In-vitro evaluation of wear characteristics, microhardness and color stability of dental restorative CAD/CAM materials

Dent Mater J. 2024 Jan 30;43(1):74-83. doi: 10.4012/dmj.2023-071. Epub 2023 Dec 8.


The aim of this study was to demonstrate the vertical and volumetric wear characteristics of CAD/CAM materials. The microhardness and color stability were evaluated. A polymer infiltrated ceramic network CAD/CAM block, resin nanoceramic CAD/CAM blocks, a resin composite, and enamel tissue were investigated. Samples were loaded in a chewing simulator. Other samples were aged and immersed in coffee. Color change was evaluated using the digital image analysis and a spectrophotometer. The data were analyzed using Kolmogorov-Smirnov, Kruskal Wallis, Mann Whitney U, Friedman, Spearman's rho tests (p<0.05). The lowest level of wear was obtained in enamel tissue group 0.20 (Q1:0.14; Q3:0.27μm). Resin composite group 2.48 (Q1:2.12; Q3:2.92) showed lower level of discoloration. No agreement was obtained between the digital image analysis and spectrophotometer data (Spearman's rho -0.314, p=0.014). Similar wear rate to the natural enamel tissue was obtained for Vita Enamic. Digital image analysis was considered a promising technique for monitoring the color change.

Keywords: CAD/CAM; Composite; Discoloration; Microhardness; Wear.

MeSH terms

  • Ceramics*
  • Color
  • Composite Resins
  • Computer-Aided Design
  • Dental Materials
  • Dental Porcelain*
  • Materials Testing
  • Polymers
  • Surface Properties


  • Dental Porcelain
  • Composite Resins
  • Polymers
  • Dental Materials