Objectives . The aim of the study was to assess the correlation between the percentage of fillers and the colorimetric parameters of colored resin matrices used for dental composites.

Materials and methods . Six colored resin matrices (Herculite B1 Enamel, A3 Enamel, C4 Enamel, B1 Dentin, A3 Dentin, and C4 Dentin, provided by Kerr-Hawe company by incorporating the normal coloring pigments for the given shade into the neat resin) were mechanically mixed with various concentrations of a barium glass filler (0.7 μm mean particle size, provided by Kerr-Hawe company) in a DAC-150 mixer (Flacktek, Landrum, SC, USA). The experimental composites contained filler levels of 30, 35, 40, 45, 50, 55, 60, 65 and 70 wt%. Five one mm thick, disk-shaped samples were prepared for each experimental group by curing in a standard mold with a QTH light (Trilight Elipar- 3M/Espe) at 800 mW/cm ² . Samples were stored for one week after the light curing at 37 °C in air before the colorimetric evaluation. One reading per sample was performed either on a white background or on a black background with a color guide (Byk Gardner): illuminant C, illuminating/viewing geometry 45°/0° and standard observer 2 degrees. 12 colorimetric parameters were measured: L*, a*, b*, C* (chroma), h° (hue), White Berger (WB) Index, Yellowness (YI) D1925 index. Linear correlations were calculated and R ² data are given in the following table (data obtained either on a white-W- or on a black-B- background).

Results

Shades		Colorimetric parameters
		L*	a*	b*	C*	h°	WB	YI D1925
B1 E	W	0.518	0.503	0.957	0.955	0.870	0.958	0.967
	B	0.920	0.149	0.927	0.927	0.710	0.671	0.960
A3 E	W	0.059	0.943	0.991	0.991	0.920	0.988	0.988
	B	0.983	0.079	0.820	0.584	0.748	0.850	0.718
C4 E	W	0.742	0.928	0.938	0.938	0.906	0.936	0.957
	B	0.974	0.310	0.060	0.050	0.235	0.780	0.637
B1 D	W	0.296	0.335	0.974	0.969	0.946	0.966	0.974
	B	0.780	0.610	0.967	0.956	0.959	0.912	0.970
A3 D	W	0.823	0.959	0.973	0.974	0.940	0.967	0.974
	B	0.659	0.700	0.961	0.964	0.854	0.958	0.969
C4 D	W	0.916	0.958	0.979	0.981	0.926	0.947	0.970
	B	0.929	0.825	0.665	0.652	0.820	0.878	0.917

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