zirconia polycrystalline ceramic dental restoration material multilayered zirconia ceramic dental restoration material 2024-08-30T13:44:12Z A zirconia polycrystalline ceramic dental restoration material that contains layered structure composed of different compositions of dental zirconias to provide graded structures that mimic not only the shade, but the translucency and esthetic appearance of natural teeth. Nivedita Dutta (Chowdhury)