Zirconium crowns are made of zirconium, which has a strong type crystal structure. They are ideal in cases of damaged teeth due to extreme decaying, aesthetically unsightly teeth, discolored teeth, and especially in renewing old crowns, crowns that may have lost compatibility with surrounding gums. Zirconium crowns are long-lasting and they have properties that make them to be resistant against breaking, chipping, cracks and oxidation. They are also preferred because they are not worn out for a long time;  their clear, translucent appearance allows for the ideal tooth coloring that matches with the rest of patient’s teeth. Since Zirconim does not need to have the metal layer below the outer layer (as in porcelain crowns), they could be ideal for those who have metal allergy.