US1031332A - Artificial tooth. - Google Patents

Description

L. E. EVSLIN. ARTIFICIAL TOOTH. nrmpumu rmm oomn mo.

, 1,031 Patented July'2, 1912.

- by soldering.

inner side of the backing and to the UNITED sTATEs Paras l OFFlCE.

LEO n. EVSLIN, 01? NEW YORK, N. Y.

ARTIFICIAL TOOTH.

- Specification of Letters Patent.

a I Patented July 2, 1912.

Application filed October 17, 1910. Serial No. 587,458.

To allavhom 'itmay concern:

Belt known that I, LEO E. EVSLIN, residing at New York, in the county and State of New York, have invented certain new and useful Improvements in Artificial Teeth, of which the following is a specification. p

This invention relates to artificial teeth, particularly of the sort known as interchangeable or replaceable teeth. I have heretoforedevised and patented certain improvements in this class'of artificial teeth, characterized by the factthat pins are provided, which are adapted to be firmly engagedjwithartificial teeth which are provided with cavities correspondingly shaped ing thereinwhich is adapted to be engaged over the projecting end of the pin, so that when the proper relation of the backing to the tooth has been determined, the backing may be permanently Secured to the pin as Much diflicult has been experienced with teeth of the kin described, in the firstplace because the fixing of the relation between pin and tooth was not positively and easily accomplished, and the attachment between pin and tooth not so strong as desirable; and in the second place because in soldering the backing to the end of the pin projecting through it, it' frequently happened that particles of solder found their way to the shank so that when the latter was subinto the cavity of the likelihood of splitting of the pin, sequently introduced tooth, there would be the porcelain.

I provide an artificial tooth and appur: tenant devices whose practical'use is free from the objections above noted, and which attaindesirable results other than those above noted as the aim of my present invention. I

The invention accordingly consists in the features of construction, combinations of elements and arrangements of parts, which are exemplified in.the construction hereinafter described, and the scope of'the application of which will beaindicated in the following claim.

- Figure 1 IS a rear. elevation of a tooth,

showing the opening of the pin cavity. and

the counter-sunkseatsurrounding the same and indicating indotted lines that part of the cavity which extends within the depth pids of the tooth; Fig 2 is a central vertical section taken at right'angles to the view shown in Fig. 1 and with the pin and backing-inf place; Fig. 3 is a rear elevation of Fig. 2;; Fig. 4 is a perspective of one of the at};

taching pins, shown also in Fig. 2; Fig. 5 1s a collective view'm perspective of several different forms of boxings which are-adapt-f ed to be inserted in, and which give shape to tooth cavities; Fig. 6 is an' elevation of a backing such as Imay apply; Fig. 7 is a view similar to Fig. 1, but showing a'tooth provided with a differently disposed scat; Fig. 8 is *a viewsimilar to Fig. 2, ofthe subject-matter of F ig. 7 Fig. 9 is a view' similar to Fig. 3', of a tooth like t-hat shown in Fig. 7, to which has been attached a pin like that shown in Fig. 1.0, with which no;

operates a backing' such as shown in Fig. 5

12; Fig. 10 is a perspective of a'form of pin adapted to be used in connection with the tooth shown in Fig- 7.. Fig. 11 is a perspective of another formof pin adapted for use in connection with the tooth shown in of backing which is adapted for use with the pin shown in Fig. 10. v i

ings, 1 indicates an artificial tooth of pol: celain, or the like, which is provided with a; cavity 2, running in the case of bicuspids and molars toward the'bu'ccal cusp, the case of the six anterior teeth running toward the cuttin edge of the tooth. This cavity is prefera ly somewhatconstricted toward its inner end, in the case of bicusand molars toward the'lingual surface or cus 7, and in the'case of anterior teeth to ward the labial surface. The shape of the cavityis defined by a boxing 3,- which may be of platinum, that is baked in the tooth at the time of manufacture. Aside frjom the fact that I prefer to have the hoxin tap'ered at one end, as shown in Fig. 5, t ecr'osjs section thereof may b Ivaried at will, ex-; cept that for obvious {reasons I prefer that its cross-section shall hfother than circular, for instance, rectangi arpsqua're, elliptical, (-ruciform,"etc. The oxing 3 does not ex tend flush with the outer surface of the tooth surroumliug the cavity which it defines, but

