A crown covers a tooth too damaged to be restored any other way, often after a fracture, extensive decay or root canal treatment. Zirconia is a very strong ceramic that has been marketed for well over a decade as the premium option. The published five-year data give a more mixed picture than that story suggests.
What the five-year figures show
For single crowns on natural teeth, five-year survival was 94.7% for metal-ceramic, 96.6% for lithium disilicate, 96% for densely sintered alumina, 94.6% for glass-infiltrated alumina and 92.1% for densely sintered zirconia. Zirconia crowns were lost significantly more often than metal-ceramic ones, through fracture of the veneering ceramic and through loss of retention. The review concluded that zirconia-based single crowns should not be a primary option because of these technical problems.
Monolithic versus veneered
The nuance matters. That review largely covered veneered zirconia, meaning a zirconia core with a cosmetic ceramic layer on top, and it was that layer which chipped. Modern monolithic zirconia is milled from a single block and has no veneer to fracture, so it may well behave differently. But long-term comparative data on monolithic crowns are still limited. The honest formulation is that the evidence is more mixed than the marketing suggests, not that zirconia is a bad material.
What to ask
Ask which material is being used and whether it is monolithic or veneered; why that choice suits this particular tooth; what shade is planned; and who is responsible if a crown debonds or chips after you are home. Have those answers written into the quotation rather than agreed verbally.