Measurement the Chemical Composition and Topography of Copper Nickel Titanium Arch Wires at Dry and Wet conditions (An In-Vitro Study)

Abstract

Background: The characteristics surface, such as, topography, and rigidity of orthodontic arch wires are
essential determining factor of the effectiveness,of arch wire-guided tooth movement. They also affect,
in the potential of corrosion,and the aesthetics,of orthodontic components. This study was considered to
evaluate the chemical composition and topography of Cu-NiTi arch wires from different companies in,dry
and,wet condition( acidic and,neutral artificial saliva). Materials and methods Three,types of CuNiTi
orthodontic,archwires from,different brands were,used: CuNiTi (Ormco brand),, CuNiTi (IOS brand)
and,CuNiTi (Orthotechnology brand).,They were rectangular,(0.018*0.025 inch) in cross,section and cut
into pieces,of 20 mm in length.,30 pieces,from each,company were separated into 3 groups; one group was
left dry condition,and other,2 groups, ten pieces,for each group were submerged in,artificial saliva,(pH=6.75
± 0.015) and,(pH=3.5 ± 0.015) at 37ºC ,for 2 months. The SEM and EDS was used to assess surface analysis
of wholly samples.,Results: After soaking period, CuNiTi wires from orthotechnology brand,exhibited the
highest change in chemical composition and topography among the study groups. Instead, the least change
in chemical composition and topography surfaces were CuNiTi wires from Ormco brand,when compared
to,analogous arch wires. Conclusion: The CuNiTi arch wires from Ormco brand were the greatest and the
most appropriate alignment in orthodontic archwires in term of the least changes in surface of Cu-NiTi
initially and during the course of this study period.