M5 Heaters are Thermal Activated NiTi wires that become dead soft when chilled below 20°C. The thermal properties achieve optimum activation as 37°C (body temperature) is approached. This unique characteristic allows for simplified bracket engagement in any malocclusion.
Many orthodontists induce this martensitic phase by chilling the wire below its transition temperature prior to placement. Following engagement, as the thermal wire elevates in temperature within the oral cavity, the transition from martensitic to austenitic phases causes the force level to increase and the shape memory phenomenon to occur.