Device Description : Light-curing composite for all dental shades for use in anterior and posterior r (View more) Light-curing composite for all dental shades for use in anterior and posterior restorations, recommended for all classes of cavities.The optical properties of Vittra APS Unique come from a fine balance between refractive indices of the dental structure versus that of the resin, which results in the propagation of the base color (dental remnant) through the resin structure. This effect causes the resin to "assume" (or transmit) the tooth color. It has a fundamental role, the loads, the well-balanced opacity of the product and the aesthetic of the APS system. (View less)