Effect of temperature on the orthodontic clinical applications of niti closed-coil springs
Med. oral patol. oral cir. bucal (Internet)
; 18(4): 721-724, jul. 2013. ilus, tab
Article
em En
| IBECS
| ID: ibc-114497
Biblioteca responsável:
ES1.1
Localização: BNCS
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 18oC induced an increase in the spring force of 30%. However, when the temperature returns to 37oC the distraction force recovers near the initial level. After cooling down the spring to 15oC, 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 (AU)
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Coleções:
06-national
/
ES
Base de dados:
IBECS
Assunto principal:
Aparelhos Ortodônticos
/
Temperatura Corporal
/
Ligas Dentárias
Limite:
Humans
Idioma:
En
Revista:
Med. oral patol. oral cir. bucal (Internet)
Ano de publicação:
2013
Tipo de documento:
Article