Pires, B. U.; Souza, R. E. de; Vedovello Filho, M.; Degan, V. V.; Santos, J. C. B. dos; Tubel, C. A. M. Force Degradation of Different Elastomeric Chains and Nickel Titanium Closed Springs. Braz. J. Oral Sci. 2015, 10, 167-170.