Abstract
Statement of problem
The type of resin-based luting agent might influence the color stability of ceramic
veneers.
Purpose
The purpose of this study was to investigate the effects of resin-based agents and
aging on the color stability of ceramic veneers bonded to enamel.
Material and methods
Ceramic disks were cemented to bovine enamel disks with 4 resin-based luting agents
(n=10): dual-polymerizing cement (RelyX ARC), light-polymerizing cement (RelyX Veneer),
flowable composite resin (Filtek Z350 Flow), or composite resin preheated for 30 minutes
at 60°C (Filtek Z350 XT). CIE L*, a*, and b* color coordinates were measured 24 hours
after cementation (baseline) with a color spectrophotometer and reevaluated after
10 000 and 20 000 thermal cycles. Color variation was calculated by using CIELab (ΔE*ab) and CIEDE2000 (ΔE00) methods. Then 95% confidence intervals were calculated for color variation means
between baseline and 10 000 thermal cycles and between 10 000 and 20 000 thermal cycles.
The 95% confidence intervals were also calculated for the means of individual color
coordinates (L*, a*, and b*).
Results
The dual-polymerizing cement had the highest color variation among all luting agents.
No significant differences were found in color variation among the light-polymerizing
materials. All agents showed ΔE*ab>3.46 and ΔE00>2.25 after 20 000 thermal cycles. Variations in L*, a*, and b* coordinates were material
dependent. The dual-polymerizing agent was yellowish and reddish after aging.
Conclusions
The dual-polymerizing cement had higher color variation than the light-polymerized
materials when used for bonding ceramic veneers to enamel. Flowable and preheated
composite resins had similar color stability to that of light-polymerizing resin-based
cement.
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Article info
Publication history
Published online: April 13, 2015
Identification
Copyright
© 2015 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
