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The objective of the article is to study surface
topographic changes and nickel release in lingual orthodontic
archwires in vitro. Stainless steel (SS), nickel–titanium
(NiTi) and copper–nickel–titanium (CuNiTi) lingual
orthodontic archwires were studied using atomic absorption
spectrometry for nickel release after immersion in a
saline solution. Surface roughness changes were measured
using atomic force microscopy. Differences between
groups were analyzed using independent sample t-tests.
Statistically significant changes in roughness were seen in
all archwires except NiTi. Surface changes were most
severe in the CuNiTi alloy. SS archwires released the
highest amount of nickel. In conclusion, only roughness
changes in CuNiTi archwires seemed to be clinically significant.
The amount of nickel released for all archwires
tested is below the levels known to cause cell damage.
CitationSuárez, C. [et al.]. In vitro evaluation of surface topographic changes and nickel release of lingual orthodontic archwires. "Journal of materials science. Materials in medicine", Febrer 2010, vol. 21, núm. 2, p. 675-683.
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