Effect of the difference in spectral outputs of the single and dual-peak LEDs on the microhardness and the color stability of resin composites

The degree of resin polymerization achieved during a restoration placement is a major factor in the success and predictability of resin composite restorations. The polymerization of resin composite depends on many intrinsic conditions, such as the type of the photoinitiator, composition of filler particles, shade and degree of translucency of the materials. In addition, the effective spectral output and irradiance of the light curing unit are needed for adequate polymerization. Camphorquinone (CQ) has been largely used as a photoinitiator since the introduction of visible-light activated resin composites. However, alternative photoinitiators have been studied because the intense Effect of the difference in spectral outputs of the single and dual-peak LEDs on the microhardness and the color stability of resin composites