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The aim of this study was to evaluate the force degradation and deformation over time of an open-closed and open coil spring. 40 NiTi springs were divided into 2 groups according to the manufacturer (20 specimens per group) Morelli™ (Sorocaba, SP, Brazil) and Orthopli™ (Philadelphia, PA, USA). Then, they were subdivided into 2 groups according to the type of spring (n=1 open spring and open-closed spring. The springs were submitted to the initial compression test in a Universal Test Machine (Instron) in 43.3% of the initial length and a
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