Investigation of Bond Strength between Antibacterial HA and Ti

Objectives: To evaluate the bond strength between Ti and the HA coating material which contains silver and was proved to be antibacterial and noncytotoxic in previous studies. Methods: Ti coated with HA which contained silver-zirconium phosphate antimicrobial were fabricated by vacuum plasma spraying. The specimen sticks, 25.4 mm in diameter, were separated into four groups according to the antimicrobial content. Group A(control): 0% silver-zirconium phosphate antimicrobial was contained (n=5). Group B: 2% antimicrobial was contained (n=5). Group C: 5% antimicrobial was contained (n=5). Group D: 10% antimicrobial was contained (n=5). The tensile bond strength test was performed using ASTM-633 method. Ultimate tensile bond strength (MPa) data were analyzed with 1-way ANOVA (alpha =0.05). Results: The bond strengths (MPa) were: 20.00±2.00 for Group A; 23.00±1.90 for Group B; 24.50±1.80 for Group C; 27.00±2.67 for Group D. The data increased from Group A to Group D. Mean bond strength for Group A was significantly lower than that for the other 3 groups. There was significant difference between Group B and Group D. But Mean bond strengths for Group B and C, Group C and D were not significantly different. Conclusions: The tensile bond strength of HA to Ti becomes higher after the silver-zirconium phosphate antimicrobial was incorporated. The strength increases when the antimicrobial content is raised.