Accuracy of the Calibrated Framework for Intra Oral Full Arch Scan (A Cross-over Study)

This crossover clinical trial aims to compare the accuracy of conventional splinted open-tray implant impressions with intraoral digital scanning using a calibrated framework in completely edentulous patients rehabilitated with full-arch implant-supported prostheses. Accurate transfer of implant positions is essential for achieving a passive fit of the prosthetic framework and minimizing biological and mechanical complications.

Twenty healthy completely edentulous patients requiring full-arch implant rehabilitation will be enrolled. Each participant will undergo both conventional and digital impression techniques following implant placement, allowing direct within-subject comparison. The conventional technique consists of a verified splinted open-tray impression, while the digital technique uses an intraoral scanner in combination with a calibrated stock framework.

The accuracy of the two impression techniques will be evaluated by superimposing the resulting STL files using Geomagic Control X software. Linear deviations in the x-, y-, and z-axes, angular deviations, and global deviations will be measured and compared. The findings of this study are expected to provide clinical evidence regarding the accuracy of calibrated framework-assisted intraoral scanning compared with the conventional impression technique for full-arch implant rehabilitation.