Accuracy of full-arch scans using intraoral scanners
Abstract
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.
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