Abstract
Statement of problem
In restorative prostheses, color is important, but the choice of color difference
formula used to quantify color change in acrylic resins is not straightforward.
Purpose
The purpose of this in vitro study was to choose a color difference formula that best
represented differences between the calculated color and the observed imperceptible
to unacceptable color and to determine the corresponding perceptibility and acceptability
threshold of color stability for denture base acrylic resins.
Material and methods
A total of 291 acrylic resin denture base plates were fabricated and subjected to
radiation tests from zero to 42 hours in accordance with ISO 7491:2000. Color was
measured with a portable spectrophotometer, and color differences were calculated
with 3 International Commission on Illumination (CIE) formulas: CIELab, CMC(1:1),
and CIEDE2000. Thirty-four observers with no deficiencies in color perception participated
in psychophysical perceptibility and acceptability assessments under controlled conditions
in vitro. These 2 types of assessments were regressed to each observer by each formula
to generate receiver operator characteristic (ROC) curves. Areas under the curves
(AUCs) were then calculated and analyzed to exclude observers with poor color discrimination.
AUCs were subjected to 1-way ANOVA (α=.05) to deter the statistical significance of
discriminability among the 3 formulas in terms of perceptibility and acceptability
judgments. Student-Newman-Keuls tests (α=.05) were used for post hoc comparison.
Results
CMC(1:1) and CIEDE2000 formulas performed better for imperceptible to unacceptable
color differences, with corresponding CMC(1:1) and CIEDE2000 values for perceptibility
of 2.52 and 1.72, respectively, and acceptability thresholds of 6.21 and 4.08, respectively.
Conclusions
Formulas CMC(1:1) and CIEDE2000 possess higher discriminability than that of CIELab
in the assessment of perceptible color difference threshold of denture base acrylic
resin. A statistically significant difference exists between perceptibility and acceptability
thresholds for denture base acrylic resin.
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Article info
Publication history
Published online: August 12, 2015
Identification
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© 2015 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
