J Adv Prosthodont.  2013 Aug;5(3):262-269. 10.4047/jap.2013.5.3.262.

Perceived color shift of ceramics according to the change of illuminating light with spectroradiometer

• Cha HS
• Yu B
• Lee YK

• KMID: 2118165
• DOI: http://doi.org/10.4047/jap.2013.5.3.262

Abstract

PURPOSE
Perceived color of ceramics changes by the spectral power distribution of ambient light. This study aimed to quantify the amount of shifts in color and color coordinates of clinically simulated seven all-ceramics due to the switch of three ambient light sources using a human vision simulating spectroradiometer.
MATERIALS AND METHODS
CIE color coordinates, such as L*, a* and b*,of ceramic specimens were measured under three light sources, which simulate the CIE standard illuminant D65 (daylight), A (incandescent lamp), and F9 (fluorescent lamp). Shifts in color and color coordinate by the switch of lights were determined. Influence of the switched light (D65 to A, or D65 to F9), shade of veneer ceramics (A2 or A3), and brand of ceramics on the shifts was analyzed by a three-way ANOVA.
RESULTS
Shifts in color and color coordinates were influenced by three factors (P<.05). Color shifts by the switch to A were in the range of 5.9 to 7.7 DeltaE*abunits, and those by the switch to F9 were 7.7 to 10.2; all of which were unacceptable (DeltaE*ab > 5.5). When switched to A, CIE a* increased (Deltaa*: 5.6 to 7.6), however, CIE b* increased (Deltab*: 4.9 to 7.8) when switched to F9.
CONCLUSION
Clinically simulated ceramics demonstrated clinically unacceptable color shifts according to the switches in ambient lights based on spectroradiometric readings. Therefore, shade matching and compatibility evaluation should be performed considering ambient lighting conditions and should be done under most relevant lighting condition.

Keyword

Color shift; Ceramic materials; Illuminating light; Spectroradiometer

MeSH Terms

Androsterone
Ceramics
Humans
Light
Lighting
Reading
Vision, Ocular
Androsterone
Ceramics

Figure

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  Fig. 1 Vectorial shifts of lightness (CIE L*) and chroma for A2-veneered ceramics by switch of lights.

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  Fig. 2 Vectorial shifts of lightness (CIE L*) and chroma for A3-veneered ceramics by switch of lights.

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  Fig. 3 Vectorial shifts of CIE a* and b* values for A2-veneered ceramics by switch of lights.

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  Fig. 4 Vectorial shifts of CIE a* and b* for A3-veneered ceramics by switch of lights.

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