Johnson-Promident University High Speed Handpieces
2017-2-1 · • Air turns a turbine located in the head (front) of the handpiece. • The turbine consists of two miniature bearings, an impeller, and a spindle/chuck assemblythat holds the bur. • Air is introduced into the handpiece via the chair unit foot pedal, goes through the airline attached to the back end of the handpiece, up through the handpiece
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