Statement of problem
Clinically relevant assessment of all-ceramic crowns supported by esthetic composite
resin foundations has not been evaluated with regard to color reproducibility.
Purpose
This in vitro study quantitatively evaluated the influence of different shades of
composite resin foundations and resin cement on the final color of a leucite-reinforced
all-ceramic material.
Material and methods
A total of 128 disks were fabricated; 64 (20 × 1 mm) were made of all-ceramic material
(IPS Empress) and 64 (20 × 4 mm) of 4 different shades composite resin (Tetric Ceram).
The ceramic and composite resin disks were luted using 2 shades (A3 and Transparent)
of resin cement (Variolink II). Color was measured using a colorimeter configured
with a diffuse illumination/0-degree viewing geometry, and Commission Internationale
de l'Eclairage (CIE) L∗a∗b∗ values were directly calculated. Descriptive statistical analysis was performed,
and color differences (ΔE) for the average L∗, a∗ and b∗ color parameters were calculated. Repeated measures analysis of variance (ANOVA)
was used to compare mean values and SDs between the different color combinations (α=.05).
Results
The CIE L∗a∗b∗ color coordinate values showed no significant differences for variation in color
parameters due to the effect of the different composite resin shades (P=.24) or cement shades (P=.12). The mean color difference (ΔE) value between the groups was 0.8.
Conclusion
Within the limitations of this study, the use of different shades for composite resin
cores and resin cements presented no statistically significant effect on the final
color of IPS Empress all-ceramic material.
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Article info
Publication history
The Ohio State University College of Dentistry, Columbus, Ohio; Beirut Arab University College of Dentistry, Beirut, Lebanon; University of Alexandria College of Dentistry, Alexandria, Egypt
Footnotes
Presented at the 35th Annual Meeting of the AADR, March 2006, Orlando, Fla.
Identification
Copyright
© 2006 The Editorial Council of The Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
