US1849686A - Artificial tooth and backing therefor - Google Patents

Description

March 15,1932. 5, MYERS 1,849,686

ARTIFICIAL TEETH AND BACKING THEREFOR Filed Oct. 5, 1928 fiweywm": 54mm Warsaw. @W M.

Patented Mar. 15, 1932 PATENT OFFICE SIMON MYERSON, 0F CAMBRIDGE, MASSACHUSETTS ARTIFICIAL TOOTH AND BACKING THEREFOR Application filed October 5,

This invention relates more particularly to an artificial tooth of the pontic type adapted to replace a lost natural tooth, the body of the tooth being provided with a pin or pins projecting from its posterior face adjacent a shoulder overhanging said face and adapted to enter sockets in a metallic backing engaged with a portion of a bridge.

Pontic teeth with projecting pins are in extensive use. Heretofore, however, the relative arrangement of the pins, the backing sockets and the shoulder has been such that the projecting portions of the pins are liable to interfere with the proper occlusion of the opposing teeth and, particularly, in that class of occluison known as short bite. This condition often involves back teeth as well as front, the opposing teeth in this class striking the pins or backing sockets before the teeth are in complete occlusion.

The object of'the invention is to obviate this objection and to further strengthen the tooth by placing the pins in a stronger cross section of the tooth.

These and other objects are obtained by the improved constructions hereinafter described.

Of the accompanying drawings forming a part of this specification- Figure 1 is an inner side view of a tooth body and its pins, constructed in accordance with the invention.

Figure 2 is a section on line 22 of Figure 1.

Figure 3 is an inner side View, showing the body as in Figures 1 and 2, and a backing constructed in accordance with the invention.

Figure 4 is a section on line 41 of Figure 3.

Figure 5 is a view similar to Figure 4;, showing the wing portion of the backing as it appears in the completed tooth.

Figure 6 is a perspective view of the backing to fit the tooth form shown by Figure 1.

Figure 7 is a section on line 77 of Figure 6.

1928. Serial No. 310,562.

Figure 8 is a view similar to Figure 5, showing a different form of the gingival portion of the tooth body, and a portion of a bridge.

Figure 9 is a view similar to Figure 1, showing a modification.

Figure 10 is a lingual perspective view of a backing designed to fit the tooth form shown by Figure 9.

Figure 11 is a labial perspective view of the backing shown by Figure 1.

Figure 12 is a side view of a tooth showing a difierent relative arrangement of the posterior face, the shoulder and its offset portion and the pins.

The same reference characters indicate the same parts in all of the figures.

In the drawings, 12 designates a tooth body having a shoulder 16 overhanging the posterior face 13 of the body. Pins 14 are embedded in the body and project from the posterior face thereof. I have modified the form of the shoulder by offsetting its midlength portion 15 from its end portions 16, to

provide a recess within the shoulder, as shown by Figures 1 and 9.

The projecting portions of the pins 1 1 are preferably in close proximity to the offset portion 15 and the pins are separated from said portion by a narrow space, best shown by Figuresl and 2.

My invention includes an angular metallic backing having a facing portion 17, formed to bear on and be cemented to the posterior face 13 and a wing portion 18, formed to bear on the body shoulder 16.

The backing is provided with sockets 19, arranged to receive pins 14, said sockets being preferably integral with the backing and formed thereon in any suitable manner, so that they have open inner ends and closed outer ends, as best shown by Figure 7. Portions of the socket walls projectfrom the wing portion 18, and are formed to be in terposed between the pins and the ofiset portion 15 of the shoulder.

The oli'set portion of the shoulder may be formed in two parts 15a, as shown by Figure 9.

In practice, a portion of the outer edge of the backing wing 18 is upset, as indicated at 21 (Figures 5 and 8) to close any crevice which may be formed between the ofiset portion 15 of the shoulder and the wing portion 18. This operation may be performed after the parts are assembled. A portion 23 of a bridge is shown by Figure 8.

The tooth body may have the usual root tip 2 k, or saddle tip 25, shown by Figures 8 and 12.

Neither the number of pins nor their shape or exact position in the shoulder depression will affect the principles of this invention. The shoulder 16 may be perpendicular to the posterior face 13, or at any preferred angle. I prefer a slightly obtuse angle of the shoulder to the posterior face with the offset nortion 15 approximately parallel to the long axis of the pins, as shown by Figure 12. It will be seen that portions of the sockets 19 are formed to enter and bear on the wall of the recess 15 or 1560, so that the sockets are interengaged with a recessed shoulder portion of the body to resist pressure tending to displace the body edgewise or toward either the right or the left as viewed in Figure 3.

I claim:

1. An artificial tooth body having a shoulder overhanging its posterior face, and a recess whereby a portion of the shoulder is offset, and pins embedded in the posterior face of the tooth body in line with said recess and projecting from said face into the recessed portion and in close proximity to the offset portion of the shoulder, thereby shortenin g the bite.

2. An artificial tooth body having a shoulder overhanging its posterior face, and a recess whereby a portion of the shoulder is offset, and pins embedded in that portion of the posterior face of the tooth body that is within the said recess and projecting from said face in proximity to the said offset portion of the shoulder.

3. An artificial tooth comprising a body having a shoulder overhanging its posterior face, and a recess in said. shoulder whereby a portion of the shoulder is offset, and pins embedded in the posterior face of the body and projecting from said face in line with said recess and having an annular backing provided with a facing portion formed to bear on said posterior face, and a wing portion formed to bear on said shoulder and said recess, that portion of the wing bearing on said recess having sockets adapted to receive said pins.

4. An angular backing having a facing portion formed to bear on the posterior face of a tooth body, and a wing portion formed to bear on a shoulder overhanging the posterior face, said wing portion having a central thickened portion adapted to engage a recess upon the said overhanging shoulder, and sockets in the thickened central portion of the wing adapted to receive pins projecting rearwardly from said posterior face.

In testimony whereof I have affixed my signature.

SIMON MYERSON.

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