Influence of filler concentration on the colorimetric parameters of colored resin matrices for dental composites

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* 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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Nov 30, 2017 | Posted by in Dental Materials | Comments Off on Influence of filler concentration on the colorimetric parameters of colored resin matrices for dental composites
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