanners (CS 3600, Emerald S, Primescan, Trios 3, and Trios 4). The study model was digitized with a high-resolution industrial desktop scanner, and the data were imported into reverse-engineering software to be used as the reference model. The trueness assessment was performed digitally with superimposition using the software. Linear measurements were calculated as the differences between the centers of the scan bodies on the study models vs the reference model. Volumetric deviations were calculated with root mean square values. Data obtained in the study were analyzed statistically using one-way analysis of variance and Tukey tests. A value of P < .05 was accepted as statistically significant. Results: In linear measurements, Trios 4 showed the best trueness results, followed by Trios 3, Emerald S, Primescan, and CS 3600. Trios 4 showed statistically higher trueness results than CS 3600 (P = .029). However, no statistically significant differences were found between groups in volumetric measurements (P < .05). Conclusions: All of the intraoral scanners used in the study showed favorable deviation values for an edentulous model with seven implants. Trios 4 showed the best trueness values. The latest generation of intraoral scanners can be used in full-arch implant impressions.
