Bonding Effectiveness of Veneering Ceramic to Zirconia after Different Grit-Blasting Treatments

• Published in: Dentistry journal 2024-07, Vol.12 (7), p.219
• Main Authors: Zicari, Francesca, Monaco, Carlo, Vivan Cardoso, Marcio, Silvestri, Davide, Van Meerbeek, Bart
• Format: Article
• Language: English
• Subjects: Aesthetics; Aluminum oxide; Blasting; Bond strength; Bonding strength; CAD-CAM systems industry; Ceramic bonding; Ceramics; Chipping; Coatings; Failure; Fractures; Grit; grit-blasting; micro-tensile bond strength; Optical properties; Porcelain; Scanning electron microscopy; Silicon dioxide; Sintering; Statistical analysis; Stress concentration; Surface roughness; Surface treatment; surface treatments; Variance analysis; Veneering; veneering ceramic; Zirconia; Zirconium dioxide; Zirconium oxide
• ISSN: 2304-6767; 2304-6767
• DOI: 10.3390/dj12070219

To determine the effect of grit-blasting before and after sintering on the surface roughness of zirconia and the micro-tensile bond strength of a pressable veneering ceramic to zirconia. Pre-sintered zirconia blocks (IPS e.max ZirCAD, Ivoclar) were divided into four test groups of three specimens each and a control group ('CTR'; no surface treatment). Pre-S-30, Pre-S-50, and Pre-S-110 were grit-blasted with 30-µm SiO -coated Al O , 50-µm Al O and 110-µm Al O particles, respectively, before sintering. Post-S-30 was grit-blasted with 30-µm SiO -coated Al O after sintering. For each treatment, the surface roughness was measured (Ra, Perthometer M4P, Mahr Perthen). After sintering the zirconia blocks, a liner was applied and a pressable ceramic (IPS e.max ZirPress, Ivoclar) was heat-pressed. Sixteen microbars were obtained from each block and submitted to micro-tensile bond-strength (µTBS) testing. Data were analyzed with one-way ANOVA. Any correlation between Ra and µTBS was evaluated (Sperman test). Grit-blasting before sintering with 110-µm Al O (Ra = 3.4 ± 0.4 µm), 50-µm Al O (Ra = 2.3 ± 0.5 µm), and 30-µm SiO -coated Al O (Ra = 1.2 ± 0.2 µm) resulted in significantly higher roughness than grit-blasting after sintering with 30-µm SiO -coated Al O (Ra = 0.5 ± 0.1 µm). The highest µTBS was measured when the sintered zirconia was grit-blasted with 30-μm SiO -coated Al O (µTBS = 28.5 ± 12.6 MPa), which was significantly different from that of specimens that were grit-blasted before sintering (µTBS = 21.8 ± 10.4; µTBS = 24.1 ± 12.6; µTBS = 26.4 ± 14.1) or were not grit-blasted (µTBS = 20.2 ± 11.2). Grit-blasting zirconia before sintering enhanced the surface roughness proportionally to the particle size of the sand used. Grit-blasting with 30-µm SiO -coated Al O after sintering improved bonding of the veneering ceramic to zirconia. : As grit-blasting with 30-µm SiO -coated Al O after sintering improved bonding of the veneering ceramic to zirconia, it may reduce veneering ceramic fractures/chipping.