Abstract
Objective:. This in-vitro study aimed to evaluate the surface roughness (Ra) and color stability of novel monolithic CAD-CAM materials after thermomechanical aging.
Methods: Forty specimens were obtained from 4 different materials (a resilient ceramic (C), ceramic-reinforced PEEK (BH), lithium disilicate glass ceramic (EX), and a resin based composites (B) (n=10). Initial Ra and color coordinates were recorded. All specimens were than subjected to thermomechanical aging. Ra and color coordinate measurements were repeated. CIEDE2000 formula was used to calculate the color changes (ΔE00). Kruskal-Wallis and Dunn tests were used to analyze data, while the effect of aging on Ra was analyzed with Wilcoxon test (α=.05).
Results: Regardless of aging, BH showed higher Ra than EX (P.05). Ra of ceramic-reinforced PEEK was above clinical threshold, regardless of thermomechanical aging.
Conclusion: Thermomechanical aging caused a color change that was perceptible for all the materials tested, while it was also unacceptable for ceramic-reinforced PEEK.
Funder
Scientific Research Project Council of Biruni University
Subject
General Materials Science
Reference50 articles.
1. Al Amri MD, Labban N, Alhijji S, Alamri H, Iskandar M, Platt JA. In vitro evaluation of translucency and color stability of cad/cam polymer-infiltrated ceramic materials after accelerated aging. J Prosthodont. 2021;30:318-328. DOI: 10.1111/jopr.13239.
2. Davidowitz G, Kotick PG. The use of CAD/CAM in dentistry. Dent Clin North Am. 2011;55:559-570. DOI: 10.1016/j.cden.2011.02.011.
3. Diken Turksayar AA, Hisarbeyli D, Seçkin Kelten Ö, Bulucu NB. Wear behavior of current computer-aided design and computer-aided manufacturing composites and reinforced high performance polymers: An in vitro study. J Esthet Restor Dent. 2021;34(3):527-553. DOI: 10.1111/jerd.12828.
4. Ahmed DR, Abbas MM, El-Badrawy WA, Eldwakhly EA. Wear and surface roughness of novel computer-assisted-design/computer-assisted manufacturing restorative materials. Mater Express. 2021;11:403-411. DOI: 10.1166/mex.2021.1917.
5. Stawarczyk B, Özcan M, Schmutz F, Trottmann A, Roos M, Hämmerle CHF. Two-body wear of monolithic, veneered and glazed zirconia and their corresponding enamel antagonists. Acta Odontol Scand. 2013;71:102-112. DOI: 10.3109/00016357.2011.654248.