A zirconia crown is considered a top quality type of crown which is stronger, durable and visually appealing as compared to other types of crowns.
It is often preferred to metal ceramic crowns in that it causes less tooth sensitivity and with no sign of the dreaded grey line around the edge of the gums. For many people this is a downside of wearing a crown or a bridge.
But one way of avoiding that is to choose an all ceramic bridge or the highly rated zirconia bridge instead. More on my perfect dentist