钛表面预处理对钛-瓷剪切结合强度影响的研究

目的　探讨不同的钛表面预处理对自制新型镧系低熔瓷的钛-瓷结合强度的影响,为自行研制钛瓷瓷粉体的临床应用奠定理论基础。方法　钛表面分别经不同粒度的Al2O3喷砂粗化、偶联剂处理及预氧化处理;制作棒、盘试件,用压出法测试钛-瓷间的剪切结合强度,用扫描电子显微镜(SEM)及电子探针(EPMA),从微观和相关元素方面观察钛-瓷界面。结果　80~250μm 5种不同粒度的Al2O3喷砂处理钛表面后,对钛-瓷剪切结合强度无明显影响;自制硅偶联剂使剪切结合强度降低;钛表面预氧处理对剪切结合强度无明显影响。结论　镧系低熔瓷对钛表面具有良好的湿润性;钛金属表面硅偶联剂处理或预氧化处理是不必要的;在一定范围内,剪切结合强度受钛表面粗糙度的影响较小。

The Influence of Surface Conditioning on the Shear Bond Strength of La-Porcelain and Titanium

OBJECTIVE: To determine the influence of different surface conditioning methods on bonding strength of low fusing porcelain (La-Porcelain) and titanium. METHODS: The surface of the samples were sandblasted for 2 min with 80-250 microns Al2O3 or coated for two times with Si-couple agent or conditioned by pre-oxidation. The shear bond strength was examined by push-type shear test with a speed of 0.5 mm/min in a universal testing machine. Scanning electron microscopy (SEM) and electron probe micro-analyzer (EPMA) were employed to explore the relationship between bonding strength and microstructures, as well as the element diffusion at the interface between porcelain coating and titanium when heated at 800 degrees C. RESULTS: Bonding strength was not statistically different (P > 0.05) after sandblasting with Al2O3 in particle size ranged from 80 microns to 250 microns. When a Si-couple agent was used, bond of porcelain to titanium was significantly lower (P < 0.05). The shear bond strength of the porcelain to the pre-oxidized titanium surface remained unchanged after heating (P > 0.05). The SEM results revealed integrity of porcelain and titanium. CONCLUSION: La-Porcelain showed a small effect of surface coarseness. Sandblasting the titanium surface with 150-180 microns Al2O3 can be recommended as a method for better bonding between La-Porcelain and titanium. The Si-couple agent coating and pre-oxidation of titanium surface is unnecessary.