There are a number of metal free materials available for manufacturing fixed restorations.
Zirmil restorations are full contour zirconia manufactured using CAD-CAM processes. The benefits of Zirmil is its accuracy, extreme strength, and durability. Zirmil is moderately aesthetic and is ideal for posterior crown and bridge.
Zirmil restorations are full contour zirconia with translucent properties manufactured using CAD-CAM processes. The benefits of Zirmega are its superior strength, aesthetics, and translucent qualities. Zirmega is a good all rounder and can be used for anterior and posterior restorations, and bridge up to 3-units.
Zirmax restorations are porcelain veneered to zirconia, the zirconia core is milled using CAD/CAM processes, and the porcelain is veneered by hand. Zirmax is highly aesthetic, and provides an excellent fit, it's not as strong as full contour zirconia, however, is a great option for anterior restorations for its high aesthetic properties.