Articles Tập 67 Số CĐ15 25/09/2026

ACCURACY OF INTRAORAL PHOTOGRAMMETRY IN DIGITAL IMPRESSIONS FOR FULL-ARCH IMPLANT REHABILITATION: AN IN VITRO STUDY

Nguyen Thi Khanh Ha, Tran Duy Quan, Phi Thi Hung, Nguyen Van Ti, Nguyen Thien Nhan, Nguyen Thi Le Quyen, Nguyen Tran Bao Linh, Bui Ngoc Huyen Trang, Truong Nhut Khue
DOI: 10.52163/yhc.v67iCD15.6793
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Abstract

Objectives: To evaluate the accuracy of intraoral photogrammetry in digital impressions for full-arch implant rehabilitation.

Subjects and methods: An in vitro study was conducted on a monolithic 3D-printed edentulous maxillary model equipped with 4 digital analogs. A reference scan was obtained with a 3Shape D2000 laboratory scanner, and 10 test scans were acquired using a Shining 3D Aoralscan Elite intraoral scanner with coded scan body accessories. The *.stl files were superimposed and analyzed using CloudCompare software to calculate linear deviations (Δx, Δy, Δz, ΔEUC) and angular deviations. Trueness (n = 10) and precision (n = 45) were evaluated and compared against reference thresholds using a one-sample t-test with a significance level of p < 0.05.

Results: Regarding trueness, the mean overall linear deviation (ΔEUC) was 87.71 ± 3.42 µm, and the angular deviation was 0.59 ± 0.00 degrees. Regarding precision, the ΔEUC was 8.25 ± 3.94 µm, and the angular deviation was 0.05 ± 0.02 degrees. Deviations in the x and y axes, ΔEUC, and angular deviations were significantly lower than the clinically acceptable thresholds (p < 0.001). The z-axis deviation (56.42 ± 4.54 μm) exceeded the 50 μm threshold (p = 0.002).

Conclusion: This technology demonstrates high accuracy in digital impressions for full-arch implant rehabilitation. Most deviations were within clinically acceptable limits, except for the z-axis deviation, which exceeded the reference threshold. Further studies are needed to standardize the protocol and improve clinical applicability.

Keywords
Accuracy, intraoral photogrammetry, digital impression, full-arch implant rehabilitation.
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