Resources > Scientific Highlights

Do you trust your scanner with full arch implant prostheses?

20 Mar 2020

Which is the best way to take an impression of full arch implants? Is the conventional way still the safest way to go? Maybe it’s time to reconsider, according to a recently published study from Eastman Institute at the University of Rochester, NY.

In this study, sixteen patients received a full arch fixed prosthesis in the maxilla,  supported by 4 -6 implants. The final impression was taken with both conventional way and an intraoral scanner. The stone casts where then scanned with an extraoral lab scanner and compared with the STL files from the intraoral scanners with the help of specialized software. What did they find? The average 3D deviation between virtual casts from intraoral full arch digital scans and conventional stone casts was found to 162 ± 77 µm. The difference appeared to increase with the number of implants from 139 ± 56 µm in the 4-implant group, to 146 ± 90 µm in the 5 and 185 ± 81 µm in the  6-implant group, although this was not a statistically significant difference. Conclusion? The authors believe that  full-arch intraoral scans and a complete digital workflow in the fabrication of maxillary fixed complete dentures may be now clinically feasible.