Purpose
The purpose of this in vitro study was to compare the accuracy of 2 intraoral scanners, TRIOS 3 (TR) and CEREC Omnicam (OC). Accuracy was assessed from changes to reference distances defined along the complete arch of a reference cast including 3 precision balls and 3 prepared teeth. The local accuracy (trueness and precision) of the scanned surface of each prepared tooth was also assessed.
Results
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The scanner did not have a statistically significant effect (P=.138) for distance, and the different distances differed significantly from each other (P<.001).
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Both scanners provided results acceptable for the fabrication of inlays and short-span FPDs.
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A complete-crown scan was more accurate than an inlay scan (P<.001).
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Accuracy and precision were better for TR than for OC (P<.001).
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The anterior teeth generally scanned more accurately than the posterior teeth in a full-arch scan.
Conclusions[^32]
- Key Finding: Complete-arch scans cannot yet be recommended for the fabrication of long-span FPDs due to significant discrepancies across the arch (maximum discrepancies of 192.5 to 294.6 μm).