Shear bond strength of an acrylic resin to a ceria-stabilize
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Ceria-stabilized zirconia-alumina nanocomposite (Ce-TZP-Al2O3) has properties that may be suitable for partial denture frameworks. This study suggests that surface treatment of Ce-TZP-Al2O3 improves the bonding.

The purpose of this in vitro study by the Journal of Prosthetic Dentistry was to determine the optimal surface treatment for Ce-TZP-Al2O3 to secure a durable bond with an acrylic resin.

The surface of Ce-TZP-Al2O3 test specimens was alumina airborne-particle abraded (Group APA) and then treated with 10-methacryloyloxydecyl dihydrogen phosphate (MDP) (Group MDP) and 2 silica coating methods: the flame spraying method (Group SLP) and the tribochemical treatment (110 μm: Group TRB-P, 30 μm: Group TRB-S). TRB-P and TBR-S were further treated by MDP (Group CBT-P and CBT-S). Autopolymerizing acrylic resin was bonded to the specimens, and the shear bond strength was tested after thermocycling. The area of the resin remaining on the fractured surfaces was also measured.

--After placement in deionized water for 24 hours, the shear bond strengths of Group MDP and 2 types of combination treatment (Groups CBT-P and CBT-S) were significantly higher than those of Groups SLP, TRB-P, and TRB-S.

--Moreover, the fractured surface of all the treatment conditions except Group APA showed cohesive failure. The shear bond strength as a result of all treatment conditions decreased significantly after thermocycling.

--Group CBT-S showed the highest shear bond strength; however, no significant differences were found between Groups CBT-S and MDP.

--In particular, the area of resin remaining on the fractured surfaces of Group CBT-S was 100%.

The combined surface treatment of alumina airborne-particle abrasion and tribochemical treatment, along with primer treatment using silane coupling and an MDP monomer, improved the adhesion strength and adhesion durability between base resins and Ce-TZP-Al2O3.