he mechanical properties of zirconium are optimum, comparatively with the other ceramic materials. Initial and fracture resistance, as well as its resistance to flexion, the white, opaque colour, permitting several shades, the special biological properties, largely recommend largescale utilization of zirconium in prosthetic restorations. Zirconium crowns and bridges were realized in 129 patients (81 women and 48 boys), with ages between 15 and 57 years, along 4 years. The working method applied in the laboratory made use of the CAD-CAM system, followed by scanning on a Dental Wings scanner and a CAM burring system from Wieland 917, 18. In a few cases, repeated evaluations evidenced accidents and complications, such as skeletal fractures, ceramic chipping, decementation, etc.
Keywords:- bio-mechanical advantages
- clinical evaluation
- zirconium