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. 2013 Jul 1;18(4):e721-4.
doi: 10.4317/medoral.19073.

Effect of temperature on the orthodontic clinical applications of NiTi closed-coil springs

Eduardo Espinar-Escalona  1 , José-María Llamas-Carreras, José-María Barrera-Mora, Camilo Abalos-Lasbrucci, Francisco-Javier Gil-Mur
Affiliations

Effect of temperature on the orthodontic clinical applications of NiTi closed-coil springs

Eduardo Espinar-Escalona et al. Med Oral Patol Oral Cir Bucal. .

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 design: 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 °C induced an increase in the spring force of 30%. However, when the temperature returns to 37 °C the distraction force recovers near the initial level. After cooling down the spring to 15 °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.

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Figures

Figure 1
Figure 1
Mechanical test simulating a hot ingestion of food/beverage.
See this image and copyright information in PMC

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