Effect of Resin Luting Systems and Alumina Particle Air Abrasion on Bond Strength to Zirconia

Abstract

This study aimed to evaluate the effect of different primer/resin luting agent combinations and alumina air abrasion on the adhesion to zirconia. Eighty blocks (4×4×3 mm) of Lava Frame Zirconia (3M ESPE) were produced and randomly assigned into eight groups (n=10) according to two zirconia surface treatments (untreated or air abrasion with 50-μm alumina particles) and four luting systems (SU: Scotchbond Universal/RelyX Unicem 2; ZP: Z-Prime Plus/Duo-link Universal; MB: Monobond Plus/Variolink II; and AP: Alloy Primer/ED Primer II/Panavia F 2.0). After the conditioning and primer applications, resin luting agents were manipulated and applied on the zirconia, using a matrix, to form a cylinder (2 mm in diameter×2 mm high), followed by photoactivation for 40 seconds. After that, the specimens were stored in distilled water (37 °C) for 120 days and then submitted to shear bond strength testing, followed by failure mode evaluation under an optical microscope (30×). A two-way analysis of variance and Tukey test (α=0.05) were used for data analysis. Alumina air abrasion (Al) promoted higher bond values for the three luting systems, except for SU, which showed the best results without air abrasion, while with air abrasion, Al-SU, Al-ZP, and Al-MB presented higher values compared to Al-AP. We concluded that the alumina air abrasion of zirconia surfaces seemed to be dispensable for the SU group, while air abrasion (topographical alterations) enhanced the adhesion of the ZP, MB, and AP groups.

Evaluation of Different Zirconia Surface Treatments on their Microhardness

“…Zirconia surface can be treated either by micromechanical process or by chemical modification of the surface or a combination of both (7). The abrasion with aluminum oxide particles at different sizes ranged from 50-125 µm is considered and proved as an efficient treatment of zirconia surface before their delivery (8). A process involves attacking the surface with AL 2 O 3 particles at different distance and pressure to create surface roughness and increase irregularity for better resin cement interlocking (9,10).…”

Impact of multiple firings and resin cement type on shear bond strength between zirconia and resin cements

“… 16 21 24 Also, different variables such as surface conditioning methods and aging procedures of zirconia were found to influence the bond strength of resin cements with regard to MDP content. 15 16 17 19 20 21 22 23 24 25 However, the existing literature in connection with the effects of multiple firings on the bond strength of different types of resin cement is lacking.…”

Effect of different pH environments on the durability of bonds between zirconia and Ti-6Al-4V

“…According to a previous study, suprastructures exposed to the loss of retention were at a higher risk of a technical or biological failure 4) . However, the difficulty in zirconia bonding [5][6][7] , limited bond area for Ti-alloy base and short (3-4 mm) abutment, and poor retention form of some angled abutments make it hard for traditional cements (e.g., zinc oxide cement/glass ionomer cement/resin-modified glass ionomer) to provide an adequate retention force in these inevitable cases (Fig. 1).…”