there-is provided a counter-sunk seat 4, surrounding the opening of the cavity. This: seat may extend'on all sides of the cavity opening. or on two opposite sides thereof, or otherwise. pin 5 is provided having j Fig. 7; and Fig. 12 1s an elevationof a form shankshapedfappropriately to the cavity in the tooth,fand adatpted to be inserted thereshould. also into. That is to say, the shank may be of any desired cross-section, to'correspond with various cavities already referred to, and,

preferably have a tapered end 6-, corresponding with thef tapered portion of the cavity.- "At the other end of the shank provided an" integral lateral projection 7, Q

a thickness so that when the pin isp0 sitloned'asshown'in Figs. -2 and 8, said lateral projection will-fit snugly within its. cor;

respondingly shaped counter-sunk seat 4 in? the tooth, and the outer surface of the lateral projection will be flush with the rear 10 and 11 it takes the form of the horizontal bar-in a T. These are merely illustrations,

. and the only requisite is that the lateral projection must correspond, with the countersunk seat in' the tooth surface. Obviously,

;if-'the seat; and the projectionare other than circular, there can be-no relativelateral movement..." I prefer also that the projeclike" that shown in Fig- '4' has been intro-.

'tion ,shall reasons which will .30. I

the pin,

be in the nature ofa collar, for

presently appear.

. Extending beyond the lateral projection 7 is an attaching portion 8, whose cross-section' is immaterial. In Fig. 4:. I

show the attaching portion 8 alined with the shank of the pin, also in Fig. 11; and in Fig. 10 there are two members 8, one at each end of the'lateral projection 7. "When a pin duced into a correspondingly shaped cavity of a tooth, as in Fig. 2, and the member 7 seated upon the seat 4, the attaching portion 8 of the pin will project beyond the surface of the tooth. A perforated backing such as shown in Fig, 6 is now placedover'the projecting part 80f the pin, and when the backing has i been permanently secured to the part 8 it becomes a permanent backing to which may be secured in the ordinary way any tooth, which is provided with a cavity that isshaped in correspondence with the inner end of the pin. In soldering the back ing on to the part 8, the collar 7 prevents the passage of solder to the shank, as will be obvious. Where such a pin is used as is shown in Fig. 10, of course, with. a tooth having a correspondingly arranged seat 5, the backing will have to be provided with two perforations, as seen in Fig. 12. this case access of solder to the shank is revented'because the shankis out-of while the provision of noanaaa ment with the attaching portions 8. 'Where a pin 11 used the] danger of entrance of solder to the shank is minimized, although it is not enti1-elyelin1i11ated as in the-case oi among others, andwhich, while easier of practical application, and -resulting in a very strong and durable structure,j-is yet very economical to manufacture, lfor it will be evident that the counter-sunk seat may be provided in the tooth as part of the operation of providing the cavity proper;

on the pin is a very simple matter, and involves but little additional material.

As many changes could .be made in! the. above construction and many apparently widely different embodiments of tion could be made without departingfrom the scope thereof, it. is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative land not in a limiting sense. It is also. to be understood that the language used in the follow ing claim is intended to cover all of the generic and specific features of the invention the lateral projections this invenherein described and all statementsof the scopeof the invention, which as a matter of language, might be sai d to fall therebetween.

Having thus described my invention what lclaim as new and desire to secureby Letters Patentis:..-

In a device of-the kind described, in combination, a tooth having a cavity therein {whose cross-section is nowhere greaterthan at its mouth, there being, a countersunk seat formed in the tooth surface about the cavity bpening, the perimeter of said :seat being other than circular, a pin snugly'fittingm said cavity and having a collar intermediate its ends, said collar exactly fitting said seat and having its outer surface flush with theadjacent surface of the tooth "when in "place upon the seat, and a perforated backihgem. gaged over the outer end of the pin beyond the collar, said backing contacting with the Hush surfaces of the tooth and collar.

In testimony-whereof I havehereun'to arfixed myysignature in the presence of two witnesses. 1

LEO EQEVSLIN. v

' Witnesses

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