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Accuracy of Digital Versus Conventional Full-arch Implant Impressions
Thursday, March 1 / 12:20-12:30pm / Monitor 2

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Background and Aim:

No data exist on the accuracy of digital implant impressions for completely edentulous jaws. Therefore, a study assessing the performance and accuracy of digital impressions compared to conventional impressions for completely edentulous patients would contribute to clinically validate this new cutting-edge technology.

The purposes of the present study were: (1) to test whether or not digital implant impressions are more accurate than conventional implant impressions in completely edentulous patients and, (2) to test whether or not the implant angulation or the implant connection type (internal-connection vs abutment level-connection) affect the accuracy of implant impressions and casts, in completely edentulous patients. The null hypothesis of this investigation was that digital impressions have similar accuracy as conventional implant impressions. 

Study design and workflow:

A stone cast of an edentulous mandible with 5 implants was fabricated to serve as master cast (control) at both implant and abutment-level. Digital impressions (n=10) were taken with 2 intraoral scanners (Omnicam & True Definition) after connecting plastic scan bodies for the digital impressions.  The conventional impression technique was used to fabricate the conventional group of stone casts (n=10). The stone casts were scanned with the same intraoral scanner and digitized. The standard tessellation language (STL) datasets from the 3 groups of digital and conventional impressions were superimposed with STL dataset from the master cast to assess the 3-D (global) deviations. 


1.Digital full-arch implant impressions using True Definition scanner and Omnicam were significantly more accurate than the conventional impressions with the splinted open-tray technique.
2.The digital impressions with the True Definition scanner had significantly less 3-D deviations when compared with the Omnicam.


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