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Journal of Dentistry, Shiraz University of Medical Sciences، جلد ۱۴، شماره ۴، صفحات ۱۸۴-۰
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عنوان انگلیسی Effect of Recycling and Autoclave Sterilization on the Unloading Forces of NiTi Closed-Coil Springs: An In Vitro Study
چکیده انگلیسی مقاله 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.
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نویسندگان مقاله sh مومنی دانایی | sh momeni danaei
dept. of orthodontics, member of orthodontic research center, school of dentistry, shiraz university of medical sciences, shiraz, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی شیراز (Shiraz university of medical sciences)

m عشاق | m oshagh
dept. of orthodontics, member of orthodontic research center, school of dentistry, shiraz university of medical sciences, shiraz, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی شیراز (Shiraz university of medical sciences)

a خزاعی | a khozaei
orthodontist, dept. of orthodontics, international branch, school of dentistry, shiraz university of medical sciences, shiraz, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی شیراز (Shiraz university of medical sciences)

نشانی اینترنتی http://dentjods.sums.ac.ir/index.php/JDSUMS/article/view/258
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زبان مقاله منتشر شده en
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نوع مقاله منتشر شده Original Article
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