Reliability of the color measurement of resin composites using images
obtained using a stereoscopic loupe

Alexsandra Santos ALBUQUERQUE; Rafaella BRAGANÇA; Oscar Emilio PECHO; André Luis FARIA-E-SILVA

doi:10.1590/1807-3107bor-2024.vol38.0032

PMC full text:

Braz Oral Res. 2024; 38: e032.

Published online 2024 May 13. doi: 10.1590/1807-3107bor-2024.vol38.0032

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Table 1

Means and standard deviations of the CIELAB color coordinates measured using the spectrophotometer or calculated based on a method associating images acquisition by a CCD, a stereoscopic loupe, and an open-access image processing software, for different backgrounds and composite shades.

Color coordinate	Background	Method	Composite shade

			DA1	DA2	DA3	DA4
L*	White	Spectrophotometer	81.3 (0.4) ^Aa	77.9 (0.2) ^Ab	73.9 (0.5) ^Ac	67.6 (0.2) ^Ad
	White	CCD + Loupe	71.2 (0.5) ^Ba	68.9 (0.5) ^Bb	65.0 (0.5) ^Bc	59.4 (0.6) ^Bd
	Black	Spectrophotometer	78.4 (0.1) ^Aa	75.0 (0.3) ^Ab	71.5 (0.3) ^Ac	65.3 (0.1) ^Ad
	Black	CCD + Loupe	67.4 (0.5) ^Ba	64.7 (0.8) ^Bb	61.8 (0.2) ^Bc	55.8 (0.3) ^Bd
a*	White	Spectrophotometer	0.4 (0.0) ^Bd	2.3 (0.1) ^Bc	3.6 (0.1) ^Bb	4.2 (0.1) ^Ba
	White	CCD + Loupe	2.3 (0.2) ^Ad	5.1 (0.1) ^Ac	6.7 (0.5) ^Ab	7.6 (0.1) ^Aa
	Black	Spectrophotometer	-1.6 (0.1) ^Bd	-0.4 (0.1) ^Bc	0.7 (0.1) ^Bb	1.3 (0.1) ^Ba
	Black	CCD + Loupe	-1.2 (0.2) ^Ad	1.1 (0.4) ^Ac	2.6 (0.1) ^Ab	4.1 (0.1) ^Aa
b*	White	Spectrophotometer	17.1 (0.5) ^Ac	20.6 (0.2) ^Ab	22.5 (0.5) ^Aa	23.8 (0.1) ^Aa
	White	CCD + Loupe	16.1 (0.4) ^Ac	20.3 (0.8) ^Ab	21.3 (0.5) ^Ab	23.9 (0.3) ^Aa
	Black	Spectrophotometer	12.8 (0.3) ^Ad	16.1 (0.4) ^Ac	18.5 (0.3) ^Ab	20.1 (0.2) ^Aa
	Black	CCD + Loupe	9.3 (0.4) ^Bd	13.7 (0.9) ^Bc	16.8 (0.5) ^Bb	20.1 (0.2) ^Aa

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For each color coordinate vs. background, distinct letters (uppercase comparing methods, lowercase comparing composite shade) indicate statistical difference at Tukey`s test (p < 0.05).