TITLE

Effect of Recycling and Autoclave Sterilization on the Unloading Forces of NiTi Closed-Coil Springs: An In Vitro Study

AUTHOR(S)
Momeni Danaei, Sh.; Oshagh, M.; Khozaei, A.
PUB. DATE
December 2013
SOURCE
Journal of Dentistry (17283426);Dec2013, Vol. 14 Issue 4, p184
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Statement of Problem: Clinicians use the NiTi coil springs frequently for its appropriate mechanical properties. Purpose: The aim of this study was to determine the effect of recycling and autoclave sterilization on the unloading forces of NiTi closed coil springs. Materials and Method: Fourteen NiTi closed coil spring with the length of 9mm were selected. Each coil was stretched to a peak extension of 12 mm. A universal testing machine was used to acquire load/deflection curve of the coil springs at 25±2°C. The influence of thermocycling (1000 cycles,5-55°C), autoclaving (134°C, 32PSI, 3min) and mechanical strain (9mm extension) which simulated the oral condition, were considered. Data were statistically analyzed by adopting Repeated Measures MANOVA Paired t-Test. Results: Autoclaving in the 1, 4, 6 steps increased the force levels of coil springs about 2- 5gf (p< 0.01). Thermocycling reduced their force levels about 4-6gf. Prolonged strain at 3, 5 steps decreased the magnitude of forces levels about 3-4gf. Conclusion: Concerning all the limitations; according to the results of this study; it is possible to recycle Ni-Ti closed-coil springs without significant reduction in their force levels.
ACCESSION #
91966931

 

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