Abstract
.Purpose: In dental offices, there is a trend replacing conventional silicone impressions and plaster cast models by imaging data of intraoral scanners to map the denture and surrounding tissues. The aim of the study is the analysis of the accuracy of selected commercially available scanners. The accuracy is considered as the main drawback in comparison to the conventional approach.Approach: We evaluated the reproduction performance of five optical scanners by a direct comparison with high-resolution hard x-ray computed tomography data, all obtained from a polyetheretherketone model with similarity to a full-arch upper jaw.Results: Using the software GOM Inspect (GOM GmbH, Braunschweig, Germany), we could classify the intraoral scanners into two groups. The more accurate instruments gave rise to the following precision values: (TRIOS® 3, 3shape, Copenhagen, Denmark), (CS 3600, Carestream, Atlanta, Georgia), and (3M™ True Definition Scanner, 3M ESPE, St. Paul, Minnesota). The less precise systems yielded (Medit i500, Medit corp., Seongbuk-gu, South Korea) and (Emerald™, Planmeca Oy, Helsinki, Finland).Conclusions: The selected scanners are suitable for single crowns, small bridges, and separate quadrants prostheses. Scanners based on triangulation are hardly appropriate for full-arch prostheses. Besides precision, however, the choice of the scanner depends on scanning time, intraoral-camera size, and the user’s learning curve. The developed protocol, which includes three-dimensional (3D) imaging and advanced computational tools for the registration with the design data, will be increasingly used in geometrical metrology by nondestructive procedures to perform dimensional measurements with micrometer precision and is capable for detailed 3D geometrical models reconstruction.
Highlights
An increasing number of dental treatments require the highly precise impression of the oral situation, and the quality of the treatment and the related success of the therapy depend on the correctly performed impression
The selected scanners are suitable for single crowns, small bridges, and separate quadrants prostheses
Scanners based on triangulation are hardly appropriate for full-arch prostheses
Summary
An increasing number of dental treatments require the highly precise impression of the oral situation, and the quality of the treatment and the related success of the therapy depend on the correctly performed impression. No cast is needed, but depending on the procedure, a physical model with the necessary accuracy requirements has to be produced These models are mostly three-dimensionally printed using stereolithography apparatuses (SLA), and they feature clinically acceptable accuracy.[3] Intraoral scanners (IOS) are gaining importance in dental offices, and so they are responsible for a paradigm shift in prosthetic dentistry.[2,4] The latest generation of video-based systems (IOS) seems to be more accurate, faster, and more efficient in clinical application than previously employed devices, and they are even suitable for less experienced practitioners, because of their simplified handling.[1,5,6] IOSs offer advantages compared to conventional impressions, and digital impressions are time-efficient and much more comfortable for patients. Patients suffering from the gag reflex benefit.[7]
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