Naslov
Determination of corrosion rate of orthodontic wires based on nickel-titanium alloy in artificial saliva

Autori
Katić, Višnja ; Ćurković, Lidija ; Ujević Bošnjak, Magdalena ; Špalj, Stjepan

Izvornik
Materialwissenschaft und Werkstofftechnik (0933-5137) 45 (2014), 2; 99-105

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
NiTi orthodontic wires ; corrosion rate ; inductively coupled plasma-optical emission spectroscopy (ICP-OES)

Sažetak
The goal of this study was to determine corrosion behavior of three orthodontic wires based on nickel-titanium alloy (NiTi) in artificial saliva at temperature of 37 °C as function of immersion time. Following orthodontic wires were used: uncoated (NiTi), rhodium coated (Rh NiTi) and nitrified (N NiTi) orthodontic wires. Corrosion of investigated orthodontic wires were monitored by measuring of Ni2+ and Ti4+ ions released in artificial saliva by inductively coupled plasma- optical emission spectroscopy (ICP-OES) after 3, 7, 14, 21 and 28 days of immersion. Obtained results indicate that corrosion reaction of the NiTi wires in artificial saliva follows the parabolic rate law. According to the obtained values of parabolic corrosion rate constants, corrosion susceptibility of orthodontic wires decreases in the following order: Rh NiTi wire (Kp = 2.48 μg2/cm4 h) > NiTi wire (Kp = 1.6 × 10–3 μg2/cm4 h) > N NiTi wire (Kp = 6.0 × 10–4 μg2/cm4 h). These results indicate that in comparison with uncoated NiTi wire, rhodium coating significantly increases corrosion susceptibility, while nitrification effectively suppresses the release of Ni2+ and Ti4+ ions.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Strojarstvo, Dentalna medicina

Napomena
Rad izrađen u sklopu projekta Sveučilišta u Rijeci 13.06.2.1.53

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