Zirconia is a well tried material for crowns and bridges. We always use Cercon, a product of DeguDent, which represents aesthtic and safety. In contrast to standard crowns there is no metal framework necessary.
Now this material has been further improved:
Cercon ht stands for high translucency and still has better aesthetic properties. The light transmission is significantly increased, so that the crown margins are invisible. Moreover this material can be used in monolithic processing (Solid-Zirkonia-crowns). So in many cases a natural colour reproduction can be achieved without additional ceramic veneering. This decreases the amount of tooth preparation.