Zirconia is a material used for restorative dental treatments. It is a type of ceramic, or in more specific terms, a zirconium oxide, that is stronger than porcelain and some metal alloys. Zirconia crowns are very durable and the main benefit of zirconia crowns is their strength and longevity. Most crowns can last at least 10 to 15 years, there are times when zirconia can last a lifetime.