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The ‘Y’ Classification of Zirconia

Have your dentists asked you how much yttria there is in your zirconia? Typically, this question comes after the dentist has been to a lecture or heard other clinicians refer to “3Y” or “5Y” zirconia.

This classification system is called the "mole percent" of yttria present in the zirconia. Most companies provide a weight percent of zirconia rather than mole percent.