| Titanium and Titanium alloy's high output, extensive source, and low price make them promising dental metal materials. But the color of Ti and Ti alloy are silver gray, not as aesthetic as precious metals. Through the application of surface plasma coating technique, denture looks golden, which improve Ti and Ti alloy prosthesis aesthetic result. This thesis systematically studied the influence of TiN Filtered Cathode Vacuum Arc(FCVA)coating technics and its factors to Ti surface performance. The purpose is to increase Ti denture surface quality and machining efficiency, improve Ti denture aesthetic effect, save as theoretic basis for clinical application.1.the technics process of Filtered Cathode Vacuum Arc coatingEach sample was rinsed with ethanol and aether, then washed in an ultrasonic bath for 15 min. Put samples to the jig of plasma plating machine, close the port and vacuum the house to 8×10-3 Mpa. Samples were rinsed with argon and heated for 30min(temp30~60℃). Using Filtered Cathode Vacuum Arc to generate the plasma of nitrogen, a coating is formed in 30min. Different colored coating, from dark golden to tint golden can be generated with different coating condition.2. the performance measurement of TiN FCVA coating TiFive Ti coating samples'reflectivity was measured with DataColor SF-300. CIE1976L*a*b* color measurement everage values under D65 was calculated with SCT-DT2000 For Windows software and compared with 24K gold surface color value. The result showed that red and green chroma difference is tiny, brightness is darker, tone is yellow, totally with no significant chromaticabeeration. Scanned electronic microscope photos showed the coating is level off and bonds well to Ti base, thickness is about 1.2μm.3.the experiment study of TiN FCVA coating-Ti bond strengthNick experiment is not adaptable to evaluate TiN FCVA coating-Ti base bond strength due to its thin thickness of TiN FCVA coating. Pressing experiment results were evaluated according to German engineering handbook (VDI3198) pressing bond strength evaluation standard. Results suggested that TiN FCVA coating has enough bond strength to pure Ti base. It can be conferred that TiN FCVA coating can be clinically applied to Ti framework dental prosthesis.4.the cell virulence study of TiN FCVA coating TiBased on GB / T16886 standard, MTT method was used to evaluate Ti FCVA.TiN coating cell virulence. Experiment results were analysed with Multi-factor ANOVA, cell growth status in different groups and different periods were observed with telescope. The results showed that TiN FCVA coating Ti samples have the same cell consistency as blank Ti sample. TiN FCVA coating Ti samples keeps excellent bio-consistency of pure Ti and no deleterious matter dissolved from TiN FCVA coating Ti samples.5.The study of Color stability of TiN FCVA coatingThe color stability of TiN FCVA coating was studied before and after the surface of Ti was treated with tooth brush machine in six month . A chromameter was used to evaluate color in CIE1976L*a*b system.the result demonstrated there are no statically differences in value of L*a*b* (P>0.05) . It is concluded that TiN FCVA coating is acceptable from the standpoint of color stability for a relative long-term abrading.6. The influence of FCVA film on the surface roughness of titaniumThe surface roughness of titanium were measured before and after the FCVA_treatment to evaluate the influence of FCVA film on the surface roughness of titanium.. Results show there is no statically difference in the surface roughness of titanium before and after the treatment(P>0.05). this means FCVA treatment used to form a gold-like film on the surface of titanium domaintain the original surface qualities.7. Preliminary observation of coloring performance on cast titanium denture... |
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