Mechanical Properties Of Orthodontic Wires In The Second-order Bends－the 2-dimensional Plane Study

Practically speaking,,the orthodontic process is usually divided into two stages--biomechanics phase and biologic phase. Tooth movement is caused by the force, which is transmitted to the periodontal tissue through the related tooth; then a series of changes and adaptive rebuilding take place in the periodontal tissue and tooth movement follows consequently. The study of orthodontic biomechanics is necessary when we are to refine the appliance design, exert the orthodontic force rationally and control the tooth movement precisely.The objective of this study is to investigate the mechanical properties of orthodontic wires in the Second--order bends in 2-dimensional plane. Several NiTi round wires and stainless steel round wires with various cross-sectional dimension were selected, and loading-unloading experiments were carried out in the micro-orthodontic archwire testing apparatus with a 0.022×0.028 inch...