USRE1305E - Improvement in the manufacture of artificial teeth - Google Patents

Description

' UNITED STATES PATENT OFFICE.-

SAVMUEL S. WHITE, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN THE MANUFACTURE oFARTll-'lclAL Specification forming pnrt of Letters Patent No. 34,223, dated Januaryl, 1862; Reissue No. l,305, dated I April 2g l To all whom it may concern.;V

Bc it knowll that I, SAMUEUS. WHITE, of

the city of' Philadelphia, in the county ofl Philadelphia and State ofPennsylvania, have invented a new and useful Improvementin Artificial Teeth and I do hereby declare that `tlle following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, formin g part of this specification.

This invention relates to mineral teeth, for what is kllown as vulcanite work. The teeth commonly employed ill such Work are secured ill the vulcanite setting by the aid of pills of platinum, parts 'of which are received ill the teeth and parts inthe vulcanite. These-pins,

which are secured in the teeth in the mann- .and the only means employed to fasten them ill the vulcanite beyond the adhesion of the vulcallife itself has been by the dentist bending them before applying them 'to the setting, alld the consequence has been that the pills have been very liable to tear out of the vulcanite. To obviate this difficulty and supplyA the dentist with teefll which are applicable to l the vulcanitc without any preparation or manipulation of the pins, alld which after vuli canization will beso firlnly embedded and fastened in the vulcanite as not to be liable to disturbance by ordillary wear or by any prob- 1 able accidentyand to this elld illy invention consists in the manufacture of the teeth with pins having heads at their outer ellds.r

To illustrate the invention, Figure 1 is al perspective view of three gum teeth, A A A,

made with platinum pills of the usual construction. Fig. 2 is a similar view of similar teeth made with platinum pills C C` G, having heads d d d at their outer ends according to` my invention. Fig. 3 is aperspective view of one of the vpills before its insertion in the tooth. Fig. 4 is a transverse sectioll of a pin illustrating a modification of the head.

Similar letters of reference indicate corresponding parts where they occur ill the different figures.

In 'the manufacture of' the teeth with pills having heads at their outer ends, the said heads d d may be of circula-r.` form, projecting all around thepins, as shown in Fig. 3 5 but ill soule cases it may be better to make them of the form shown in Fig. --that is to say', that of a circle with a lsegment cut off forming a straight side-tlleobjcct being to avoid the l protrusioll of the head through the outer suri face of the vulcallite setting; and the inner j ends of thc pins which are received within the i teeth may also be iliade with lle-nds, as shown l at e ill Fig. 4, or may be iliade ot'lany other forlll that will enable them to be secured in thc teeth; but with this latter part of the pill i my invention has nothing to do. i To provide for securing the pills ill the teeth, l holes are iliade ill thc molds in which the teeth i are cast for the reception ot' the heads d d d, i such holes lleillgjust large enough at theboti toln or back for the\said heads to fit tightly i within thcnl and llavillg a slight gradual enlargelllellt foward their mouths, to enable the pills to draw out easily frolll them -ill t-lle re lnoval of the teeth from the molds. Before casting the teeth the heads ofthe pins are illi scrted ill the said holes and the holes filled up l `all around the pills with some of the plastic *mineral composition of' which the teethare l cast, after which the casting of' the teeth is l proceeded with ill the usual manner. On the f opening of the mold alld removal of the teeth the composition with which the holes ill the molds were filled up around the pills comes ollt with the pills, and requires to be cut away process. Another way of' securin g the pills is to drill ill the teeth after the first baking or burning, techllically known as biscuiting, holes large enough for the reception of' the heads e c c, and then to pack around the pills within the said holes with sonle of the plastic process, by

Witnesses A. MUs'rIN, Jr., Tiros. H. S'roolt'roN, Jr.

from the teeth and pins before the baking mineral composition alld afterward subject

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