矯正用金属製装置の異種金属接触腐食挙動に関する研究 : 生理食塩水中における腐食電位の測定

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The free corrosion potential of commercially available orthodontic appliances was measured in 0.9% NaCl solution to assess the galvanic corrosion that can be observed when more than two metallic appliances with different compositions are in contact with each other in oral environments. Eight kinds of metallic brackets, twenty one kinds of archwires, and four kinds of coil springs were employed in this study. The compositions of the specimens were determined using an energy dispersive X-ray fluorescence analyzer. The free corrosion potential in the 0.9% NaCl solution at 37℃ was measured for 168 h (7 days) using an electrometer. Comparing the corrosion potential values of the archwires after the 168 h-immersion, stainless steel wires exhibited the highest (noblest) value, followed by Co-Cr-Ni alloy wires, Ni-Ti alloy wires, and β-Ti alloy wires. The corrosion potential of the coil springs made of stainless steel and twisted stainless steel wire was lower (less noble) than that of the stainless steel arch wires. There was a statistically significant difference in the corrosion potential values of stainless steel brackets with similar compositions. Single piece type brackets had higher corrosion potentials than two piece type brackets made by soldering or welding. The remarkably low corrosion potential value of the two piece type brackets suggests that the contact point between wing and base is a corrosion susceptible site when these brackets are used in contact with the archwires employed in this study. Considering galvanic corrosion, Ti brackets are recommended because Ti brackets would be anodic with respect to most archwires and would protect the wires they are in contact with from corrosion, resulting in a reduced amount of allergenic metal ions such as Ni, Co, and Cr ions released.
2004-12-31

矯正用金属製装置の異種金属接触腐食挙動に関する研究 : 生理食塩水中における腐食電位の測定

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