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Question
#2148. Maggie
asks:
What did John Greenwood invent in 1790?
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dave_fl
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Dental drill..........George Washington's dentist, John Greenwood (1760-1819), invented the first known 'dental foot engine' in 1790. He adapted his mother's foot-treadle spinning wheel to rotate a drill. Greenwood's dentist son continued to use the drill, but the idea went no further.
Apr 30 00, 5:00 PM
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cartwheel45
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In the year 1790, John Greenwood of USA invented the dental drill. It was very big and heavy and the dentist had to turn a handle [like using a hand drill for drilling holes in wood] to drill out all the bad bits in the tooth. It was a very slow and painful process and people only went to the dentist when they couldn't stand the pain of toothache any longer!
 http://www.cyh.com/HealthTopics/HealthTopicDetails.aspx?p=243&np=292&id=2173
Jan 16 08, 4:13 PM
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