Naslov
MECHANICAL PROPERTIES AND ION RELEASE FROM NICKEL-TITANIUM WIRES WITH VARIOUS SURFACE COMPOSITIONS IN ARTIFICIAL SALIVA

Autori
Katić, Višnja ; Blagović, Branka ; Ciganj, Zlatko ; Marković, Kristina ; Kamenar, Ervin

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
EOS 2017 Scientific Posters / Rice, David - , 2017, 97-97

Skup
93rd Congress of the European Orthodontic Society

Mjesto i datum
Montreux, Švicarska, 05.06.2017. - 10.06.2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
ion release ; surface roughness ; hardness ; Young’s modulus ; nickel-titanium wires ; coating ; artificial saliva

Sažetak
AIM: To explore ion release, surface roughness, hardness and Young’s modulus from nickel- titanium (NiTi) wires with different coatings in artificial saliva. MATERIALS AND METHOD: Uncoated NiTi, nitride- coated (NNiTi) and rhodium-coated (RhNiTi) nickeltitanium wires were immersed in artificial saliva solutions (1.5 g/l KCl, 1.5 g/l NaHCO3, 0.5 g/l, NaH2PO4– H2O, 0.5 g/l KSCN, 0.9 g/l lactic acid). The pH of the artificial saliva was adjusted to 5.1 with the use of lactic acid and NaOH. Wire specimens were incubated in artificial saliva for 28 days at 37°C. Inductively coupled plasma-optical emission spectroscopy was used for measurement of the released ions. Three parallel experiments were conducted for every wire. The surface roughness (variables: Rq, root mean squared roughness ; Ra, arithmetic average surface roughness ; RZ, maximum height) of the wire samples was measured by the atomic force microscopy on 30 × 30 µm surfaces, whereas Young’s moduli and the hardness were determined by nanoindentation tests performed with a peak load of 20 mN and 100 mN. Data was analysed with ANOVA and Student-Newman-Keuls post hoc test. RESULTS: The release of titanium ions from the RhNiTi was significantly higher when compared to titanium ion release from NiTi and NNiTi (P = 0.020). Significant differences were not found between wire types for nickel ion release. At peak load of 20 mN there were significant differences in hardness between all three wires while at peak load of 100 mN differences were between NiTi and RhNiTi on one side, and NNiTi on the other (all P < 0.001). At a peak load of 20 mN there were significant differences in Young’s moduli between RhNiTi on one side, and NiTi and NNiTi on the other (P < 0.001). At peak load of 100mN no differences were found between wires with various coatings. Significant differences found in surface roughness parameters between RhNiTi on one side, and NiTi and NNiTi on the other (Rq, P = 0.004 ; Ra, P = 0.005 ; Rz, P < 0.001). CONCLUSIONS: Titanium ion release, hardness, Young’s moduli and surface roughness parameters are all influenced by the changes in surface coating.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Strojarstvo, Temeljne tehničke znanosti

Napomena
HRZZ IP-2014-09-7500

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