Zirconia Bond is a Reality
The myth of the NO-ZIRCONIA BOND is almost extinguished. Much research verifies that the chemical, MDP really bonds to zirconia surfaces.
So, the first thing to do is treat your Zirconia surface right….. from the start.
To set the record – the following materials need to be removed from Zirconia prior to bonding
- Saliva & blood = Contaminants and zirconia bond blocker
- Phosphoric Acid = Takes up the bonding site
- Silane = Does not work on Zirconia and should only be used for ceramics / porcelain
CONTAMINATION
During try-in, the phosphate ions in saliva renders the zirconia surface virtually unbondable.
surface. You cannot remove this ionic bond by rinsing with water or ultrasonic cleaning. You need to use an alkaline solution like ZirClean.
ZirClean’s is potassium hydroxide (KOH, pH13).
ZirClean re-exposes the bonding sites
ETCHING
Zirconia cannot be chemically etched with Phosphoric or Hydrofluoric Acids.
To ‘Etch’ Zirconia use a MicroEtcher gently
Use 50-micron aluminium oxide in the MicroEtcher IIA at 30-45 psi on a 60-degree angle at a 1 to 2 cm distance for less than 20 seconds.
CLEANING
‘Cleaning’ Zirconia with phosphoric etch is a big fat No-No.
Phosphoric acid takes up the bonding sites on the zirconia.
Zirconia needs is to be cleaned with ZirClean® a high pH gel
Now apply MDP, zirconia bonding material, either Z Prime Plus or TheraCem.
Click to read a great explanatory article on the matter:
https://www.dentistrytoday.com/products/product-highlights/item/5499-bisco-creating-solutions-to-clinical-challenges
ZirClean may also be used to clean & remove organic matter on metal & ceramic surfaces.
ZirClean Kit contains 5 gm Syringe of ZirClean, 30 disposable tips, and instructions
