In the old time we have to use Porcelain fused to metal crown which have the metal to be substructure for porcelain to fused with. This is the cause that Dentist cannot make crown look like natural. It always look dull because we have try to mask the metal color inside by making and opaque layer. Thanks to the lated technology now we can make Crown and Bridge without metal that have the translucency like natural tooth. The lated technology High Translucency Cercon make the even long span Bridge or Crown and Bridge that have the parafunction like Bruxism can be done with this material.