| 摘要 |
<p>An orthodontic teeth alignment correction wire element made of an alloy represented by a chemical formula of TiaNib-cCc, a + b = 100, b = 50-52, c = 0.25-5.0, or an alloy represented by a chemical formula of TiaNib-c-dCcXd, X being at least one selected from V, Cr, Fe, Nb, Ta, W, and Al, a + b = 100, b = 50-52, c = 0.25-5.0, d = 0.25-2.0, and having a pseudoelasticity at the natural human body temperature. The wire has different recovery forces at different sections therealong by heat treating those sections at controlled temperatures of 400-600 <o>C and for controlled time periods of 10-150 minutes and thereafter reheat treating them . An orthodontic coil is made of each of the above-described alloy wires for correction of mismatch of the upper and the lower jaws. <IMAGE></p> |
