Comparative Study of the Release of Corrosion Products from Stainless Steel Immobilization Wire and Arch Bar during Uniform Attack in Bio-fluids
Comparative Study of the Release of Corrosion Products from Stainless Steel Immobilization Wire and Arch Bar during Uniform Attack in Bio-fluids
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Date
2012-11
Authors
Omoniyi, K. l
Ekwumemgbo, A. P.
Yahaya, I. A.
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Abstract
This study compares the amount of released Co, Fe, Mn, Ni and Cr ions from stainless steel immobilization (SSI) wire and arch bar into five pseudo- and actual- bio-fluids of varying pH and chloride ion level, under various incubation time using atomic absorption spectroscopy. Co ion was not released from SSI until at 4 weeks immersion time in WBS (0.019 ± 0.001 μg/ml) and PBS (0.023 ± 0.002 μg/ml, while arch showed resistance till at 6 week of immersion. The total amount of Fe ions released into the bio-fluids by arch bar during the immersion testing was 0.360 ± 0.032 μg/mL compared to 6.462 ± 0.103 μg/mL from the immersed SSI wires (1 day to 6 weeks). However, the leaching rate of SSI wire for Fe ions was only slightly higher than of the arch wire. There is significant difference in the amount of nickel, iron and cobalt ions released from SSI wire due to decrease in pH and increased concentration of chloride ions of the immersion solutions, while the variation of pH and chloride ions of the bio-fluids had a significant effect on the amount of Ni, Mn and Cr ions released from arch bar (P ≤ 0.05). The SSI wire demonstrated a double corrosion resistance profile over that of arch wire for Co leaching, with no significant difference in the amount of Co released by SSI and arch wire for the short term test, but Fe ions released was slightly higher for SSI (P ≤ 0.05).
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postprint journal articles
Keywords
Comparative Study, Corrosion Products,, Stainless Steel,, Immobilization Wire,, Arch Bar,, Bio-fluids,