4Quintao C C, Cal--Neto J P, Menezes L M, et al. Force-deflection properties of initial orthodontic archwires [J]. World J Orthod, 2009, 10 (1): 29-32.
5Pandis N, Polychronopoulou A, Eliades T, et al. Alleviation of mandibular anterior crowding with copper-nickel--titanium vs nickel-titanium wires : a double-blind randomized control trial[J ]. Am J Orthod Dentocial orthop, 2009, 136 (2) : 152-157.
6Zinelis S, Eliades T, Pandis N, et al. Why do nickel-titanium archwires fracture intraorally? Fractographic analysis and failure mechanism of in vivo fractured wires[J]. Am J Orthod DentoJacial Orthop, 2007, 132 (1): 84-89.
