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Accuracy of commercial intraoral scanners

DOI: 10.1117/1.JMI.8.3.035501 DOI Help

Authors: Mattia Sacher (University of Basel; Praxis-Team St. Margarethen) , Georg Schulz (University of Basel) , Hans Deyhle (University of Basel; Diamond Light Source) , Kurt Jäger (University of Basel; Argodentis Zahnmedizin Aarburg) , Bert Muller (University of Basel)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Medical Imaging , VOL 8

State: Published (Approved)
Published: May 2021

Open Access Open Access

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: 35  μm (TRIOS® 3, 3shape, Copenhagen, Denmark), 43  μm (CS 3600, Carestream, Atlanta, Georgia), and 46  μm (3M™ True Definition Scanner, 3M ESPE, St. Paul, Minnesota). The less precise systems yielded 93  μm (Medit i500, Medit corp., Seongbuk-gu, South Korea) and 97  μm (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.

Journal Keywords: three-dimensional accuracy evaluation; micro computed tomography; stereolithography printer; full-arch scanning; registration; deviation field

Subject Areas: Biology and Bio-materials


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035501_1.pdf

Discipline Tags:

Dentistry Health & Wellbeing Life Sciences & Biotech

Technical Tags: