Improvements in artificial tooth crowns / [Lewis Sweetman Seeley].

  • Seeley, Lewis Sweetman.
Date:
1899
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in artificial tooth crowns / [Lewis Sweetman Seeley]. Source: Wellcome Collection.

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    N° 22,221 A.D.1899 Date of Application, 7th Nov,, 1899—Accepted, 9th Dec,, 1899 COMPLETE SPECIFICATION. Improvements in Artificial Tooth Crowns. I, Lewis Sweetman Seeley, Surgeon Dentist, of No. 182 East 82nd Street, Borough of Manhattan, City, County and State of New York, United States of America, do hereby declare the nature of this invention, and in what manner the same is to be performed, to be particularly described and ascertained in 5 and by the following statement: — The invention relates more especially to tooth-crowns which are fitted and attached to a natural root. The objects are so to construct the shank or pin, with which the crown is provided, as to afford a reliable means for securing the crown to the root, the shank also being adaptable to a double rooted tooth 10 as well as to a tooth having only one root. O %J To these ends the invention consists in the construction of a tooth crown having a pin or shank with the capabilities hereinafter more fully described and pointed out or indicated in and by the claim. In the drawings Figure 1 is an enlarged view of a tooth-crown with its lo doubled metal pin or shank: Figure 2 is an enlarged sectional view of the same and of a root to which the shank is secured; Figure 8 is a detached detail of one form of the shank; Figure 4 is a sectional view of a crown and shank, the latter having its extremities formed with a head or turned at an angle within the crown; Figure 5 is an enlarged sectional view of a crown shank 20 and root, the shank being expanded within the cavity of the root, somewhat above the return-bend. In these drawings A represents the crown which may be made of porcelain or plastic material. The upper end a of the shank B is inserted in the material while plastic and baked therein in the usual manner. The shank is made of 25 a strip of metal or wire which is doubled so that the return-bend h forms the end; the metal strips of wire may be round, fiat, or angular, but I prefer the latter, and they are usually of platinum or platino-iridium, though any other suitable metal may be used. The two parts may be brought close to each other at or near the return-bend 3 0 or end h of the shank, thus allowing a taper, and even a point to be made at the extremity which extends deepest into the canal of the root C of the natural tooth. This taper or point may be made either at the time of manufacture or when the crown is being fitted to the root on which it is to be secured. If tlie tooth lias a double root, the return-bend may be cut or filed so as to allow 35 of a separation of the parts of the shank, which, being spread, will form two shanks, one for each root. A space c is left between the two parts after leaving the return-bend, or 40 they may be expanded as at d, Figure 5, so as to fit an enlarged cavity or admit the cement or filling, which will form, as it were, a bridge or solid mass across the canal of the root. This, together with the hold which the cement takes on the walls of the root, will secure the crown more firmly than where dependance is placed entirely upon screw-threads, flanges or other conformations on the exterior of the shank. [Price 8d.]