Observation about the bonding of porcelain fused to nitrogen implanted pure titanium

Objective: To study the effect of nitrogen implantation on the surface of pure titaniunm on the bonding strength of porcelain and titanium. Methods: 20 pure titanium specimens in the size of 28mm×3 mm×0.5 mm were cut by linear cutting machine,divided into nitrogen implantation group (10 specimens) and control group (10 specimens), 10 specimens of implantation group were nitrogen implanted by plasma based ion implantation (PBII), get 1 specimen from two groups respectively, the phase composition of 2 specimens were characterized by X-ray diffraction (XRD). The middle area of 8 mm×3 mm of the other 18 specimens were veneered with porcelain special for titanium. The failure loads were tested in three-point bending test. Results: The TiN was formed in the implantation layer.The bonding strength (7.257±0.804N) of nitrided growp group was higher than that (5.958±0.537N) of control group, and there was a statistically significant difference(P 0.01)between them. Conclusion: The TiN is formed in the implantation layer and the bonding strength of porcelain-titanium was reinforced after titanium was nitrided.