Available online 23 April 2019
Abstract
Statement of problem
Information regarding the influence of cements and material thickness on the final color of monolithic
zirconia restorations is lacking.
Purpose
The purpose of this in vitro study was to examine the effect of varying
resin cement
colors and material thicknesses on the color and translucency of a
high-translucent monolithic zirconia and to compare these effects with
those reported in similar studies that examined other dental zirconia
materials.
Material and methods
Katana
High Translucent (Kuraray) was used as a monolithic zirconia material. A
total of 80 disk specimens (10 mm in diameter) were made in 4 different
thicknesses of 0.5 mm, 1 mm, 1.5 mm, and 2 mm (n=20 per thickness). The
color of the specimens (Commission Internationale de l'Eclairage [CIE]
L*, a*, b* values) before cementation
was measured using a spectrophotometer. Specimens within each thickness
were further divided into 2 groups: transparent (n=10) and opaque
(n=10). A transparent or opaque self-etch adhesive
resin cement (Panavia V5) was then applied to each specimen. After
cementation, the color was measured again. The translucency parameter
(TP) and ΔE were calculated and evaluated with the color measurements by
using descriptive statistics, correlation analysis, single specimen t test, 2-way ANOVA, and the Tukey Honestly Significant Difference (HSD) test.
Results
Statistically significant (P<.001)
changes were found with the increasing thicknesses of the
high-translucency zirconia specimens. The TP, L*, and b* values
decreased, whereas the a* values increased. In both the transparent and
opaque groups, statistically significant (P<.001) increases
in L*, a*, and b* values and a significant decrease in TP were found
with cementation. The lowest ΔE value (1.19 for 2 mm) was observed for
monolithic zirconia-clear cement. The highest ΔE value (8.05 for the 0.5
mm) was observed for the monolithic zirconia and opaque cement
combination.
Conclusions
Material
thickness and cement color affected the color and translucency of
high-translucent monolithic zirconia, with effects similar to those
observed with other monolithic zirconia materials.
Comments