US1120705A - Tooth. - Google Patents

Description

L. E. EVSLIN.

TOOTH.

APPLICATION FILED MAY2.1010.

Patented Dec. 15. 1914.

Witnesses PATENT @FFEQE LEO E. EVSLIN, OF N. v YORK, N. Y., AQSIGI-TQR TO THE UNIVERSAL INTEBCHANGE- ABLE TODTH COMPANY, OF PEOR-IA, ILLINOIS, A CORPORATION OF ILLINOIS.

TOOTH.

Specification of Letters Patent.

Patented Dec. 15, 1914.

Application filed May 2, 1910. Serial No. 553,998.

T all 107mm it may concern Be t known that I, Luo E. Evsnrx, a subject of the Emperor of Russia, residing at New York, in the county of New York and State of New York, have invented certain new and u ful Improvements in Teeth, of which the i'ollov-Jing is a specification.

This invention has reference to artificial teeth, and has for its object to improve the interior construction of the tooth and the tongue and b" king for the same, whereby interchange-a7 y is assured, and also to provid for the grindii'ig or cutting down of long teeth to insure universal application of teeth of the same kind.

A further object of the invention is to improve the anterior est-hetic teeth in a manner which will provide for an all porcelain bite, resembling in appearance the anterior plate teeth used for vulcanite .vork.

In the accompanying drawings, I have illustrated the preferred manner of carrying out my invention. Therein the several views are as follows:

Figure 1 is a perspective view oi a tooth, showing the flared extension oi the tongue protruding from the groove in the posterior face; Fig. 9, is a sectional view of a tooth, ha *ing a tongue within its groove; Fig. 3 is a perspective view of a tongue and its flared extension.

Like numerals of reference denote corresponding parts throughout the figures.

1 denotes the tooth havi' g the labial sur face 2 and the posterior surface The posterior surface 3 at the rubber line is formed with a shoulder or effect -l and from there the posterior surface inclines downwardly and inwardly producing the sloping posterior surface 5, with an offset or shoulder 6, from which point the angle of the posterior surface changes, as at 7, terminating in the cervical border 8.

The tooth is provided with a groove 9, the main portion of which is preferably dovetail in cross-section leading from the posterior surface to the inclined portion 5 thereof, toward the bucal cusp, and said dovetail portion of the groove is lined with a metallic boxing or lining 10. The dovetail portion of the groove communicates with a flared portion or opening 1%, which in width is no wider than the narrowest portion of the dovetail portion and opens out of the posterior surface of the tooth. The under masticating wall 15, which is a continuation of the inner end of the dovetail portion of the groove and the flared portion is of sinuous formation, having the inclined portion 16 and the concave portion 17 uniting in the offset or shoulder 18, said oiiset or shoulder being provided to receive an extension of the tongue and the concave portion receiving the convex edge oi the flared portion of the tongue.

The construction of the under masticating wall of the groove, in manner described, is for the purpose of lodging the extension of the tongue, increase the etl'iciency of the masticatinp' surface of the tooth, which is considerably weakened by the use of a straight under masticating wall, and which also enables me to obtain a broader attachment for the backing, such broader attachment being required to make the tooth of universal application, with teeth of the same kind, which is to say, a long tooth can be ground to any desired shape at the cervical border for its adjustment to the gum or to the crown. The tongue includes the wedge shaped body portion 19 conforming to the dovetail portion of the groove in the tooth and boxing therein and is provided with a flared wing or earlike portion 20 having a rounded or convex edge 21, starting at one end of the wedge portion and extending beyond the same and stopping short of the other end of said we ige portion, as at 22, leaving the extension 523 of the tongue above referred to. The beveled sides of the tongue portion 19 and the side faces of the flared wing or ear-like portion 20 are milled or serrated as at 24, to provide adhering surfaces for the cement, and especially are the flared wing or earlike extension milled or serrated, so that in the preliminary attaching and shaping of the backing to the backing of the tooth, the hard-wax applied to secure the extension to the backing will more readily adhere to the extension and thereby the tongue and backing be more readily removed preparatory to securing the backing to crowns, abutments, etc.

lVhat I claim is:

1. In combination, a tooth having a sloping face between the rubber line shoulder and the shoulder near the cervical border, said tooth having a dovetail groove leading in from said sloping face and connecting with a flared opening, the under masticating Wall partially bordering said groove and flared opening consisting of an inclined portion and a concave portion uniting in an &- set, for the purposes described. 5 2. In combination, a tooth having a sloping face between the rubber line shoulder and the shoulder near the cervical border, said tooth having a dovetail groove leading in from said sloping face and connecting with a flared opening, the under inasticating Wall partially bordering said groove and flared opening consisting of an inclined portion and a concave portion uniting in an off- Copies of this patent may be obtained for five cents each, by addressing the Washington, D. 0.

set, a tongue for the tooth having a Wedge shape portion adapted to fit in the dovetail groove, edgewise from the narrow edge of the Wedge shape portion and adapted to fit in said flared opening and project from Without the posterior surface of the tooth.

In testimony whereof I affix my signature, in presence of two Witnesses.

LEO E. EVSLIN. Witnesses:

GEORGE Orrin, ROBERT PLOWE.

Commissioner of Patents,

and a flared extension projecting

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