Durability of resin bonding to zirconia ceramic using different primers
1Department of Prosthodontics, Propaedeutics and Dental Materials, Dental School, Christian Albrechts University, Kiel, Germany.
Purpose:
The purpose of this in vitro study was the evaluation of the bond strength and its durability to zirconia ceramic after using two phosphate monomer-containing primers.
Materials And Methods:
Plexiglas tubes filled with composite resin were bonded to zirconia ceramic disks (Cercon) which were air abraded (50 microm Al2O3 at 2.5 bar pressure) and ultrasonically cleaned in isopropanol for 3 min. Groups of 16 specimens each were bonded with Multilink Automix using either no primer (NO) or using a metal primer (AP: Alloy Primer, Kuraray) or a metal and zirconia primer (MZ: Metal/Zirconia Primer, Ivoclar Vivadent). Another group bonded with a phosphate monomer (MDP) containing resin (PF: Panavia F, Kuraray) served as control for an established bonding method to zirconia ceramic. Prior to tensile bond strength testing, subgroups of 8 bonded specimens were stored in distilled water (37 degrees C) for either 3 or 150 days. Additionally, the 150-day specimens were thermocycled (TC) between 5 degrees and 55 degrees 37,500 times. Statistical analyses were conducted with the Wilcoxon rank sum test.
Results:
Without primer, the median initial bond strength of Multilink Automix to zirconia ceramic was relatively low (12.4 MPa). The primers improved the bond strength significantly (p
Conclusion:
Using phosphate monomer-containing primers on air-abraded zirconia ceramic improves bonding to zirconia ceramic significantly.
