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. 2023 Apr;18(2):808-813.
doi: 10.1016/j.jds.2023.01.012. Epub 2023 Jan 24.

Accuracy of digital impressions for implant-supported complete-arch prosthesis when using an auxiliary geometry device

Hale Arikan  1 , Mehmet Muhtarogullari  1 , Sema Merve Uzel  1 , Mustafa Baris Guncu  1 , Guliz Aktas  1 , Lindsay Simone Marshall  2 , Ilser Turkyilmaz  3
Affiliations

Accuracy of digital impressions for implant-supported complete-arch prosthesis when using an auxiliary geometry device

Hale Arikan et al. J Dent Sci. 2023 Apr.

Abstract

Background/purpose: Digital impressions using intraoral scanners have recently gained popularity. The aim of the present study was to evaluate the fit of full-arch screw-retained cobalt-chromium frameworks fabricated via two different digital impression methods.

Materials and methods: An edentulous resin master model with four dental implants was fabricated. Forty cobalt-chromium superstructures were fabricated and evaluated according to four groups. In Group 1, the superstructures were evaluated using an intraoral scanner to generate digital impressions. Group 2 relied on the help of an auxiliary geometric appliance in generation of digital impressions via intraoral scanner. The traditional method of splinted open-tray conventional impressions was designated for Group 3. Finally, the control group (Group 4) relied on scanning of the master model directly with a laboratory scanner. Vertical marginal discrepancy was evaluated, and data obtained were statistically analyzed.

Results: The highest mean vertical marginal gap value (80.86 ± 50.06 μm) was observed for Group 1 and statistically higher than Group 2, 3, and 4 (P < 0.05). The lowest mean vertical marginal gap value (41.98 ± 26.33 μm) was measured from Group 4 and statistically similar to Group 2 and 3 (P > 0.05).

Conclusion: It has been suggested that the use of auxiliary geometric appliances yields increased scanning accuracy. Frameworks fabricated using the traditional splinted open-tray technique were more reliable compared to those frameworks from digital impressions.

Keywords: Digital dentistry; Digital impression; Fit; Framework; Implant; Intraoral scanner.

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Conflict of interest statement

The authors have no conflicts of interest relevant to this article.

Figures

Fig. 1
Figure 1
Master model and digital impression. (A) The epoxy resin master model with four implants. (B) Full-arch digital impression of the maxilla with scan bodies in Group 1.
Fig. 2
Figure 2
Workflow in Group 2. (A) Auxiliary geometric appliance. (B) The epoxy resin master model with four implants and auxiliary geometric appliance. (C) Full-arch digital impression of the maxilla with scan bodies and auxiliary geometric appliance.
See this image and copyright information in PMC

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