Accuracy of 3 Intraoral and 1 Extraoral Digital Scanning Systems for Multiple Laminate Veneer Preparations: An In Vitro Study

BACKGROUND Digital impressions using intraoral and extraoral scanners have overcome the conventional impression limitations such as dimensional inaccuracies, difficulties in tray selection, material-related problems, and impression storage difficulties. Despite technological advances, achieving100% accuracy remains challenging due to scanner quality, image capture size, and file transfer errors. For multiple ceramic laminate veneers, marginal adaptation is crucial for success, requiring optimal tooth-veneer contact fit to maximize restoration longevity. MATERIAL AND METHODS A maxillary typodont master model was prepared for multiple ceramic laminate veneers for teeth #11, #12, and #13. The master model was scanned with 3 different intraoral scanners (Trios, Medit i700 and iTero) and 1 extraoral benchtop scanner (3Shape). The STL scan files were superimposed with the master model using a best-fit alignment algorithm to measure the linear deviations at 6 specific surface locations and compared the scanning accuracy of the 3 different intraoral scanners and 1 extraoral benchtop scanner on multiple teeth prepared for laminate veneers. RESULTS The Trios intraoral scanner had significantly lower deviations across all measured surfaces, followed by the Medit i700 intraoral scanner and the 3Shape extraoral benchtop scanner, while the iTero intraoral scanner consistently showed the highest deviations at most measurement points. CONCLUSIONS The Trios intraoral scanner was the most accurate, followed by the Medit i700 intraoral scanner, compared to the iTero intraoral scanner and 3Shape extraoral benchtop scanner.