Optical properties of composites of selected shades in white light

Abstract

Light reflectivity, scattering coefficient, absorption coefficient, infinite optical thickness, and contrast ratio were determined in white light, for seven shades of a conventional composite and five shades of a microfilled composite, from reflection spectrophotometric data using Kubelka's equations. Significant differences among shades were observed for each property. Values of infinite optical thickness ranged from 2.97 to 5.90 mm among the shades studied.

Comparison of the metrics between the CIELAB and the DIN99 uniform color spaces using dental resin composite material values

“…The thickness of the specimens was 2 mm, which was lower than infinite optical thickness 17 ; however, since the standard white background (CIE L* ϭ 96.7, a* ϭ Ϫ0.1, and b* ϭ Ϫ0.2, average reflectance from 400 to 700 nm ϭ 91.6%) was used, and the clinical thickness of anterior dental restorations is generally less than 2 mm, color measured in the present study has clinical relevance. There were significant correlations between ⌬E* ab values and ⌬E 99 values after polymerization and thermocycling (r ϭ 0.77 and 0.68, respectively, P Ͻ 0.01).…”

Change of Color and Translucency by Light Curing in Resin Composites

“…In such situations, opaque-shade resin composites have been utilized. 12,[14][15] Charisma was selected in this study because, in a previous study, this product showed a relatively small change in TP and color during light curing, 10 while the remainder of the products are newer resin composites. In this study, the A2 and opaque A2 shades of Charisma showed a statistically significant increase in TP.…”

Differences in color, translucency and fluorescence between flowable and universal resin composites

“…20 Color measurement over the background of the corresponding material itself (cured, 2 mm thick) was performed to determine the inherent color of a material, 21 although the infinite optical thickness of these materials might be thicker or thinner than 4 mm because those of resin composites were in the range of 2.97-5.90 mm reported in a previous study. 22 The measurement was made after overlaying a specimen on another specimen of the cured same material. For example, to measure the color of ESF, the corresponding background was the cured ESF itself.…”