Final answer:
The low speed handpiece uses a lentulo spiral to place sealer and cements into the canals during RCT.
Step-by-step explanation:
In root canal treatment (RCT), the low speed handpiece is used with an instrument called a lentulo spiral. The lentulo spiral is a small instrument that resembles a spiral or screw. It is used to place sealer and cements into the canals during the RCT procedure.
The lentulo spiral is attached to the low-speed handpiece and rotates to help distribute the sealer or cement evenly within the root canal system. It is important for the sealer or cement to be properly placed to ensure a successful RCT.