Petra Lie (1848-1907) was a Norwegian dentist.Stenvik, Reidun: Petra Lie i Norsk biografisk leksikon på snl.no. Hentet 10. april 2021 fra https://nbl.snl.no/Petra_Lie She was the first female dentist in Norway.Heier, Johan (1998). Guttehjemmet. Oslo guttehjems sosialfond. s. 8. ISBN 8299470404.
She took her dentist degree in 1872 as the first woman in her country. She had a successful practice in Oslo and was the first Norwegian dentist to use a drilling machine.
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