USRE16876E - poston - Google Patents

Description

Feb. 7, 1928. R 16,876

' L. L. POSTON ARTIFICIAL TOOTH original Filed April 28. 1917 Reissued Feb. 7, 1928.

A, UNITED STATES PATENT OFFICE. I

LEON L. POSTON, or ron'r MYERS, nonma, Assroiron To run commas Damn. mmmc'runnm co., or COLUMBUS, onro, A CORPORATION or 01110.

ARTIFICIAL 'roo'rrr.

original m. 1,338,959, dated may 4, 1920, Serial no. 1 5,135, filed A rn 2a 1917.

relstue filed April 27, 1927. Serial No. 187,085.

M invention relates to improvements in artificial teeth in which a replaceable tooth facing and base is used in connection with a metalbaeking with a biting surface; and the ob acts of my improvement are:

let. 0 provide a suitable backing having a. biting edge or surface adapted to be in serted in the proper bridge work and a porcelain facing having a full base whichcan be I!) removed or slipped off from the backing.

2nd. To provlde such a backing and biting surface that will be strong and to which the facing and base of porcelain can be fitted and attached after the bridge is in place. 3rd. To rovide a porcelain tooth that can be replaced 'upon a bridge without removing the brid e.

4th. 0 provide such an artificial. tooth that the porcelain facing and base can be removed or attached without altering the biting surface.

5th. To provide such a porcelain tooth that the base of orcelain comes in contact with the gum of t e mouth and not the metal and yet ioviding a metal biting edge or incisal sur ace. 6th.- To provide such a surface and backthat the said backing may be constructed separately casting the backing or by runsolder on a thin plate that has been fitted to the entering surfaces without heati the porcelain.

, lustrated in the accompanying drawing, in

' as hi Fi .ure 1 isa erspective view of the porcelain t and base; Fig. 2is a perspective view of t e metal backing; Fig. 3 is a per- 3 active view of the orcelain tooth with t e backing in place; Fig. 4 is a vertical cross section of the porcelain facing; Fig. 5 is a vertical cross section of the backing; Fig. 6 is a side elevation of a finished tooth ofthe bicuspid or molar type.

Similar letters refer to similar parts throughout the several views:

A porcelain tooth d of any proper shape is employed having a full base z. This porcelain tooth d is cutaway by entering surfaces as a, b from a point at a suitable distance above what would be they incisal edge orcutting surface of the tooth and ex tending out to a oint below the finished base to the tooth. nto this porcelain facing I socket a.

attain these objects by the structureiL' contour of the down against it.

ama mhaving the base 2' is a socket c, which socket is made of uniform cross section and is preferably circular though it may take a square or triangular form, depending upon the desired shape of the pin 9 hereafter referred to.

A suitablemetal tooth backing h is employed having outwardly extending surfaces 6 and These surfaces are adapted to fit to the surfaces in the porcelain tooth as a, 5, preferably the surfaces a, 6 form anobtu'se plain angle. When the surfaces on 1 the porcelain tooth form an obtuse entrant plain angle as a and b, a corresponding lainangle is formed on the backing h by t e surfaces 6 and f respectively. At the outermost projection of the surfaces e and f a suitable pin 9 is extended which may be of the same metal as the backing h but which referably maybe cast, Welded or soldered into the backing h and made'of a less expensive or suitable metal. The socket c is so placed with respect to the surfacesa, b or a,- b' as to receive the pin g when the surfacese and [respectively are in contact with the'said surfaces at, b respectively. The pin 9 may be, depending upon the character of 'the socket c, of any suitable cross section but is preferably used in the round form. The pin 9- is adapted to be cemented into the The base a of the porcelain fac I ingd is madefull and of such suitable shape that it maybe ground away and fitted'and may take the form as indicatedat z to fit the The full base 2 of the facing dis extended over the backing It so that the gums: of the.

mouth never come in contact with "the backing it and the facing d is so cut away that the backing h always forms the incisal or biting edge of the tooth.

In the development of h is adapted to be attached and fused or sol-;

dered into bridge workand is so constructed that no portion of it ever comes incontact.

gums of the mouth coming the art of dentistry a backing adapted to be soldered into the bridge in connection with other teeth has with the gums and that it receives the biting .uitc anmcisal or blting-sur ace. By'forma den ojf said suffices-1 find that a porcelain 1 j sutjaces e and f respectively and'the sdcket P h pi eee b s d y P' p y e sfihe e "fthe' at proper distance and cemented securely to rthe backing 11 form ploymw iii-the at htn -engle diheiecrrespondmg sariaces a} and b spectivel celain at we c t 'mev 0 any exthepflrcelain facingd OPEN "a wax backing {formed upon 1 the pol celain facing. d toithashapeof-thedesizedmetal i ewmpet m w t th {in ermeybe. ,aced ez 'wethsn a qdan attached to the *1 Without reinov' ads ed ts jbe efi ed to in suit- I dig: surfaces onthe back ing it use g ilg I k i A .s g isem a having surfaces aand 6 media the the ertificiel tontawith a, full base pro-ifaces outwardtlg adapted to fit ieg the-metal backing from the and kafiiug e metaltineisal a e,

ll; afiijilnd the -pin you h bwkmg ands-the socket, 0 enables the por- V. acedwupeathe backs hee ngk l uc easelwfie the r u e d andemsis qs m suitable metalmay,

r ot-the said recess with an inclined socket exyz i irenjoyed and mplded md a metalof the said facin end 'an-"inc li ned y extending upyveifd y, and foi'wardly able bri ges o1 frames in the inouth, but

projecting surfaces 1n said porcelain facing 55' I extendin fnoxn above the biting edge to a point beovdthebase; asocket' of uniform cross section extending into said facing; a metal'backing having a biting surface; surformed on said backing e inwardly iformed su'rfaccs en said replaceable facing, and a pin extending from neat the outermost qrtion' off said putwardly extending surfaces on said metal hacking and a'da t ed to' enter said socket in said replaceable aci 2. 'An artificial 1035i including a rqfiace- V I I able Porcelain facing, having a full base extending frpm the front to the rear face of" the iacin'g; and. provided with an anglnlar necess having a front wall and a top we extending .upwardl and rcarwardly, said front and top. e s of the recess ringed at an obtuse angle to each otherjand the said facing'being provided at the angle [tending ug'iwardly, and forwardly atjan inclinaticns and ari'angedat an obtuse angle to l to receive the entire strain cf mastication,

saidfl metallic beckig "having an inclined front and top face ati anged at an-obtuse angle to each other Tand'fittmg thewalls of'the' the metallic, backing" at the; angle.

l-l feifmedhyithe eaweed faces thereof J and ar a g ashram obtuse e efld b t the 3ame,'sampin fit'tiiigintheso cket; r; the 90;. 1min; fendpermitting the' saidjfiicin'gtc be iplabiix eairqm idr ni theninjw he i discurbing'fhs bridge"orCotherinountinginj; themetallic backing mayheai'rangeff hat I claim and desire to secure by Letters

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