A white crystalline oxide of zirconium (zirconium dioxide, ZrO2) which exists in monoclinic, tetragonal, and cubic forms. Yttrium tetragonal zirconia polycrystals (Y-TZP) is the tetragonal form, with the addition of 3% yttrium oxide to act as a stabilizing agent, used as a core material for ceramic crowns and bridges (trade names: Lava, Cerec, Procera). The material has high resistance to fracture and degradation by water present in the saliva; it is fabricated using CAD/CAM technology. Zirconia may also be infiltrated with aluminium (70% aluminium, 30% zirconia) to produce a strong core material. Trade name: In-Ceram.
Burke F. J., Ali A., Palin W. M. Zirconia-based all-ceramic crowns and bridges: three case reports. Dent Update 2006;33(7):401–2, 405–6, 409–10.