Title:
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Effect of temperature on the orthodontic clinical applications of NiTi closed-coil springs
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Author:
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Espinar, Eduardo; Llamas Carreras, Jose Maria; Barrera Mora, Jose Maria; Ábalos, C.; Gil Mur, Francisco Javier
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. BBT - Biomaterials, Biomecànica i Enginyeria de Teixits |
Abstract:
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NiTi spring coils were used to obtain large deformation under a constant force. The device consists on a NiTi coil
spring, superelastic at body temperature, in order to have a stress plateau during the austenitic retransformation
during the unloading. The temperature variations induced changes in the spring force.
Objectives: The aim of this study is to investigate the effect of the temperature variations in the spring forces and
corrosion behaviour simulating the ingestion hot/cold drinks and food.
Study
D
esign: The springs were subjected to a tensile force using universal testing machine MTS-Adamel (100 N
load cell). All tests were performed in artificial saliva maintained at different temperatures. The corrosion tests
were performed according to the ISO-standard 10993-15:2000.
Results: The increase in temperature of 18
o
C induced an increase in the spring force of 30%. However, when the
temperature returns to 37
o
C the distraction force recovers near the initial level. After cooling down the spring to
15
o
C, the force decreased by 46%. This investigation show as the temperature increase, the corrosion potential
shifts towards negative values and the corrosion density is rising.
Conclusions: The changes of the temperatures do not modify the superelastic behaviour of the NiTi closed-coil
springs. The corrosion potential of NiTi in artificial saliva is decreasing by the rise of the temperatures. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria dels materials -Nickel-titanium alloys -Orthodontics -Coils -NiTi -Orthodontic -Recovery -Springs -Superelasticity -Temperature -Níquel-titani -- Aliatges -Ortodòncia |
Rights:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Document type:
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Article - Published version Article |
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