Extractor crown and bridges in the dentures (Machine-translation by Google Translate, not legally binding)

摘要

APPARATUS EXTRACTOR OF CROWNS AND BRIDGES IN THE DENTURES, characterized by being constituted by a cylindrical piece or central shank in which they are inserted: a lower washer to avoid the detachment of the pieces and to retain them united in the same; then a cylinder bored internally to give rise to the penetration of the rod, and which externally has the shape of several cone trunks joined by their upper and lower base respectively; which is followed by a spiral spring and finally by a lower threaded semi-sphere that serves as the cover of the assembly. (Machine-translation by Google Translate, not legally binding)