They are also known as PFM (porcelain fused to metal) crowns. These have a strong interior metal core and a layer of porcelain exteriorly making it look like a natural tooth.
These can be used anteriorly unlike metal crowns.
They are durable, superior and have enough strength to bear chewing forces.
They are vulnerable to breaking and chipping as compared to metal crowns.
They are affordable than ceramic crowns.
In receding gums, these crowns are not suitable as they show distinctively because the porcelain is translucent showing the underlying metal.
Moreover, the porcelain wears out the opposing natural tooth in contact in the long run.
The porcelain can chip off if patient bites on very hard foods.
Some patients are allergic to nickel, so this type of crown is contraindicated in them.