ABOUT LOW-SPEED HANDPIECES
Low-speed or Slow-speed handpieces are
straight or contra-angle handpieces which are hand-held,air-driven or electric.
They are mostly used in pre-clinical work. They spin the bur or prophy cup or
disc at the rate of 50,000rpm. Used for removal of caries, prophylaxis cases,
refining of a cavity and other endodontic procedures where cutting of the tooth
is not in concern. They are not highly cutting efficient.
Low-speed used for prophylaxis generally
operates at 5,000 rpm and endodontics and other procedures use attachments to
reduce the speed to 1,500rpm or less and generate very high levels of torque for
optimal control.
These low-speed handpieces are designed to
handle much more air pressure than high-speed handpieces and can have a long
life span due to operating speed and design difference.
Speed of the handpieces depends upon the
pressure of the air supply, the configuration of the rotor components and gear
inside the motor and When using these handpieces, there is less need for
cooling the tooth with air and water spray.
They work when the air is introduced into
the handpiece through chair unit foot pedal, the air is forced over the vanes
of the rotor which causes it to spin.after the air moves around the rotor, it
is forced out via the handpiece back end exhaust port.
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