US515400A

US515400A - Artificial tooth

Info

Publication number: US515400A
Authority: US
Publication date: 1894-02-27
Anticipated expiration: 1911-02-27

Description

HARDY B. HARRELL, OF GAINESVILLE, TEXAS.

ARTIFICIAL TOOTH.

SPECIFICATION forming part of Letters Patent No. 515,400, dated February 27, 1894.

Application iiled December 29, 1892. Serial No. 456,664. (No model.)

To a/ZZ whom, it may con/@erm Be it known that' I, HARDY B. HARRELL, a citizen of theUnited States, residing at Gainesville, in the county of Cooke and State of Texas, have invented certain new and useful Improvements in Artificial Teeth; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters of reference marked thereon.

The present invention has relation to the manufacture of artificial teeth, and the object thereof is to improve the construction of the crown of the tooth whereby it can be attached to the gold cap that has been made to fit the end of the root that is to be crowned, the manner of attaching being materially facilitated and rendered much easier than heretofore. The above objects I attain by the construction substantially as shown in the drawings and hereinafter described and claimed.

Figure l of the drawings represents a perspective view on an enlarged scale of an artificial tooth embodying my invention; Fig. 2 a vertical section thereof.

In the accompanying drawings A represents an artificial tooth of which a is the crown, said tooth being of the usual material from which artificial teeth are made.

In the manufacture ofthe tooth, a platinum band B is embedded in the material from which the tooth is to be made and baked with it, the band being exposed at the back of the tooth as shown at b and also the edge thereof, makes the soldering easy and attaches the crown and cap firmly together. It should be understood that the end of the root of the natural tooth is prepared and fitted with a metal cap or ferrule, and the bottom of the crown is ground to it on the end of the metal cap, the crown being then placed in position and secured to the cap by some adhesive wax. The cap is now removed with the crown in position and afterward invested in some investment material and then soldered together. After the crown and cap are firmly connected together by soldering, as hereinbefore described, the crown and cap are then set on the root by cutting a hole in the top of cap into the concave space in the bottom of the crown. A post is tted and cemented into the nerve canal in the root with the end protruding, at the same time the cap is filled with cement and forced over the root. The post and cement pass into and fill the space c in the bottom of the crown and any surplus of cement passes out through the hole d in back of crown. The platinum band on the crown renders the same valuable for attaching bridges and is especially suitable for bicuspids and molars, possessing all the advantages and having a much better appearance than the gold crowns. The opening in the crown for the escape of any surplus cement may be dispensed with, as the band is the especial feature of the invention, and I therefore reserve the right to make any changes or modifications in the details of construction as would come within ordinary mechanical skill, and this without departing from the principle of-my invention.

Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

An artificial tooth-crown having a platinum or other metal band embedded therein, said band being exposed at the back of the crown and covered at the front thereof, substantially as and for the purpose set forth.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

HARDY B, IIARRELL.

Vitnesses:

M. W. STAMFORTH, JOHN C. KING.