J Adv Prosthodont.  2014 Oct;6(5):415-422. 10.4047/jap.2014.6.5.415.

Comparison of the translucency of shaded zirconia all-ceramic systems

• Kurtulmus-Yilmaz S
• Ulusoy M

• KMID: 2284742
• DOI: http://doi.org/10.4047/jap.2014.6.5.415

Abstract

PURPOSE
The purpose of this study was to evaluate and compare the translucency of shaded zirconia all-ceramic systems.
MATERIALS AND METHODS
Translucency of 3 different zirconia all-ceramic systems colored by different techniques was compared with a lithium disilicate glass-ceramic (IPS e.max Press). Square-shaped specimens with 0.5 mm thickness were fabricated from In-Ceram YZ, ICE Zirkon and Katana systems in A1, A2 and A3.5 shades according to Vitapan Classical shade tab (n=11). Specimens were then veneered and glazed with corresponding veneer ceramic recommended by each zirconia system manufacturer and the total thickness was set to 1.5 mm. Translucency measurements were performed with VITA Easyshade Compact spectrophotometer after each stage and translucency parameter was calculated. Data were statistically analyzed with repeated measures ANOVA and Tukey multiple comparison test.
RESULTS
The control group was significantly more translucent than the zirconia systems (P<.05). ICE Zirkon cores showed the least translucency; neither In-Ceram YZ nor Katana systems were superior to each other in terms of translucency. Translucency of all specimens was decreased after veneering, and the translucency rankings were changed.
CONCLUSION
Coloring technique did not have a significant effect on translucency of zirconia cores. Although zirconia systems were less translucent than lithium disilicate glass ceramic, they had partial translucency and there were translucency differences among the zirconia systems. Chroma affected the translucency of precolored zirconia cores.

Keyword

Translucency parameter; Zirconium oxide; Spectrophotometer; Color; Lithium disilicate; Y-TZP core

MeSH Terms

Ceramics
Glass
Ice
Lithium
Ceramics
Ice
Lithium

Figure

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  Fig. 1 A1, A2 and A3.5 shaded core specimens of each all-ceramic system.

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  Fig. 2 Translucency measurements of the specimens with a spectrophotometer over white (A) and black (B) backgrounds.

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  Fig. 3 TP values of core, veneered and glazed specimens.

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