US1643992A - Artificial teeth - Google Patents

Description

E. P. oFF

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- Filed Feb. 1s. 192s ocr. 4,1927. i @1,645,992

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Patented Oct. 4, 1927.

UNITED ,STATES PATENT OFFICE.

EDWARD P. OFF, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOB TO THE DENTISTS i SUPPLY COMPANY, A CGRPORATION OF NIETW'v YORK.

ARTIFICIAL TEETH.

Application led February Heretofore, tooth facings for bridge work have been provided with flat sheet metal anchors baked in the vitrified tooth body'and said anchors have been arranged in pairs and pointed for perforating the backing plate to which they are subsequently soldered. In practice, it has been found that flat sheet` metal `pointed. anchors of this character frequently become crushed when being forced through the backing plate` especially Ywhere it has offered considerable resistance. It has further een necessary to employ two such sheet metal anchors to secure attachment to the backing plate over an area suiicient to insure the necessary stability in the finished bridge work.

The object of my invention is to provide a tooth facing with a stronger sheet metal anchor capable of more positively perforating a substantial backing plate without c ger of being crushed and which, at vthe same time,`will provide attachment over a suffi` ciently extended arca to secure ample strength with the use of a singlepin in the porcelain tooth structure.

My invention comprise, a porcelain tooth facing provided with an anchor bakerl there in, said anchor formed of sheet metal bent or curved upon itself soV as to provide two parts out of alinement and integrally joined at a. sharp angle or on a curve, and shaped to provide a pointed anchor of considerable resist-ance which can be forced through a backing plate with positiveness 'and safety from being crushed, the additional strength being assured by the ybracing effect ofthe angularly disposed side port-ions of the anchor. Q

My invention also comprises details of construct-ion which, together with the above stated improvements, are fully described hereinafter and pointed out in the claims.

. Referring to the dra-Wings: Fig l is a perspective view of a porcelain tooth provided with improved anchor; Fig. 2 is a vertical section of a porcelain facing embodying my improvements iin association with a backing plate; Fig. 3 is a transverse sectional view taken on line 3 8 ofkFig. 2; Fig. t is a plan view of the sheet met-al anchor blank before being bent into the angular form; Fig. 5 is a perspectiveview of the finished anchor before being molded 18, 1926. Serial No. 88,981.

into the tooth structure; and Fig. 6 is a similar perspective view of a modified construction ofthe anchor.

2 is the porcelain facing or tooth body and is shown as provid-ed with theusual fiat back 3. 4The special anchor structure is .shown at i and its form is best shown in Fig. 5. The spec-iai features of myimproved anchor comprise the following: The 1 anchor is stamped, from thin sheet `metal of platinum or suitable alloy which will not melt at the vitrifying temperature of the porcelain of the tooth body, and has the shape substantially. as shown in Fig. 4 in which the upper edges 6, 6, areV inclined toward each other to form the point 7 at or about the middle. The lower or'embedded edge is thickened by being upset, as shown at 8, and whereby the anchor is securely attached to the porcelain tooth, asshown in Figs. 2 and 3. bent upon itself throughits middle and lpointed portion. andthe two side portions 5, 5, thus provided'beingat a V-shaped angle to each other.V When the angular shaped anchor is embedded in the porcelain material, the projecting portions 5, '5, thereof are at an angle to each other. and at their bent portion they provide a strong angular pointed end 7, said end projecting to a greater 'distance from the back 3 of the facing thanthe remaining side portions 5,

r5. The strength of this "V-,shaped anchor insures the point 7 thereofbeing capableof perforating a relatively thick backing plate without crushing, as shown in Figs. 2 and 3. Furthermore, the4 angular shape of the anchor kprovides a means of attachment covering a large area and of a shape which prevents any displacement of the toot-h relatively to the backing. Moreover, the angular form of the anchor, where it extends Athrough the plate, provides a groove opening toward the cervical end of the tooth body and insures a stronger union with the plate and bridge (not shown) when soldered in position. A single V-shaped pin embodying my improvements will suffice for attachment to thel backing plate `and bridge.

In place'of the V-shaped anchor being positioned in the facing, as shown in Fig. l, it may be inverted, if so desi-red, or placed in any other position at the back of the The plate so formed is then facing, as preferred, since in any position that it is placed, the rigidity of the point 7 as a perforating instrument is assured.

lWhile I prefer to bend the sheet sharply at its middle, as shown in Fig. 5, it may be more or less curved when being bent, as indicated in Fig. 6. In this case, the metal sheet is bent upon itself whereby the side portions assume a more or less angular relation to each other and the middle portion projects to the greatest extent to constitute a penetrating point.v The side portions 5, 5, Will be united on a curve and the oblique edges G Will also be more or less curved, and Where they join they will provide a relatively pointed part 7a which, While not as sharp as the point- 7 in 5, Will nevertheless provide a penetrating part of great stability.

The anchor may be made of any suitable material capable of withstanding the teinperature required to vitrify the porcelain, and While I have shown the embedded end 8 as thickened by upsetting in the Course of manufacture, whereby it holds iirmly in the porcelain, I do not restrict myself in regard to the particular manner in which the anchor is retained in the porcelain, as any of the methods heretofore employed may be followed. My invention essentially resides in the pointed construction braced by the opposite Walls or side portions converging to constitute the point.

It Will now be apparent that I have devised a novel and useful construction which embodies the features of advantage enumerated as desirable, and While I have. in the present instance shown and described the preferred embodiment tlieieof Which has beenfound in practice to give satisfactory and reliable results, it is to be understood that I do not restrict myself to the details, as the same are susceptible of modification in various particulars Without departing from thespirit or scope of the invention.

Having now described my invention, What I claim and desire to secure by Letters Patent is:`

l. A' facing comprising a porcelain tooth body having at its back an anchor formed of sheet metal bent upon itself and secured in the tooth body so as to project substantially at right angles to the surface at said back thereof said anchor providing a point at its bent portion and having projecting opposite side portions arranged at an angle to each other to form a grooved socket opening to-' Ward the cervical end of the tooth body and having their outer edges inclined toward the point.

2. The invention according to claim 1,.

body provided at its'back With a projecting anchor formed of sheet met-al bent in V -shape and with the groove of the bend opening to- Ward the cervical endof the body and eX- tending therefrom at substantially right angles to its back surface.

Il. The invention according to claim I 3, wherein the gi'ooved projection of the anchor is greatest at its angular bend and which is located most distant from the cervical end of the tooth body to form a more or less pointed portion thereat. s

5. A facing provided at its back With a sheet metal anchor of grooved shape formed of a sheet having its projecting` edges beveled toward each other and said sheet bent upon itself so as to have tivo side portions only and whereby the side( portionsk assume an angular relation to each other with the groove opening in the direction of the length of the facing and the middle portion projecting to the greatest extent to constitute a penetrating point.

6. An anchor for a porcelain tooth formed of a nat piece of metal sheet having its outer edges beveled toward each other and said sheet bent upon itself in grooved form, whereby the side portions assume an angular' relation to each other and the middle portion along the bend projects to the greatest extent to constitute a penetrating point.

7. The invention according to claiiny 6, wherein the sheet is bent Yabruptly into V- shape and the side portions on each side of the angular bend are flat. z

In testimony of Which invention, I hereunto set my hand.

EDWARD i). orr.

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