Abstract
A computer simulation model was used to investigate the relations between the blade opening of shape memory alloy implants (SMI) and factors involved in the heat and temperature of physiological saline solution used for irrigation. The conclusions were as follows
1. Irrigation with physiological saline solution at a temperature of 44℃,1℃ higher than the austenite transformation finishing (Af) temperature, for twice the thermal time constant resulted in the blade opening of SMI.
2. Since the temperature within the slot of the jaw bone decreases drastically after the termination of irrigation, it is important not to discontinue irrigation until completion.
3. During irrigation, factors that lower the temperature of the irrigation solution and the tissue in the slot of the jaw bone should be eliminated.
4. The jaw-slot temperature and the thermal time constant vary depending on the clinical situation of the individual patient. Therefore, it is most important to confirm whether or not the jaw-slot temperature of the nonirrigated side has reached the Af temperature.
The clinical operative procedure that is currently used was found to be optimally suited for the blade opening of SMI in terms of a short time, reliability, and lack of heat-induced injury to the surrounding tissue.
