Utilizes Tokuyama's patented innovative initiator system “Radical Amplified Photopolymerization Technology” (RAP), to offer reduced curing time and stability to ambient light while maintaining the esthetic and physical properties of Estelite Sigma. Extended working time - 90 sec. under ambient light. Indications: anterior and posterior restorations, composite veneer, Diastema closure and composite/porcelain repair. A1