Effect of temperature on the orthodontic clinical applications of NiTi closed-coil springs
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Tipus de documentArticle
Data publicació2013-07-01
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Abstract
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.
CitacióEspinar, E. [et al.]. Effect of temperature on the orthodontic clinical applications of NiTi closed-coil springs. "Medicina oral, patología oral y cirugia bucal", 01 Juliol 2013, vol. 18, núm. 4, p. e721-e724.
ISSN1698-4447
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