Effect of thin-layer graphene doping on the color and surface hardness of dental ceramics

Authors : Esra KUL, Funda BAYINDIR

Pages : 65-70

Doi:10.22312/sdusbed.634657

View : 25 | Download : 11

Publication Date : 2020-03-03

Article Type : Research Paper

Abstract :Abstract Objective:  The most common cause of clinical failures in all-ceramic dental restorations is crack formation in the veneering ceramic. The aim of this study was to determine whether graphene doping would change the characteristics of hardness and discoloration of the ceramic veneer surface. Material-Method: Thirty disk-shaped cores insert ignore into journalissuearticles values(10 mm in diameter and 0.8 mm in thickness); were prepared. Three different ceramic systems, IPS Empress insert ignore into journalissuearticles values(E); insert ignore into journalissuearticles values(Ivoclar Vivadent, Schaan, Liechtenstein);, IPS e.max Press insert ignore into journalissuearticles values(EP); insert ignore into journalissuearticles values( Ivoclar Vivadent, Schaan, Liechtenstein);, and Turkom Cera insert ignore into journalissuearticles values(TC);  insert ignore into journalissuearticles values(Turcom-Ceramic SDN-BHD, Kuala Lumpur, Malaysia);  were tested, each with n=8. The Vickers hardness and color difference insert ignore into journalissuearticles values(ΔE); values were measured before and after doping with graphene. Surface analysis was performed with XRD, XPS, and SEM. The Wilcoxon signed-rank test was performed to compare hardness values. The Kruskal-Wallis test was performed to compare ∆E values among all groups. The Kruskal-Wallis one-way ANOVA was used for the post hoc tests after the Kruskal-Wallis test insert ignore into journalissuearticles values(α=.05);. Results:  A significant difference was found among the groups and the mean values of ∆E insert ignore into journalissuearticles values(p = 0.002);. According to the post hoc test results, this difference was found between TC and E groups insert ignore into journalissuearticles values(p = 0.002);. Although graphene doping increased hardness significantly in group E, it was also found to decrease in group TC. The mean ∆E values indicated clinically noticeable insert ignore into journalissuearticles values(over the limit of 3.7); color change in all groups. Conclusions:  Graphene doping may change the surface hardness of dental ceramics depending on the content of the ceramic. Similarly, depending on the content of the ceramic, it may affect its color to varying degrees. Graphene doping increased surface hardness only in group E but negatively affected the color of ceramic. Its application could be useful in the palatal region.  Keywords:  Dental ceramics; Color; Doping; Hardness
Keywords : Ceramics,  Color, Doping,  Hardness