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NiTi superelastic orthodontic wires with variable stress obtained by ageing treatments
Gil Mur, Francisco Javier; Cenizo, M.; Espinar, Eduardo; Rodríguez Contreras, Alejandra María; Rupérez de Gracia, Elisa; Manero Planella, José María
Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. BIBITE - Biomaterials, Biomecànica i Enginyeria de Teixits; Universitat Politècnica de Catalunya. CDAL - Centre de Disseny d'Aliatges Lleugers i Tractaments de Superfície
A new strategy to obtain NiTi orthodontic archwires with variable correcting stresses in different segments is presented. Different heat treatments are applied in selected segments, which produce variations in the superelastic properties. These allow to modulate the correcting stresses to the requirements of the specific teeth. This method avoids laser welding, which is associated with corrosion and brittleness problems. The aim of this study is to analyze the effect of the heat treatment by zones on transformation temperatures, and stresses in NiTi orthodontic archwires with identical chemical composition. A reduction of the Ti content is observed, in the matrix of the posterior segment, due to the formation of Ti2Ni precipitates. This produces a decrease of the transformation temperatures and consequently an increase of correction stresses. The changes are smaller in the lateral segment due to the lower temperature reached. No changes are observed in the anterior segment in relation to the original archwire. The titanium-rich precipitates undergo observation and characterization by Transmission Electron Microscopy (TEM) and electron diffractio
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria dels materials
Nickel-titanium alloys
Orthodontics, Corrective
Orthodontic archwires
Shape memory alloys
Níquel-titani -- Aliatges
Ortodòncia correctora
Attribution-NonCommercial-NoDerivs 3.0 Spain

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