Accuracy of full-arch scans using intraoral scanners

• Published in: Clinical oral investigations Vol. 18; no. 6; pp. 1687 - 1694
• Main Authors: Patzelt, Sebastian B. M., Emmanouilidi, Archontia, Stampf, Susanne, Strub, Joerg R., Att, Wael
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-07-2014; Springer Nature B.V
• Subjects: Analysis of Variance; Dental Arch - diagnostic imaging; Dentistry; Humans; Maxilla - diagnostic imaging; Medicine; Original Article; Radiography; Digital impression; Intraoral scanner; Precision of intraoral scanners; Full-arch scan; Accuracy of intraoral scanners; Trueness of intraoral scanners
• ISSN: 1432-6981; 1436-3771
• DOI: 10.1007/s00784-013-1132-y

Objectives
This study aimed to evaluate the accuracy of intraoral scanners in full-arch scans.
Materials and methods
A representative model with 14 prepared abutments was digitized using an industrial scanner (reference scanner) as well as four intraoral scanners (iTero, CEREC AC Bluecam, Lava C.O.S., and Zfx IntraScan). Datasets obtained from different scans were loaded into 3D evaluation software, superimposed, and compared for accuracy. One-way analysis of variance (ANOVA) was implemented to compute differences within groups (precision) as well as comparisons with the reference scan (trueness). A level of statistical significance of
p
 < 0.05 was set.
Results
Mean trueness values ranged from 38 to 332.9 μm. Data analysis yielded statistically significant differences between CEREC AC Bluecam and other scanners as well as between Zfx IntraScan and Lava C.O.S. Mean precision values ranged from 37.9 to 99.1 μm. Statistically significant differences were found between CEREC AC Bluecam and Lava C.O.S., CEREC AC Bluecam and iTero, Zfx Intra Scan and Lava C.O.S., and Zfx Intra Scan and iTero (
p
 < 0.05).
Conclusions
Except for one intraoral scanner system, all tested systems showed a comparable level of accuracy for full-arch scans of prepared teeth. Further studies are needed to validate the accuracy of these scanners under clinical conditions.
Clinical relevance
Despite excellent accuracy in single-unit scans having been demonstrated, little is known about the accuracy of intraoral scanners in simultaneous scans of multiple abutments. Although most of the tested scanners showed comparable values, the results suggest that the inaccuracies of the obtained datasets may contribute to inaccuracies in the final restorations.