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Useful Information From The Bench

Sunday, December 10, 2017

Instructions For Seating ALLZ and Other Zirconia Based C&B Restorations

Like most metals, zirconia exhibits a strong affinity for phosphate groups. We can take advantage of this fact with phosphate containing primers, such as Monobond Plus and Z-Prime Plus. Unfortunately, saliva also contains phosphates in the form of phospholipids, so when an ALLZ Zirconia C&B is tried in the patient’s mouth and comes in contact with saliva, the phosphate groups in the saliva bind to the zirconia oxide and cannot be rinsed out with water. Attempting to use phosphoric acid (which is full of phosphate groups) to “clean” the saliva out only makes the problem worse.

The recommended way to successfully remove these phosphate groups from the interior of a crowns with the use of Ivoclean from Ivoclar. This is a zirconia oxide solution placed inside the restoration for 20 seconds and rinsed out. Due to the large concentration of free zirconia oxide in the Ivoclean, it acts as a sponge and binds to the phosphate groups that were previously bound to the ALLZ restoration. Once the Ivoclean is rinsed out, you will have a fresh bonding surface for the Monobond plus or Z-Prime Plus to bond to.

The protocol would be:
1. Try in ALLZ Zirconia
2. Rinse saliva out of restoration
3. Place Ivoclean in restoration for 20 seconds and rinse
4. Cement restoration with Z-Prime plus/ Monobond Plus and place with cement of your choice or for best results bond.