In vitro corrosion resistance of titanium made using different fabrication methods.
In vitro corrosion resistance of titanium made using different fabrication methods.
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DOI：
10.1016/s0142-9612(98)00160-4
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发表时间：
1999
期刊：
影响因子：
14
通讯作者：
Zhuo Cai;Hiroshi Nakajima;M. Woldu;Anders Berglund;Maud Bergman;Toru Okabe
中科院分区：
文献类型：
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作者：
Zhuo Cai;Hiroshi Nakajima;M. Woldu;Anders Berglund;Maud Bergman;Toru Okabe
采用动电位阳极极化和浸泡试验研究了不同表面条件下铸造和研磨的ASTMⅱ级CP钛的腐蚀性能。用三种牙科钛铸造系统和加工钛制作标本。试验了三种表面条件：(1)喷砂，表面反应层保留；(2)抛光表面无表面反应层；(3)喷砂表面无表面反应层。采用酸性盐水溶液（0.1m乳酸/0.1m NaCl [pH=2]）和人工唾液作为腐蚀介质。阳极极化开始于低于静电位50mV，结束于+2250mV vs Ag/AgCl。在浸泡试验中考察了两种表面条件（表面喷砂有反应层和抛光没有反应层）。试件在37℃腐蚀介质中浸泡6个月。用原子吸收分光光度计对回收溶液进行钛溶出分析。在两种介质中，所有样品都观察到偏振图上一个独特的被动区域，范围从~ 0到~ +1300mV。喷砂试样的初级无源电流密度和无源区域均大于抛光试样。在所有喷砂表面的样品中，电流密度峰值在~ +1600mV处，而抛光样品的电流密度峰值则不那么明显。在酸性盐水溶液中浸泡试验表明，抛光后的样品之间没有显著差异。与抛光试样相比，喷砂试样表面反应层残留的钛溶解量显著增加（P<0.05）。不同熔模材料和不同铸造方法对喷砂试样表面反应层的影响也有显著差异。6个月后，并没有在所有的人工唾液样本中发现可测量的钛含量。铸态CP钛的腐蚀行为与加工态CP钛的腐蚀行为相似。在本实验条件下，表面粗糙度比表面反应层对CP钛极化行为的影响更为显著。表面粗糙度和表面反应层的存在都会影响钛的溶解。
The corrosion of cast or milled ASTM Grade II CP titanium with different surface conditions was studied by potentiodynamic anodic polarization and immersion testing. Specimens were fabricated using three dental titanium casting systems and from machined titanium. Three surface conditions were tested: (1) sandblasted with surface reaction layers remaining; (2) polished surface without surface reaction layers; and (3) sandblasted surface without surface reaction layers. An acidic saline solution (0.1m lactic acid/0.1m NaCl [pH=2]) and an artificial saliva were used as the corrosion media. Anodic polarization was performed starting at 50mV below the rest potential and terminating at +2250mV vs Ag/AgCl. Two surface conditions (sandblasted with the surface reaction layers and polished without such layers) were examined in the immersion test. Specimens were immersed in the corrosion media at 37°C for six months. The recovered solution was analyzed by an atomic absorption spectrophotometer for titanium dissolution. A distinctive passive region on the polarization diagram, ranging from ∼0 to ∼+1300mV, was observed for all specimens in both media. Great similarity was observed for all the sandblasted specimens which had larger primary passive current densities and passive regions compared to the polished ones. A current density peak at ∼+1600mV seen for all the specimens with sandblasted surfaces was less well defined for the polished specimens. Immersion testing in the acidic saline solution revealed no significant differences among the polished specimens. A significant increase (P<0.05) in titanium dissolution was found for the sandblasted specimens with surface reaction layers remaining on the surfaces made with phosphate-bonded SiO2/Al2O3investment compared to the polished ones. Significant differences were also found between sandblasted specimens with the surface reaction layers resulting from different investment materials and different casting methods. Measurable amounts of titanium were not found for all specimens in the artificial saliva after six months. It is evident that the corrosion behavior of cast CP titanium is similar to that of machined titanium. The surface roughness appears to be a more prominent factor than do the surface reaction layers on the polarization behavior of the CP titanium under the present experimental conditions. Surface roughness and the presence of the surface reaction layers both affect the dissolution of titanium.