Effect Of Surface Treatments On Zirconia-Titanium Bond Strength

This study evaluates the influence of different surface treatments on the bond strength between 3D-printed zirconia and titanium using two resin cements, both immediately and after thermal aging. 3D-printed zirconia cylinders were divided into four groups: control (no treatment), sandblasting, micropore (depth: 0.04 mm, diameter: 0.4 mm, spacing: 0.1 mm), and pretreatment liquid application. Titanium discs were sandblasted before bonding. Two resin cements, GC CEM ONE and Clearfil SAC, were used for bonding. Shear bond strength was measured immediately and after thermal aging (20,000 cycles, 5°C-55°C). Statistical analysis was performed using two-way ANOVA (α=0.05). Immediately after bonding, SAC cement exhibited higher bond strength than GC cement across all groups. The micropore group showed the highest values for both cements (p<0.05). After thermal aging, all groups experienced a significant decrease in bond strength, but GC cement demonstrated greater stability than SAC. Among the surface treatments, the micropore group maintained the highest bond strength after aging (p<0.05). In contrast, the pretreatment liquid group exhibited the weakest bonding performance, especially after aging. While SAC cement initially provided higher bond strength, GC cement demonstrated better durability after aging. The micropore treatment was the most effective in maintaining bond strength over time, suggesting its potential for enhancing long-term zirconia-titanium bonding stability.