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. 2022 Oct 7;66(4):538-545.
doi: 10.2186/jpr.JPR_D_21_00100. Epub 2021 Dec 7.

In-vitro accuracy of complete arch scans of the fully dentate and the partially edentulous maxilla

Moritz Waldecker  1 , Wolfgang Bömicke  1 , Rouven Behnisch  2 , Peter Rammelsberg  1 , Stefan Rues  1
Affiliations
Free article

In-vitro accuracy of complete arch scans of the fully dentate and the partially edentulous maxilla

Moritz Waldecker et al. J Prosthodont Res. .
Free article

Abstract

Purpose: This in-vitro study aimed to compare the accuracy of complete arch scans (CAS) of a fully dentate (FD) and a partially edentulous (PE) maxillary model. Three intraoral scanning systems were used: Omnicam AC (OC), TRIOS 4 (TR), and Primescan (PS).

Methods: Each intraoral scanner was used to take 30 scans each of two clinical scenarios (FD and PE) simulated by a reference model. The PE model simulated a maxilla with six prepared teeth to accommodate a jaw-spanning fixed partial denture (FPD). The missing teeth were then added to create an FD model. Five ceramic precision balls (ball centers P1-P5) mounted on metal pins were welded to the metal base on the buccal side of the dental arch. These were later used to determine dimensional (given by each 2 ball centers) and angular changes (given by each 3 or 4 ball centers) between the reference model (digitized with high precision before the tests) and the intraoral scans. Data were statistically analyzed using a type II ANOVA.

Results: The maximum mean absolute distance deviations were as follows. OC: 147 µm (FD) and 139 µm (PE). TR: 133 µm (FD) and 136 µm (PE). PS: 87 µm (FD) and 80 µm (PE). The scanning system used had a significant effect on distance deviations (p < 0.027) and CAS scanning time (p < 0.001). Dental status had no clear effect on distance deviations but did significantly affect angular changes (p < 0.001) and scanning time (p < 0.001).

Conclusion: The manufacture of jaw-spanning FPDs based on a CAS cannot yet be recommended.

Keywords: Complete arch scan; Digital impression; Fully dentate; Intraoral scan; Partially edentulous.

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