Assessment of bleaching procedures on the optical properties, surface roughness and microhardness of single-shade resin composites: an in-vitro study

All tested single-shade resin composites exhibited perceptible and clinically unacceptable color changes. The HP bleaching agent demonstrated the greatest negative effects on surface roughness and microhardness, while among the single-shade resin composites, CME and EU showed the highest degree of susceptibility to these effects. The interactions between restorative materials and bleaching agents should be taken into account when planning the bleaching of restored teeth.