Electrochemical corrosion of metals used in orthodontics - 28/02/08
Zakaria BENTAHAR [1],
Farid BOURZGUI [2],
Mustapha ZERTOUBI [3],
Soukaïna El ADIOUI- JOUNDY [4]
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The aim of this study is to review the electrochemical behaviour of orthodontic wires in stainless steel and nickel titanium (NiTi) and to observe surface changes.
Five patients, consulting for correction of dental malpositions, were treated using metallic materials, namely, stainless steel and NiTi. Saliva and blood samples were taken before placement of the appliances and 3 months after in order to calculate the level of nickel by flame-emission spectrophotometry. In parallel, the electrochemical behavior of the stainless steel and NiTi wires was analysed in the laboratory. During a second phase, surface observations and surface chemical analyses were performed by scanning electron microscope (S.E.M.) on samples of unused stainless steel and NiTi wires as well as on those retrieved from the clinical study and the laboratory tests.
In the majority of cases, the levels of Ni released into the blood and saliva remained lower than the standard toxic doses. NiTi alloy demonstrated a higher resistance to corrosion as compared with steel.
Keywords:
Orthodontics
,
Electrochemical corrosion
,
Alloys
,
Bio-compatibility
Plan
© 2005 Elsevier Masson SAS. Tous droits réservés.
Vol 3 - N° 1
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