Zirconia crowns are made of zirconium oxide, which has been used extensively in Iran for several years. These cushions are manufactured by the cad-cam machine and have high strength because the blocks are compact and porous and The pores are fine, which makes it extremely robust. Zirconia specimens have properties that have plenty of advantages over PFM coatings. The doctor has an insult in this Trend file. An insult doctor in this image file about the advantages of zirconia is a description We are inviting you to see this image file.