Combined aging effects of strain and thermocycling on unload deflection modes of nickel-titanium closed-coil springs. An in-vitro comparative study
| Autor: | Luca Contardo, Francesca Antoniolli, Attilio Castaldo, Giuseppe Perinetti, Gabriele Vidoni |
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| Přispěvatelé: | Vidoni, Gabriele, Perinetti, Giuseppe, Antoniolli, F., Castaldo, Attilio, Contardo, Luca |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Dental Stress Analysis
ORTHODONTIC PROCEDURES Niti coil spring Hot Temperature Materials science aging thermocycling Ni-Ti alloy Orthodontics Orthodontic Appliances Nickel Deflection (engineering) Materials Testing Saliva Titanium Analysis of Variance Universal testing machine coil spring Metallurgy Coil spring Elasticity Sample group Nickel titanium Pseudoelasticity Linear Models Stress Mechanical Dental Alloys |
| Popis: | There are no reports on the aging effects of thermocycling of nickel-titanium (NiTi) based coil springs, and few studies have investigated their superelasticity phases in full. In this study, we compared the mechanical properties of NiTi-based closed-coil springs after the combined aging effects of prolonged strain and thermocycling, as a reflection of the clinical situation.Ninety NiTi-based closed-coil springs were used, 30 each of the following types: (1) Nitinol (3M Unitek, Monrovia, Calif), (2) Ni-Ti (Ormco, Glendora, Calif), and (3) RMO (Rocky Mountain Orthodontics, Denver, Colo); all had similar dimensions (length, 12 mm). In each sample group, 2 equal subgroups of 15 coil springs were extended by either 50% (to 18 mm) or 150% (to 30 mm), immersed in artificial saliva, and kept at 37°C for 45 days. All springs underwent sessions of 1000 thermocycles (1 minute long) from 5°C to 55°C on days 22 and 45. Unload deflection curves from both the 50% and 150% extensions (according to their strain subgroups) were recorded by using a universal testing machine before the strain (baseline) and at both 22 and 45 days, immediately after thermocycling.At baseline, the loads exerted by the NiTi-based coil springs varied from 99.8 to 245.1 gf for the RMO (50% strain) and Ni-Ti (150% strain) groups. Statistically significant, although small, differences were seen at each time point in both the 50% and 150% strain subgroups; generally, the highest and lowest values were recorded in the Ni-Ti and Nitinol groups (all, P0.001). Only the Nitinol coil-spring group showed an acceptable superelasticity phase. The strain and thermocycling did not dramatically change the deactivation forces of any coil springs.NiTi-based closed-coil springs might not have a superelasticity phase, and prolonged strain and thermocycling do not produce clinically relevant alterations in their deactivation forces. |
| Databáze: | OpenAIRE |
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