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26/01/1875 The first electric dental drill


How the dentist drill works

The inventor was American dentist George Green. For most of the 19th century, dentists had relied on foot pedals to drive their drills. Pedal-driven drills rotated at 15 revolutions per minute. Green created a pneumatic version of a drill run by a pedal-powered bellows. Modern electric drills rotate up to 400,000 rpm.
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