Final answer:
Handpiece waterlines and air-water syringe waterlines are used to provide water and air during dental procedures, aiding in cooling, irrigation, and moisture control.
Step-by-step explanation:
Handpiece waterlines and air-water syringe waterlines are primarily used for providing water and air for dental procedures.
These are critical components in dental equipment that facilitate a variety of dental processes. The waterlines deliver water to cool the drill during procedures like cavity preparation or to irrigate areas being worked on. The air-water syringe combines both air and water to help in cleaning debris and controlling moisture in the mouth during dental treatments.