US1303881A - Artificial tooth - Google Patents

Description

T. F. GLENN.

ARTIFICIAL TOOTH.

APFLICATION FILED NOV. I5. 1916.

1,303,881. Patented May 20, 1919.

3444mm FGienn,

ATENT nine.

THOMAS r. GLENN, or ARDMORE, rnnNsYLvANIm AssIGNon TO THE s. 's'. wHrTi:

DENTAL MANUFACTURING COMPANY,

A CORPORATION OF PENNSYLVANIA.

ARTIFICIAL TOOTH.

Specification of Letters Patent.

Patented Ma 20, 1919.

Application filed November 15, 1916. Serial No. 131,357.

To all whom it may concern:

Be it known that I, THOMAS F. GLENN, a citizen of the United States, and a resident of Ardmore, in the county of Montgomery, State of Pennsylvania, have invented certain new and useful Improvements in Artificial Teeth, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates particularly to that class of artificial teeth that are commonly known as vulcanite teeth, and that are adapted to be mounted on a plate of vulcanite or other suitable material, which may be retained in the mouth of the wearer by suction or adhesion.

The principal objects of my invention are, to provide an artificial tooth which is not only esthetic in appearance, closely simulating natural teeth, but which combines strength and simplicity, with a consequent minimizing of the difficulties attendant upon the manufacture of teeth of similar character.

Other objects of my invention are, to provide an artificial tooth with a retaining abutment forming a pocket, whose characteristic is to readily admit sufficient of the plastic vulcanite as to adequately withstand, when vulcanized, any of the strains incident to the normal use of natural teeth, without the necessity of the skilful packing usually re quired in mounting teeth of this class.

Specifically stated, the form of my invention as hereinafter described comprises an artificial tooth having a recess in its lingual face extending toward the incisal end of the tooth, and forming a transverse undercut rertaining abutment or shoulder connecting the lateral walls of said recess, which are not undercut and which therefore provide webs which afford maximum strength.

My invention also includes all of the various novel features of construction and arrangement as hereinafter more definitely specified.

In the accompanying drawings, Figure 1 is a rear elevational view of a tooth conveniently embodying my invention; Fig. 2 is a central vertical longitudinal sectional view of said tooth, taken on the line 2-2 in Fig. 1; and Fig. 3 is a transverse sectional view of the tooth shown in Figs. 1 and 2, taken on the line 33 in Fig. 2.

In said figures, the tooth body 1, whose lingual Wall comprises the ridge-lap 2,.shut 3 and bite 4, 'is provided with the recess 5, the labial wall 6 of which preferably slopes labially toward the incisive edge 7 of said tooth, but may be parallel with the shut 3, or otherwise disposed if desired.

Within the recess 5 the tooth may be preferably provided with a pin or projection 9 extending from its labial wall 6 and serving to prevent the longitudinal displacement of the tooth with respect to its mounting.

Said pin or projection 9 is disposed in spaced relation to the lateral walls 10 and 11 and the incisive wall 12, the former of which are preferably disposed substantially parallel with the axis of said pin or projection 9, while the wall 12, latterly referred to, is undercut and labially extends toward the incisive end of the tooth to form the transverse pocket 13, which provides the retain ing shoulder 15 in opposition to the natural strains incident to the act of mastication.

It will be observed that a tooth constructed in accordance with my invention, wherein the lateral walls, not being undercut, not only afford substantial strengthening webs 16 and 17 at the respectively opposite sides of the tooth body, and at the region where it is most likely to fracture, but it affords the greatest possible opening into the recess for the convenient packing of the rubber, which is highly essential, especially so in extremely narrow teeth, wherein the transverse space is necessarily limited.

It may be here noted that a tooth constructed in accordance with. my invention may be readily packed with the rubber for vulcanization, by tamping said rubber in but one direction, that is, toward the incisive end of the tooth, for as the lateral walls are not undercut, it is unnecessary to tamp the rubber toward the sides of the tooth. Thus it will be seen that the packing of said tooth arrangement as herein set forth, as it is obvious that various modifications may be made therein Without departing from the essential features of my invention as defined by the appended claim.

Having thus described my invention, I claim: I

A tooth having in its lingual face, a recess Whose lateral Walls are disposed substantially normal to said lingual face, and Whose 10 incisively disposed Wall is undercut to form a transversely directed pocket.

In Witness whereof, I-have hereunto set my hand this 14th day of November, A. D.,

THOMAS F. GLENN.

Witness WILLIAM J. RUSSELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0.

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