9. Accuracy of digital impressions of dental post at different lengths - an in-vitro study
Main Article Content
Abstract
This study evaluated the accuracy (including trueness and precision) of the intraoral scanner (IOS) digital impressions of posts at different lengths. In-vitro testing was performed on three 3D designed and printed dental post models with depths of 8, 9 and 10mm, respectively. The 3D printed models were scanned using IOS Trios 3 and compared with the reference 3D design model. The images from the scanner were superimposed and the differences from the reference image were calculated at 3 locations (1/3 cervical, 1/3 middle 1/3 and 1/3 apical) corresponding to 3 different post depths. The accuracy of the IOS images decreased with the length of the post. The 8mm posts had the highest accuracy in all 3 location, while the 9 and 10mm groups had a significant decrease in trueness in the apical third. The precision between the scans showed that there was no difference of 8 and 9mm groups, however, at the apical third in the 10mm group, the precision was different from the others. The post length affects the accuracy of the Trios 3 scanner, causing a risk of reducing the fit of the post made by CAD/CAM method and the 8mm lenght is the maximum recommended implant length to ensure the accuracy of the scan data.
Article Details
Keywords
Accuracy, post, digital dentistry, intraoral scanner, CAD/CAM
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