Further clinical studies are needed to validate this new method of postoperative evaluation. The IOS utilization to evaluate the position of dental implants is a radiation-free and reproducible method, with the advantage of not generating metal artifacts. There was a statistically significant difference IN the scanned measures compared to CBCT as the standard, but the differences may not be clinically significant. T-test showed a statistically significant difference when the 4 means were compared to zero value, represented by the CBCT ( P < .0001). The results showed Xc and Xa deviation means of 0.14 ± 0.09 mm and 0.12 ± 0.12 mm, respectively. Bland-Altman and a paired t-test were applied to verify the reproducibility between measurements and a t-test for a mean was applied to compare the measurements with zero value. The following measures were analyzed: radial deviations at the shoulder (Xc) and at the apex of the implants (Xa), height deviation (Xh) and axial deviation. The accuracy of IOS was evaluated by the metric analyses of deviations between the position of the implants projected by the IOS versus the detected tomographically, in which CBCT served as the gold standard, using a free software for digital planning (Bluesky 4 - Grayslake, IL, USA). Then, the 3D scan files in STL (Standard Tessellation Language) format were superimposed on the DICOM (Digital Imaging and Communications in Medicine) images of the tomographic mandibles. All prototypes were also submitted to CBCT. Four scanbodies were attached to the implants, and a scanning of each mandible was acquired using an intraoral scanner (CS 3600). One hundred twenty implants were installed in 30 edentulous polyurethane jaws, 4 dental implants in each prototype. Using polyurethane jaw models, the purpose of this in-vitro study was to measure and compare implant positions determined by IOS and cone-bean computed tomography (CBCT). Intraoral scanning (IOS) may be a suitable alternative to using radiographic imaging to verify implant position. The position of dental implants is generally verified through imaging exams, even though its use exposes patients to radiation.
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