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Year : 2018  |  Volume : 10  |  Issue : 5  |  Page : 224-228

Nickel, copper, and chromium release by CuNi-titanium orthodontic archwires is dependent on the pH media

Department of Dental Materials, São Leopoldo Mandic Research Institute, Campinas, São Paulo, Brazil

Correspondence Address:
Prof. Roberta Tarkany Basting
São Leopoldo Mandic Research Institute, Department of Dental Materials, Rua José Rocha Junqueira, 13, Bairro Swift, Campinas, São Paulo
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jioh.jioh_186_18

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Aim: The aim of this study was to evaluate the concentrations of nickel (Ni), copper (Cu), and chromium (Cr) ions released by Ni archwires with the addition of Cu to their composition CuNi-titanium in neutral and acid media. Materials and Methods: The 0.016” cross-section heat-activated archwires evaluated were Ni titanium (Ti) Memory Wire (American Orthodontics), Damon Optimal-Force Cu Ni-Ti (Ormco), Tanzo Cu NiTi (American Orthodontics), and Flexy NiTi Cu (Orthometric). Ten archwires were used from each commercial brand, obtaining two segments measuring 2 cm (centimeters) from the most posterior portion of the archwires. The archwires remained immersed in neutral or acid solutions for a time interval of 7 days. The samples were analyzed by Graphite Furnace Atomic Absorption Spectrometry to evaluate Cr and by Inductively Coupled Plasma Atomic Emission Spectrometry to evaluate Ni and Cu. Two-Way Analysis of Variance (ANOVA) and the Tukey tests were applied to the data. Results: The immersion of the NiTi Memory Wire and the Flexy NiTi Cu archwires in both solutions presented significantly higher mean Ni concentration values than the other archwires (P = 0.0001). The immersion of the Tanzo Cu NiTi and the Flexy NiTi Cu archwires in the neutral solution yielded a higher concentration value for detectable Cu than that of the other groups (P = 0.0055). In the acid solution, only Damon Optimal-Force Cu Ni-Ti presented no experimental segment with detectable Cu concentration. Cr release could not be quantified. Conclusions: Metal ion release by archwires is dependent on the commercial brand and the immersion solution.

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