Abstract
BACKGROUND: An optimum combination of esthetics and mechanical properties is expected of all-ceramic restorations. Consequently, various pigmentation techniques of zirconia have been recommended to enhance the aesthetic results without compromising their long-term survival. METHODOLOGY: Infiltrate solutions of ceria-yttria were prepared by mixing their precursors in various concentrations. Pre-sintered zirconia samples were soaked in the infiltrate solutions and sintered according to the manufacturer's instructions. Phase analysis, microstructure using scanning electron microscopy, flexural strength, fatigue, CIE Lab, translucency parameter, surface roughness, and aging resistance of infiltrated zirconia were evaluated. RESULTS: Phase analysis confirmed the presence of the tetragonal phase of zirconia, and the microstructure revealed increased grain size. The flexural strength of infiltrated zirconia ranged from 248 MPa to 512 MPa, and the fatigue limit was lower than control zirconia with reduced surface roughness. The monoclinic content before and after aging was not detectable in the infiltrated samples. The CIE Lab values of the infiltrated samples showed a trend of decreasing lightness, accompanied by higher delta E values, with minimal change in translucency. CONCLUSIONS: Ceria-yttria infiltrated zirconia exhibited reasonable flexural strength and fatigue performance, with improved aging resistance, and color suitable for anterior and low-stress-bearing monolithic restorations.