Why Zirconium crowns are replacing Porcelain fused to metal crowns?

Why are monolithic Zirconium crowns becoming the most popular type of crown for posterior restorations? Probably because they exhibit of a number of obvious advantages . These include the fact that cadcam zirconium crowns have more affordable lab fees, are more resistant to fracture, require less tooth preparation and more biocompatible than porcelains or the metals used in most dental restoratio...