Evaluation of the effect of different core substrates on the accuracy of intraoral scanners

Abstract Background The aim of this study was to determine if different types of core substrates have any effect on the trueness and precision of digital intraoral impressions. Material and Methods A customized typodont with four similar cores of natural dentine, composite, metal (Ni‐Cr), and zirconia in the position of premolars was fabricated. The study model was scanned five times with two types of intraoral scanners (Carestream 3600 and 3Shape Trios 3), and a reference standard scan was obtained using a laboratory scanner (3shape D1000). A metrology software (Geomagic X) was used to align the data of experimental scans and the reference scan to determine deviation values (trueness). Precision values were calculated with random superimposition in each intraoral scanner group. The Kruskal–Wallis test was used to compare differences between different substrates, and the Mann–Whitney test was used to compare the average values between the two scanners. Results Trios 3 was found to be significantly truer and more precise than Carestream 3600 (p value = .005,