Unusual instrument relationship--wrench or turnkey.

S. D. Harn, L. C. Erickson

Research output: Contribution to journalArticle


An unknown instrument donated to the dental museum, and resembling a dental extraction key, was identified by a patent number found on the instrument. The patent was issued to A. G. H. Andree in May 1921. It relates to an adjustable wrench that can be placed over and turn objects of different diameters and can be adjusted to be used on the right or left side. It was compared to the dental extraction turnkey that was used from the early 1700's to the early 1900's. The resemblance between the two instruments is remarkable. They look and function in a similar manner. Did the idea for the wrench come from a dental turnkey?

Original languageEnglish (US)
Pages (from-to)25-27
Number of pages3
JournalJournal of the history of dentistry
Issue number1
Publication statusPublished - Mar 1 1996


ASJC Scopus subject areas

  • Medicine(all)

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