Colorimetric analysis of dental porcelains: effects of the background color

Rodrigues, C. S.; Lenz, J. M.; May, L. G.; Jacques, L. B.

doi:10.1590/0366-69132022683853190

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Articles • Cerâmica 68 (385) • Jan-Mar 2022 • https://doi.org/10.1590/0366-69132022683853190 copy

Colorimetric analysis of dental porcelains: effects of the background color

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Abstract

This study evaluated how the background (white or gray) affects the color parameter measurements and color difference calculations (∆E_ab and ∆E₀₀) of dental ceramics. Disc-shaped feldspathic ceramic specimens were prepared with two shades (enamel and dentin) and stained in red wine (7-day immersion). A spectrophotometer was used to perform color measurements (CIEL*a*b* coordinates) over gray and white backgrounds after the specimen preparation and after staining. The color difference was calculated with CIEDE2000 (ΔE₀₀) and CIELAB (ΔE_ab) formulae. Initial L*a*b* coordinates, ΔE₀₀, and ΔE_ab data were analyzed with t-tests separately for each ceramic shade. White background led to higher values of L* and b* coordinates from the enamel shade, and of L*, a*, and b* coordinates from the dentin shade. However, ΔE₀₀ and ΔE_ab results from white and gray backgrounds were similar in both ceramic shades. Therefore, background color did not affect the color difference results of the slightly stained feldspathic ceramic samples.

Keywords:
dental ceramic; color; CIEL*a*b* system

Material	Commercial brand	Manufacturer
Feldspathic ceramic	Vita VM9 shade EE1	Vita Zahnfabrik
Feldspathic ceramic	Vita VM9 shade 3M3	Vita Zahnfabrik
Fermented of cabernet sauvignon grapes	Almadén red wine	Miolo

Opacity	Background	L^*	a^*	b^*	∆E_ab	∆E₀₀
Enamel	White	70.61 (0.82)^a	-0.76 (0.15)^a	2.39 (0.22)^a	2.62 (0.56)^a	2.11 (0.45)^a
Enamel	Gray	57.78 (0.39)^b	-0.79 (0.11)^a	-1.61 (0.15)^b	2.54 (0.36)^a	2.37 (0.33)^a
Dentin	White	74.08 (0.79)^a	5.26 (0.13)^a	25.35 (0.62)^a	2.91 (0.51)^a	2.17 (0.39)^a
Dentin	Gray	68.99 (0.66)^b	2.59 (0.08)^b	19.89 (0.57)^b	2.76 (0.54)^a	2.19 (0.42)^a

Opacity	Measurement	White background			Gray background
Opacity	Measurement	L^*	a^*	b^*	L^*	a^*	b^*
Enamel	Baseline	70.61 (0.82)^a	-0.76 (0.15)^a	2.39 (0.22)^a	57.78 (0.39)^a	-0.79 (0.11)^a	-1.61 (0.15)^a
Enamel	Staining	68.04 (0.78)^b	-0.33 (0.20)^b	2.33 (0.16)^a	55.26 (0.39)^b	-0.55 (0.13)^b	-1.52 (0.13)^b
Dentin	Baseline	74.08 (0.79)^a	5.26 (0.13)^a	25.35 (0.62)^a	68.99 (0.66)^a	2.59 (0.08)^a	19.89 (0.57)^a
Dentin	Staining	71.26 (0.81)^b	5.54 (0.21)^b	24.90 (0.74)^b	66.29 (0.71)^b	2.75 (0.24)^b	19.47 (0.52)^b

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