What is the difference between porcelain and zirconia crowns?

In our clinic, we offer both porcelain and zirconium crowns, each with specific characteristics:

• Porcelain crowns: They are composed of a metal base covered with porcelain, which gives them an aesthetic appearance, but over time, a dark line may appear on the gum.
• Zirconium crowns: They are completely metal-free, highly resistant, and integrate better with the gum, providing a more natural appearance and greater durability.
  We recommend zirconium crowns for patients seeking the best esthetics and strength, especially in front teeth or large restorations.