Key of “Common Construction” (6 slides)
A design improvement, around 1770, led to the key of “Common Construction.”
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Single Shaft Bend Key IllustrationModifying the key shaft, with a single bend, reduced excessive torque from the shaft through the tooth being extracted, thereby diminishing harm to proximal tooth, gum and bone. These keys were considered English in origin but generally referred to as Clef de Garengeot.
Courtesy of Martino Publishing, Eastford, CT — Colyer, 2006
Clef de GarengeotThis Clef de Garengeot (A147.161) has an ebony handle and a single shaft bend near the bolster and...
University of the Pacific Permanent Collection, Donor: Maurice J. Owens, DDS
Knurled ScrewThis Clef de Garengeot (A147.161) has an ebony handle and a single shaft bend near the bolster and a metal screw holding the claw in place.
Screwdriver in HandleA screwdriver for changing the claw size is found inside the two-part handle, similar to those keys dating circa 1796-1824.
Crescent-Shaped Claw TipThe claw edge forms a single scooped crescent and...
Improved ClawThe claw edge forms a single scooped crescent and its inner surface is hollowed and serrated to better accommodate and grasp the tooth root, a design improvement appearing circa 1800.