Before revision: The use of initial light wires and the passive placement of subsequent heavier wires made of stainless steel and/or a TMA alloy they claim reduces the pressure exerted on the periodontial ligaments , which with conventional orthodontic mechanics compromises the blood flow there and triggers sometimes nonphysiologic osteoclastic/osteoblastic activity.
After revision: The use of initial light wires and the passive placement of subsequent heavier wires made of stainless steel and/or a TMA alloy they claim reduces the pressure exerted on the periodontial ligaments which may compromise the blood flow there and triggers sometimes nonphysiologic osteoclastic/osteoblastic activity.