Influence des variations de température rencontrées dans la cavité buccale sur les propriétés physiques des arcs orthodontiques à base de nickel-titane

Abstract : This study aims to characterize ten of the most commonly used .017x.025 in. NiTi archwires and to test the influence of temperature on their structure and mechanical properties. Archwires height and width are below nominal values. Surface characteristics are diverse. Two different compositions are identified : the nearly equiatomic NiTi alloys, and the Copper NiTi alloys. The diverse transition types and temperatures defined by differential scanning calorimetry (DSC) confirm the heterogeneity of our sample. X-ray diffraction of the Neosentalloy 100gR and Copper NiTi 35°CR wires confirms the two and one-step transitions displayed by these wires in DSC. Torsional properties are temperature-dependent. Most archwires do not display superelasticity at the mean buccal temperature of 35°C.
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Yves Bolender. Influence des variations de température rencontrées dans la cavité buccale sur les propriétés physiques des arcs orthodontiques à base de nickel-titane. Autre. Université Henri Poincaré - Nancy 1, 2008. Français. ⟨NNT : 2008NAN10144⟩. ⟨tel-01777261⟩

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