Accuracy of Standard and Geometric Pattern-Assisted Digital Scanning for Full-Arch Implant Prosthesis Frameworks

A full-arch digital impression is obtained using a high-precision intraoral scanner. Scan bodies are placed on multi-unit abutments and scanned without the use of external reference markers or geometric aids. The scan follows the manufacturer-recommended scanning path to capture the complete arch. This serves as a baseline digital technique for comparison with geometric pattern-assisted scanning.

The same intraoral scanner is used, but with an additional geometric reference pattern introduced in the scanning field to improve stitching accuracy and alignment of the digital scan.

A physical impression is taken using open-tray impression copings splinted with DuraLay resin and polyvinyl siloxane (PVS) material in a custom tray, according to conventional protocols for full-arch implant prostheses.