Trouble Cementing Zirconia Crowns?
Posted on 05/18/2015
Zirconia based crowns have become one of the most popular restorative materials in dentistry. Originally branded as Lava by 3M, or Procera Zirconia by Nobel Biocare, today’s Zirconia are perhaps best known by the Bruxzir brand promoted by Glidewell. However, there are at least a dozen other brands of Zirconia now on the market, and we can be sure to see many others in the upcoming future.
But while the PFM has been around for over forty years, Zirconia restorations are less than ten years old. And that places some challenges for doctors with regards to cementation. What cements to use, and how to cement, are among the more common questions we receive.
In searching for answers to this topic, the best information we have come across has been from Dr. Michael DiTolla—a speaker and dentist in residence at Glidewell. In a video available at http://tinyurl.com/ZirconiaCement, Dr. DiTolla outlines the following protocol:
Step 1: Try in the crown.
Step 2: Clean the crown to remove phosphates found in saliva. He recommends Ivoclean by Ivoclar. We have found good results with this as well. Note: Phosphoric Acid, Water or Hydroflouric Acid will not remove the phosphates. Only sandblasting with 50 micron alumina oxide or Ivoclean will do the trick.
Step 3: Use a Silane solution with Phosphate groups such as Monobond by Ivoclar or Z Prime from Bisco. Both will make the zirconia adhere to cements.
Step 4: Use any cement of your choice
So what’s so special about Ivoclean? It is essentialy zirconia oxide in a liquid form. So it attracts the phosphates off of the zirconia. Making the restoration clean again for cementation.
But while the PFM has been around for over forty years, Zirconia restorations are less than ten years old. And that places some challenges for doctors with regards to cementation. What cements to use, and how to cement, are among the more common questions we receive.
In searching for answers to this topic, the best information we have come across has been from Dr. Michael DiTolla—a speaker and dentist in residence at Glidewell. In a video available at http://tinyurl.com/ZirconiaCement, Dr. DiTolla outlines the following protocol:
Step 1: Try in the crown.
Step 2: Clean the crown to remove phosphates found in saliva. He recommends Ivoclean by Ivoclar. We have found good results with this as well. Note: Phosphoric Acid, Water or Hydroflouric Acid will not remove the phosphates. Only sandblasting with 50 micron alumina oxide or Ivoclean will do the trick.
Step 3: Use a Silane solution with Phosphate groups such as Monobond by Ivoclar or Z Prime from Bisco. Both will make the zirconia adhere to cements.
Step 4: Use any cement of your choice
So what’s so special about Ivoclean? It is essentialy zirconia oxide in a liquid form. So it attracts the phosphates off of the zirconia. Making the restoration clean again for cementation.
