The Effect of Surface Condition and Solution Composition on the Repassivation Behavior of Titanium Studied by PRM in Vitro

摘要

Air formed oxide films, passive films, on titanium and its alloys play a very important role in biocompatibility and corrosion resistance, therefore titanium related products are used in the medical field. The oxide films are sometimes removed or destroyed mechanically or chemically during service. The oxide film breakdown may then be a cause of further, continuous dissolution of the underlying metals, and as metals are dissolved in vitro, the local increase in metal ion concentrations may induce cell death near the dissolving metals. Therefore, many papers have investigated corrosion or the electrochemical behavior of metals, mainly titanium alloys in vitro and in vivo (1-9). Sakairi et al. have reported the very initial stage of repassivation kinetics by a laser irradiation technique (1). Karthega et al. reported on the electrochemical behavior of ss -titanium alloys in Hank's solutions (3). Cheng et al. studied crevice corrosion resistance of NiTi in Hanks' solutions (4). Reclaru et al. reported corrosion in the presence of titanium implants and dental alloys (6). Handzlik et al. reported on the electronic properties of anodic oxide films formed on titanium in phosphate buffered saline solution and artificial saliva (9).rnUnderstanding the repasivation kinetics is very important for understanding corrosion and protection of metals, both in dental and other applications. Therefore, there are many papers related to repassivation behavior using mechanical oxide film stripping techniques (10, 11). Conventional mechanical oxide film stripping techniques, however, suffer from disadvantages, such as slow rates of stripping, contamination of exposed surfaces from the stripping tools, and stresses and strains on the substrate during film stripping. In the last 16 years, there are reports of film stripping by focused pulsed Nd-