Before we heat treat the Nitinol root canal files, we need to put it in an ultrasonic cleaning machine to clean its surface, and then put it in a vacuum furnace for heat treatment. The specific steps are as follows:
1. Cleaning: First, we add an appropriate amount of acetone to the ultrasonic cleaning machine, and then put the root canal file in to clean the surface to remove oil and contamination.
2. Put it into the furnace: We install the quartz clock in the vacuum furnace and prepare to start it. At this time, the vacuum furnace is under negative pressure. First break the vacuum, open the furnace door, put the root canal file into the furnace, put the heat shield in, and then close the furnace body. Then, we set up the process, save the recipe, close the exhaust valve, and slowly open the damper valve. Finally, we start the mechanical pump and wait for the mechanical pump to pre-evacuate the vacuum in the furnace to within 20 Pa. We start the molecular pump and let the Nitinol root canal file sinter in vacuum for about 2 hours.
3. Out of the furnace: After the process is cooled down, close the baffle valve. After the molecular pump has completely stopped, turn off the heating switch, turn off the molecular pump, turn off the mechanical pump, open the exhaust valve, and finally open the furnace door.
4. Test: We take out a root canal file that is treated with vacuum furnace heat, make a pre-bend to it, and then put it in warm water to quickly restore the original shape. Due to dental treatment, it is not easy to puncture.
Nitinol root canal files that have undergone vacuum heat treatment are superior to root canal files that have not been heat treated, both in terms of surface and performance.
