4.7 Article

In Vitro Accuracy of Digital and Conventional Impressions for Full-Arch Implant-Supported Prostheses

Journal

JOURNAL OF CLINICAL MEDICINE
Volume 11, Issue 3, Pages -

Publisher

MDPI
DOI: 10.3390/jcm11030594

Keywords

intraoral scanning; accuracy; full-arch implant impression; digital impression; edentulous

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The aim of this study was to evaluate the accuracy of full-arch digital impressions compared to conventional impressions. The results showed that depending on the intra-oral scanner and software, digital impressions can be as accurate as conventional impressions. Impressions taken at the abutment level were found to be more accurate compared to implant level impressions.
The aim of this study was to evaluate the accuracy of full-arch digital impressions when compared to conventional impressions, when performed on the abutment or implant level. Methods: One resin cast with six implants and another cast with six abutments were scanned with Primescan v5.1 (PS51), Primescan v5.2 (PS52), Trios 3 (T3), and Trios 4 (T4). Additionally, conventional impressions (A) were made, poured in gypsum, and digitized using a lab scanner (IScan D104i). A coordinate machine (Atos, GOM, Braunschweig, Germany) was used to generate the reference scan of both casts. For all scans, the position of the implants was calculated and matched with the reference scan. Angular and coronal measurements per implant were considered for trueness and precision. Results: For the implant-level model, PS52 performed significantly better in terms of trueness and precision compared to all other impressions, except for the angular trueness of A (p = 0.072) and the coronal trueness of PS51 (p = 1.000). For the abutment-level model, PS52 also performed significantly better than all other impressions, except for the coronal trueness and precision of A (p = 1.000). Conclusions: Digital impressions for full-arch implant supported prostheses can be as accurate as conventional impressions, depending on the intra-oral scanner and software. Overall, abutment level impressions were more accurate compared to implant level impressions.

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