TY  - JOUR
TI  - Effect of Thin-Layer Graphene Doping on The Color and Surface Hardness of Dental Ceramic
AB  - Objective: The most common cause of clinical failuresin all-ceramic dental restorations is crack formation in theveneering ceramic. The aim of this study was to determinewhether graphene doping would change the characteristics ofhardness and discoloration of the ceramic veneer surface.Material-Method: Thirty disk-shaped cores (10 mm indiameter and 0.8 mm in thickness) were prepared. Threedifferent ceramic systems, IPS Empress (E) (Ivoclar Vivadent,Schaan, Liechtenstein), IPS e.max Press (EP) (IvoclarVivadent, Schaan, Liechtenstein), and Turkom Cera (TC)(Turcom-Ceramic SDN-BHD, Kuala Lumpur, Malaysia)were tested, each with n=10. The Vickers hardness andcolor difference (ΔE) values were measured before and afterdoping with graphene. Surface analysis was performed withXRD, XPS, and SEM. The Wilcoxon signed-rank test wasperformed to compare hardness values. The Kruskal-Wallistest was performed to compare ∆E values among all groups.The Kruskal-Wallis one-way ANOVA was used for the posthoc tests after the Kruskal-Wallis test (α=0.05).Results: A significant difference was found among thegroups and the mean values of ∆E (p=0.002). According tothe post hoc test results, this difference was found betweenTC and E groups (p=0.002). Although graphene dopingincreased hardness significantly in group E, it was also foundto decrease in group TC. The mean ∆E values indicatedclinically noticeable (over the limit of 3.7) color change inall groups.Conclusions: Graphene doping may change the surfacehardness of dental ceramics depending on the content of theceramic. Similarly, depending on the content of the ceramic,it may affect its color to varying degrees. Graphene dopingincreased surface hardness only in group E but negativelyaffected the color of ceramic. Its application could be usefulin the palatal region.
AU  - kul, esra
AU  - BAYINDIR, FUNDA
DO  - 10.22312/sdusbed.634657
PY  - 2020
JO  - Süleyman Demirel Üniversitesi Sağlık Bilimleri Dergisi
VL  - 11
IS  - 1
SN  - 2146-247X
SP  - 65
EP  - 70
DB  - TRDizin
UR  - http://search/yayin/detay/409059
ER  -