The Zirconia crown does not rot the remaining tooth stump which is sometimes observed with metal ceramic crowns. Durability: With the use of recent technology like CAD CAM and laser sintering which makes more precise zirconium crowns which snuggly fit over teeth. Crowns made with monolithic zirconia are more durable.
Zirconia offers superior strength and durability for dental crowns. It is at least three times stronger than porcelain or PFM restorations. Unlike porcelain, zirconia can withstand wear and tear without chipping, which is why zirconia restorations tolerate extreme chewing and bruxism.
Zirconia, like many ceramics, contains metal atoms, but it's not a metal. It's a ceramic, one which combines the biocompatible aspects of ceramics with a very high strength–stronger than titanium in some ways.
