Effect of Treatment by Electro-spark Deposition Technology on Bonding Strength of Porcelain and Pure Titanium
|School||Fourth Military Medical University|
|Keywords||EDM deposition The middle layer Pure titanium Titanium porcelain Bonding strength|
Porcelain fused to metal restorations are widely used in crowns and bridges of Stomatology. Titanium metal with its good corrosion resistance, excellent performance of the biology, physical and mechanical properties and low prices as the base material has been widespread application. However, clinical observations found that titanium Porcelain Repair collapse often appear porcelain, mainly because of the titanium porcelain bonding strength is low. So reinforced titanium ceramic bonding strength can improve the success rate of titanium Porcelain Repair. Is generally considered the combined strength is still low in the case of titanium special ceramic powder titanium porcelain: a strong reduction ability of titanium in the high temperature environment to form a thick porous in the the PFM process of the surface can easily attached to poor oxide film. Many studies have demonstrated by the titanium surface coating treatment to prevent excessive oxidation of titanium at high temperature, thereby enhancing the bonding strength of titanium porcelain. Therefore, this study, using the spark deposition technical preparation of titanium porcelain combined the interface middle layer, and explore the method of bonding strength of titanium porcelain, preferably operating parameters, in order to improve the bonding strength of titanium porcelain, and provide a reference for clinical work. Specific methods and findings are as follows. 1 were silicon, zirconium and cobalt-chromium alloy electrode of titanium specimen by spark deposition techniques for surface treatment, the control group, without being processed, after conventional sandblasting Referring to IS0 9693 (1999) Amd.1 2005 (E) standard in specimen copies porcelain powder sintered Ti-22 titanium porcelain bond strength of three-point bending evaluation detection analysis. The results show that after blasting specimen surface roughness was no significant difference in sex (P gt; 0.05), three-point bending of the silicon electrode group titanium porcelain bond strength is (30.08 ± 1.55) MPa, compared with the other three groups combined with intensity difference was significant (P lt; 0.05) among the three groups titanium porcelain bond strength was no significant difference in sex (P gt; 0.05). Scanning electron microscopy showed that each group of specimens titanium porcelain bonding interface no significant oxide layer, the silicon electrode group, about 15-20 m transition layer between the intermediate layer and the titanium substrate. On the basis of the above experimental silicon as the working electrode, different sandblasting grouping. The results show that the specimen surface roughness differences after sandblasting significant sex (P gt; 0.05), three-point bending strengthen the the sandblasting group 1 of bond strength (32.56 ± 1.34) MPa, higher than the of conventional sandblasting group (29.95 ± 1.49) MPa (P lt; 0.05) and strengthen the the sandblasting group 2 (26.30 ± 1.31) MPa (P lt; 0.05). Scanning electron microscopy showed that there are cracks in the middle layer of the conventional sandblasting group exists, and strengthen the sandblasting group 1, the middle layer of the weak part of the rift has been removed, and strengthen the sandblasting group 2 intermediate layer has been completely removed by sandblasting. Group 3 specimen the titanium porcelain bonding interface were no significant oxide layer, strengthen sandblasting group still visible transition layer between the intermediate layer and the titanium substrate. X-ray diffraction analysis results suggest that the conventional sandblasting group in the intermediate layer of TiN, Ti5Si3, TiSi2 generated to strengthen the Sandblasting group still contained in the intermediate layer of Ti5Si3 and of TiSi2 3 on the basis of previous experiments, electrospark deposition The voltage can be adjusted, compares through the combination for each group of three-point bend strength, screening a suitable working voltage. The results show that the different operating voltage processing, enhanced after blasting the specimen surface roughness was no significant difference in sex (P gt; 0.05). Gradient voltage three-point-bending combination of strength (35.33 ± 2.00MPa), compared with 50V, 70V voltage group and control group difference was significant (P lt; 0.05). By scanning electron microscopy, and the results show the titanium porcelain bonding interface of the specimen were no significant oxide layer. EDS analysis results show that the quality of 50V, 70V or and gradient voltage group of the middle layer of Si element content ratio was 1.24%, 4.12%, 13.03%. Conclusion: 1. Using a silicon electrode to the air as a medium, the electrical parameters (capacitance: 300 F, frequency: 50Hz, voltage: 70V-60V-50V gradient voltage), 100% coverage on the surface of pure titanium casting spark deposition processing, with the strengthening of sandblasting, titanium porcelain bond strength (35.33 ± 2.00MPa) can be significantly improved. EDM deposition technology to prepare the middle layer of titanium surface application in the casting can improve titanium porcelain combined performance, the technology has a certain application prospects.