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Questions & Answers on Zirconia

- Nov 26, 2018 -

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Q: Does zirconia ceramic degrade in strength intraorally in 5-10 years?

A: Yes, all-ceramic materials degrade in strength over time - some more than others. Zirconia ceramic  has an initial flexural strength of over 1200 MPa, so even if it degrades 5-10% or more, it is still significantly stronger than other ceramics. 


Q: Does it takes longer to remove a zirconia crown with a bur compared to a PFM crown?

A: Fine diamond burs can cut thru a zirconia crown just as fast as a PFM crown. 


Q: Does shading or coloring zirconia ceramic reduce the strength as compared to the uncolored zircona?

A: Weakening of colored zirconia ceramic copings has not been observed. 


Q: Is the fit of crowns and bridges based on zirconia copings as good as that of PFM crowns and bridges?

A: Yes, the marginal fit of crowns and bridges fabricated from zirconia copings can be as good or better than PFM crowns and bridges. 


Q: Is the fit of a zirconia coping important since the zirconia ceramic is so strong?

A: The thicker the cement the weaker the all-ceramic restoration. Cements are not as rigid as zirconia ceramic, so a thicker cement layer will cause more flexural deformation of a ceramic core, increasing the potential for fracture. 


Q: Does silane treatment improve the bond strength of a resin cement to a zirconia coping?

A: No, but the use of Rocatec/Cojet (3M ESPE) does. Silica particles are embedded into the surface of zirconia and then silanated. This treatment can increase the bond strength of a resin cement to a zirconia coping.