The Wellcome Collection, "200 years of human culture", has very interesting images that are freely available for download for personal, academic teaching or study use, under one of two Creative Commons licences.
Credit: Wellcome Library, London
MANUSCRIPTS: WIHM Western MS 4268
ROSSI Bernardino, a notebook of surgical lectures,
Illustration of dental instruments. Collection: Archives & Manuscripts
Library reference no.: WMS and MS 4268
Copyrighted work available under Creative Commons by-nc 2.0 UK: England & Wales