Evaluation of NiTi wire roughness when exposed to fluoridated solution





Orthodontic wires; Saliva; Fluorine.


There is a concern about the nickel-titanium (NiTi-)-based wires due their content and potential release of nickel, mainly when they are exposed to fluoride. Therefore, the aim of this study was to evaluate the roughness of NiTi-based wires used in orthodontic treatment when exposed to fluoridated solution. The wires were divided in groups according their composition (Flexy NiTi Super Elastic, Flexy NiTi Thermal 35°, Flexy NiTi Copper e Flexy Blue-Ti), time (0 day – T0, 7 days – T1, 14 days – T2, and 28 days – T3) and immersion (artificial saliva solution or artificial saliva containing fluoride). To the roughness assay, straight sections (24 mm) of each wire were used, under constant speed of 0.25 mm/s, measurement length of 2.5 mm and cut-off value of 0.25 mm. The value of surface roughness was obtained by the average of three measurements of each wire. To check data normality the Kolmogorov-Smirnov test was applied, followed by analysis of variance to compare the difference between time and Student t-test to compare the difference of time to each group and intergroup. There was no statistically significant difference of the roughness intra- and intergroup between different composition, time nor immersion. The use of 0.2% fluoride once a week did not cause significant changes in the surface characteristics of studied wires.


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How to Cite

Santos, L. L. dos ., Paloco, E. A. C., Berger, S. B., Dias, F. A., Giuliangeli, D. F., Santos, J. G. M. dos ., Pizzurno, L. G. D. A., & Guiraldo, R. D. (2020). Evaluation of NiTi wire roughness when exposed to fluoridated solution. Research, Society and Development, 9(11), e559119480. https://doi.org/10.33448/rsd-v9i11.9480



Health Sciences