Evaluation of thickness of CAD/CAM fabricated zirconia cores by digital microscope

Abstract

Despite several advantages of digitalized workflow, researchers have noted discrepancies in the precision and trueness. This study investigated the accuracy in the final thickness of Zirconia (Zr) cores fabricated by five CAD/CAM systems. Standardized manufacturing of the cores with 1 mm thickness were carried out. Cores were then sectioned into two halves and measurement made with Digital Microscope at 5 points in micrometers. Overall, mean thickness for the groups was 1048.81 $\pm$ 94.01, which was 48 $\mu$ m higher than the thickness programmed in the software. Anova showed a statistically significant difference between the groups ( $p=$ 0.000). Presence of variations in the thickness and 5 measurement points for the CAD/CAM systems investigated was found. No significant difference was observed and the thickness of the cores were within acceptable level.