Metal s latent heat of fusion occurs when the metal is changing from a solid to a liquid, far above the range of temperatures in the mouth. Heat is energy that is transferred from one body to another as a result of a difference in temperature. If two bodies at different temperatures are brought together into contact, heat energy flows from the hotter body to the colder body. The effect of the energy transfer is an increase in the temperature of the colder body and a decrease in the temperature of the hotter body. This transfer takes place until the two bodies are equal temperature.
Heat is a form of energy, temperature is a measure of the amount of that energy present in a body.
This cools the wire sufficiently to allow transition to the relaxed martensitic state. The Polar Bear XLT ice instrument acts like a heat sink to the heat energy in the archwire. The Polar Bear XLT ice instrument is designed to keep the heat sink in contact with the thermally-activated wire while it was being tied into the bracket slot for maximum possible wire activation. This results in one of the most the most efficient methods available for fully engaging the larger sized heat-activated archwires. The end that contacts the archwire is designed to be able to fit between anterior teeth.