US2151542A

US2151542A - Pontic tooth

Info

Publication number: US2151542A
Application number: US105680A
Authority: US
Inventors: Winthrop C Whittemore
Original assignee: Dentists Supply Company of New York
Current assignee: Dentists Supply Company of New York
Priority date: 1936-10-15
Filing date: 1936-10-15
Publication date: 1939-03-21
Anticipated expiration: 1956-03-21

Description

W. C. WHITTEMORE March 21, 1939.

. INVENTOR WINTHHDP UWHITTEMDRE Patented Mar. 21, 1939 2,151,542 PONTIC 'roo'rn' Winthrop G. Whittemore, New York, N. Y., as-

signor to The Dentists Supply Company of New York, New York, N. Y., a corporation of New York Application October 15, 1936, Serial No. 105,680

1 Claim.

This invention relates to a pontic tooth, and has particular reference to a pontic tooth incorporating a bulk of porcelain adaptable for root or saddle contact with the tissues, and a lingual 5 incisal area of porcelain.

The primary object of the invention is to provide a pontic tooth having a bulk of porcelain in the ginglvalarea of sufficient size to allow for proper adaptation to the tissues, and having a lingual incisal area of porcelain so shaped as to allow for proper adjustment to antagonizing teeth without weakening the porcelain structure.

Another object of the invention is to provide a pontic having the foregoing features while still providing suillcient area for the frame of the bridge work to which the pontic is attached.

In providing a porcelain tooth having the charaeteristlcs above set forth dimculty arises because of insufficient space for proper shape of the lingual incisal area without sacrificing strength.

According to the invention the porcelain pontic tooth may be of the saddle or root type having a pin ledge area with metal pins extending therefrom and a lingual incisal area of porcelain.

25 This description places the pins which extend out of the pin ledge between two areas of porcelain projecting lingually, which areas-are flat on the surfaces facing the pins, and are known as gingival floor and incisal floor", respectively. The incisal ledge has an arcuate connection with the pin ledge in order to provide strength and prevent breaking of the lingual incisal area.

The drawing illustrates an embodiment of the invention and the views therein are as follows:

Figure 1 is a front elevation of an upper central incisor,

Figure 2 is a vertical sectional view taken on the line 2-2 of Figure 1, and

Figure 3 is a rear elevational view of the tooth is provided with pins II for anchorage to the bridge frame. j

The invention contemplates that the lingu incisal area I! shall be formed to best represent natural tooth construction or anatomy, and in 5 order that perfect articulation may be obtained with the opposing teeth, one of which is shown in dotted lines and characterized i3. t

The pontlc is provided with an incisal floor ll extending lingually, and said floor merges into the pin ledge 9 by an arcuate surface It. This arcuate surface has a radius approximately onehalf the length of the incisal floor to provide sufficient material through the point l8, so that the structure will resist normal forces.

If desired the gingival floor 8 may have an arcuate connection with the pin ledge 9, and this has been indicated by dotted lines at ll. The purpose of providing this last mentioned arcuate surfaceis to assist in the delivery of biscuits 20 from molds during the manufacturing of the porcelain tooth. Both the arcuate surfaces It and I1 assist the dental technician in the preparation of the bridge frame, as will be readily understood by those familiar with the art. With this natural teeth and the contact with opposing teeth so will be porcelain.

Of course, the pontic tooth illustrated and herein described may be modified and changed in various ways without departing from the invention herein set forth and hereafter claimed.

The invention is herebyclaimed as follows:

A porcelain pontic tooth having a mass of material at the gingival end adaptable for root or saddle contact, a pin ledge, a gingival floor extending lingually from said pin ledge, an incisal floor extending lingually, and an arcuate surface extending from said pin ledge to said incisal floor, the radius of said arcuate surface being approximately one-half the length of the incisal floor so as to provide sufficient material between same and the lingual area to permit grinding of the latter to provide proper articulation with antagonizing teeth.

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