Effect of airborne-particle abrasion and, acid and alkaline treatments on shear bond strength of dental zirconia

Abstract

The surface roughness, morphology and shear bond strength (SBS) of dental zirconia using three different surface treatment techniques were evaluated. Three groups of sintered zirconia blocks were treated as follow, 1) Airborne-particle abrasion (APA) group (G1-APA), 50-µm Al2O3; 2) APA and 9% hydrofluoric acid etching (G2-HF); 3) APA and Sodium Hydroxide (G3-NaOH). The specimens were evaluated for roughness [atomic force microscope (AFM)], morphology [Scanning Electron Microscope (SEM)] and for SBS in the universal testing machine. The AFM revealed changes in the roughness after the surface treatments, however there was not Ra difference between groups, SEM analysis revealed changes in surface morphology for all surface treated specimens. For SBS, significant difference was found between G1-APA=8.4±2.7 MPa and G2-HF=3.3±0.6 MPa (p<0.05) and G2-HF and G3-NaOH=9.0±3.0 MPa (p<0.05). The main fracture mode was mixed failure (63%) for G1-APA and G3-NaOH groups. G2-HF showed 100% adhesive failure. SBS was improved with NaOH, however application of HF significantly decreased SBS.

Effect of Surface Treatment with Alkaline Agents at Two Different Temperatures on Microshear Bond Strength of Zirconia to Composite Resin

“…Chemomechanical retention is required for a stable bond between ceramic and composite resin. Different surface treatments have been proposed to enhance bonding to zirconia, such as sandblasting, tribochemical silicoating, and laser irradiation [ 1 , 2 , 10 , 11 ]. Sandblasting creates a porous surface and increases the bonding surface area and micromechanical retention [ 1 ].…”

“…Chemical surface treatments have also been suggested along with mechanical surface treatments to further enhance the bond strength to zirconia [ 10 , 12 , 13 ] such as application of bonding agents containing hydrophobic phosphate monomers, e.g., 10-methacryloyloxydecyldihydrogen¬phosphate (10-MDP) [ 8 , 10 , 13 , 14 ]. It has a hydrophobic methacrylate group at one end, which can bond to methacrylate-based restorations and cements, and has a polar phosphate group at the other end, which can bond to zirconia [ 1 , 10 , 13 , 15 ]. Primers containing 10-MDP create a reactive surface between zirconia and composite resin and enhance the μ SBS of zirconia to composite [ 13 , 14 ].…”

Effect of hot etching with HF on the surface topography and bond strength of zirconia

“…However, zirconia ceramics do not contain silica components, and surface treatment with hydrofluoric acid and silane coupling agents application of zirconia ceramics is not a well-established method to achieve durable adhesion resin-based materials (Valente et al, 2020). Therefore, achieving the ideal bonding effect of zirconia is a significant problem that urgently needs to be solved in oral clinics (Flores-Ferreyra et al, 2019). Studies have shown that zirconia includes three crystal phases: monoclinic, tetragonal and cubic phases (Sriamporn et al, 2014).…”

Effect of colourants on the optical characteristics and structure of Y2O3 stabilised tetragonal zirconia ceramic

“…Ceramic, a commonly used prosthetic material in stomatology, has very good biocompatibility, excellent corrosion resistance and wear resistance 1 . It has been currently recognised as the most realistic dental restoration material due to its prominent aesthetic performance 2 .…”