[Study of the bonding strength of pure titanium and light-cured hard crown and bridge composite after filming by TiSiN].

OBJECTIVE: To evaluated the bonding strength between pure titanium and Solidex after deposition by magnetron sputtering TiSiN with different content of Si (9%, 19%) and analyzed the surface component by electron probe micro-analysis (EPMA). METHODS: All pure titanium samples divided into 3 groups according to different surface treatment, then bonded with Solidex light-cured composite. Material test machine was used to measure bonding strength and the surface was analyzed by EPMA. RESULTS: The bonding strength of deposition with TiSiN groups were higher than unfilming group, increasing the content of Si could enhance the bonding strength between pure titanium and Solidex in TiSiN groups (P < 0.05). EPMA showed amorphous materials like TiN, SiN gathered on the surface in TiSiN groups. There were obvious interspaces between unfilming pure titanium and Solidex, contrary no interspaces was observed in TiSiN groups. CONCLUSION: The bonding strength of filming groups was higher than unfilming group, amorphous material like TiN, SiN gathering on the surface may prevent the microleakage and stop metal ion leaking.

[Study of TiN plating coat on increasing shear bond strength].

PURPOSE: To investigate the feasibility of increasing bond strength of polymer ceramic to titanium using TiN coating. METHODS: Twelve pure titanium specimens were casted and divided into two groups randomly. In one group,the surface was processed with conventional handling,in the other group,the surface was coated with TiN. Then the specimens in each group was bonded with polymer ceramic material (Ceramage). The shear bond strength was measured using parallel interface shearing. The interface between polymer ceramic and titanium was observed under SEM. Two samples t test was conducted with SPSS11.0 software package. RESULTS: The shear bond strength of TiN plating coat group was (29.78+/-0.78)MPa, larger than that of the conventional handling group (25.73+/-0.37)MPa, the difference was significant (P<0.01) between the two groups, and both of them exceeded ISO9693:1999(P<0.01). CONCLUSION: TiN plating coat can effectively improve the shear bond strength.