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The Gates-Bonwill and Howland-Perry crowns.


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Credit: The Gates-Bonwill and Howland-Perry crowns. Credit: Wellcome Collection. Attribution 4.0 International (CC BY 4.0)

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Fig. 7. The Gates-Bonwill crown, patented in 1875. The crown was made of porcelain, and was secured by a metal dowel which was threaded and screwed into the crown, and anchored with amalgam. Fig. 8. The Howland-Perry crown, where the dowel was confined to the body of the porcelain. Page 5, 'Principles and practice of crowning teeth : a practical, systematic and modern treatise upon the requirements and technique of artificial crown work, including some incidental reference to bridgework' byHart John Goslee, 1903.


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