2005 Volume 46 Issue 7 Pages 1551-1554
In order to evaluate the clinical performance of the Co–Ni–Cr–Mo alloy wire in orthodontic application, bending properties of Co–Ni–Cr–Mo alloy wire was investigated in comparison with the conventional stainless steel wire and Co–Cr alloy wire. Three-point bending test was carried out for the wires with varied drawing rate up to 3.0 mm in deflection and then unloaded with 0.2 mm/s of loading/unloading speed. Bending yield load of the Co–Ni–Cr–Mo alloy wire increased and the residual deflection decreased with increasing wiredrawing rate. The best processing condition was decided as the wiredrawing rate of 78% with the age-hardening treatment. The bending elastic modulus of the Co–Ni–Cr–Mo alloy wire was higher than those of stainless steel wire and Co–Cr alloy wire. The bending strength of the Co–Ni–Cr–Mo alloy wire was lower than that of stainless steel wire and was comparable to that of Co–Cr alloy wire.
