Accuracy of intraoral scans: An in vivo study of different scanning devices

Statement of problem. The accuracy of intraoral scanners is a prerequisite for the fabrication of dental restorations in computer-aided design and computer-aided manufacturing (CAD-CAM) dentistry. While the precision of intraoral scanners has been investigated in vitro, clinical data on the accuracy of intraoral scanning (IOS) are limited. Purpose. The purpose of this clinical study was to determine the accuracy of intraoral scanning with different devices compared with extraoral scanning. Material and methods. An experimental appliance was fabricated for 11 participants and then scanned intraorally and extraorally with 3 different intraoral scanners and a reference scanner. Intraoral and extraoral scans were subdivided into complete-arch and short-span scans and compared with the reference scan to assess trueness. Repeated scans in each group were assessed for precision. Results. Precision and trueness were higher for extraoral scans compared with intraoral scans, except for complete-arch scans with 1 intraoral scanner. The median precision of short-span scans was higher (extraoral: 22 to 29 gm, intraoral: 23 to 43 gm) compared with complete-arch scans (extraoral: 81 to 165 gm, intraoral: 80 to 198 gm). The median trueness of short-span scans (extraoral: 28 to 40 gm, intraoral: 38 to 47 gm) was higher than that of complete-arch scans (extraoral: 118 to 581 gm, intraoral: 147 to 433 gm) for intraoral and extraoral scanning. Conclusions. Intraoral conditions negatively influenced the accuracy of the scanning devices, which was also reduced for the complete-arch scans. (J Prosthet Dent 2022;128:1303-9)

Automated summary

The accuracy of intraoral scanners is crucial for computer-aided design and computer-aided manufacturing (CAD-CAM) dentistry. This clinical study compared the accuracy of intraoral scanning with different devices to extraoral scanning. The results showed that extraoral scans had higher precision and trueness compared to intraoral scans, except for complete-arch scans with one specific intraoral scanner. Short-span scans had higher precision and trueness compared to complete-arch scans.