Crowns can be fabricated layered or full contour. Full contour crowns are created from a single block or material. Traditional porcelain fused to metal crowns have a hidden weakness – the porcelain layer over the substructure can chip and potentially cause the restoration to fail. Full Contour crowns do not present this problem.
Layered crowns, though weaker, provide better esthetics and a more natural presentation. IPS e.max layered offers higher translucency and the type of esthetics one looks for in anterior crowns.