Evaluation of Nickel Ion Release from Orthodontic Wires in Different Types of Artificial Saliva.pdf

Aims: To evaluate the amount of nickel ion release from stainless steel orthodontic wires in differentartificial saliva and in different time periods. Materials and Methods: This study included six differentcommercial stainless steel orthodontic wires with different diameters. They wereimmersed in deionized water (control) and three different artificial saliva, the immersion periodsincluded 7, 14, and 30 days. A graphite-furnace atomic absorption spectrometer (AAS) was used todetermine the amount of nickel ions release. Results: The statistical analysis showed that there is ahighly significance in the release of nickel ions for all types of wire except wires 0.18, and 0.16 x 0.22which gave non-significant 2.45 and 1.37 respectively, and the time period of immersion had nosignificant effect in all types of wire. Conclusions: The release of nickel ions was influenced by thetypes of wire and the surface areas that in contact with immersion in solution, in addition to thecomposition of the orthodontic wires, but this were not proportional to the content of metal in the wire.Key words: Nickel ion, arch wires, fixed orthodontic appliance.