Korean J Dent Mater.  2018 Dec;45(4):233-242. 10.14815/kjdm.2018.45.4.233.

Effect of resin cement color on the color of commercially available zirconia crown

Affiliations
  • 1Department of Dental Biomaterials Science, Dental Research Institute and BK21 PLUS, School of Dentistry, Seoul National University, Korea. rhee1213@snu.ac.kr

Abstract

The purpose of this study is to evaluate the effect of resin cement color on the color of commercially available zirconia crown. The zirconia and resin cements used for the experiment were NuSmile® ZR Zirconia LT Shade (LT), RelyXâ„¢ U200 TR, A2, and A3O (TR, A2, A3O). The disks of zirconia and resin cements with diameters of 5 mm and thicknesses of 1 mm were prepared. Five disks were made for each specimen. The CIE L*a*b* values of zirconia, resin cements and the combinations thereof were measured on black and white backgrounds, respectively, using a spectrophotometer. The color effect of resin cement on the color of the zirconia crown was evaluated by calculating translucency parameter (TP), contrast ratio (CR), and color differences (ΔĖ(ab)) based on the measured CIE L*a*b* values. The statistical significances were verified by one-way ANOVA and the Tukey-multiple comparisons tests. As a result, the TP and CR values were decreased (p < 0.05) and increased, respectively, in the combination of zirconia and resin cement disks compared to zirconia disk per se. When using the black background, the ΔĖ(ab) values between zirconia and the combination of the zirconia and three resin cement disks were imperceptible level. The A3O showed the lowest ΔĖ(ab) value among three resin cements. When using the white background, the ΔĖ(ab) values between zirconia and the combination of zirconia and TR resin cement (LT/TR) disks showed acceptable level. However, the ΔĖ(ab) values between zirconia and the combination of zirconia and A2 resin cement (LT/A2) disks showed unacceptable level. Meanwhile, the ΔĖ(ab) values between zirconia and the combination of zirconia and A3O resin cement (LT/A3O) disks showed perceptible but acceptable level. Within the limits of this study, the colors of resin cements did not cause unacceptable color changes of zirconia except the combination of LT/A2 on the white background. The resin cement that gave the least color changes to zirconia was A3O. This means that the resin cement A3O is recommended to use for minimizing color changes when cementing commercially available zirconia crown to tooth.

Keyword

Color difference; Contrast ratio; Resin cement; Translucency parameter; Zirconia

MeSH Terms

Crowns*
Resin Cements*
Tooth
Resin Cements
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