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. 2025 Jan 27;29(1):92.
doi: 10.1007/s00784-025-06154-2.

Accuracy of full arch scans performed with nine different scanning patterns- an in vitro study

Kerstin Schlögl  1 , Jan-Frederik Güth  2 , Tobias Graf  2 , Christine Keul  3
Affiliations

Accuracy of full arch scans performed with nine different scanning patterns- an in vitro study

Kerstin Schlögl et al. Clin Oral Investig. .

Erratum in

Abstract

Objective: Evaluation of the accuracy of direct digitization of maxillary scans depending on the scanning strategy.

Materials and methods: A maxillary model with a metal bar as a reference structure fixed between the second molars was digitized using the CEREC Primescan AC scanner (N = 225 scans). Nine scanning strategies were selected (n = 25 scans per strategy), differing in scan area segmentation (F = full jaw, H = half jaw, S = sextant) and scan movement pattern (L = linear, Z = zig-zag, C = combined). Trueness was assessed by evaluating linear differences in the X, Y, and Z axes and angular deviations (α axial, α coronal, α total) compared to a reference dataset. Statistical differences were analyzed using Kruskal-Wallis and Mann-Whitney U tests (p<0.017). Precision was analyzed by the standard deviation of linear and angular aberrations (ISO 5725-1) (p < 0.05).

Results: Strategy FL showed significantly higher trueness and precision than FZ for VE (p = 0.009), VE(y) (p = 0.010), αoverall (p = 0.004), and αaxial (p = 0.002). Strategy FC demonstrated significantly better trueness than FZ for VE (p = 0.007), αoverall (p = 0.010), and αcoronal (p = 0.013). For scan segmentation, FL showed better trueness for VE(y) (p = 0.001) and αaxial (p < 0.001) than HL. Strategy HL showed better trueness for VE(z) than for FL and SL (p = 0.001, p = 0.002). The scanning patterns FL, FC, and HL exhibited the best performance for trueness and precision.

Conclusions: Scanning motion and segmentation have a significant impact on the trueness and precision of full-arch scans.

Clinical relevance: The scanning strategy is decisive in enhancing the clinical workflow and the accuracy of full-arch scans.

Keywords: Accuracy; Full-arch digitization; Intraoral scanner; Scanning strategies.

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Conflict of interest statement

Declarations. Ethical approval: This article does not contain any studies with human participants or animals performed by any of the authors. Competing interests: The authors declare no competing interests.

Figures

Fig. 1
Fig. 1
Visualization of the scanning strategies
Fig. 2
Fig. 2
Construction of the surfaces in contact feature mode
Fig. 3
Fig. 3
Construction of the surfaces in the first quadrant
Fig. 4
Fig. 4
Statistical analysis of linear deviations
Fig. 5
Fig. 5
Statistical analysis of angular deviations
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