US1772027A - Porcelain-veneer dental crown - Google Patents

Description

Aug, 5, 1930.

A. B. BAUMGARTEN PORCELAIN VENEER DENTAL CROWN Filed Aug. 2s, 192a m B j fl Patented Aug. 5,1930

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rononL'An vn-nnnn DENTAL cnown Application as. August ea, 122a generally to vemore particularly,

This invention relates neered dental crowns, and

to dental crowns having a-veneer o1 porcelain or similar material. I

veneered gold crowns, as now commonly used, areusually formed by inser ing a veneer in a recess ofthe crown, and oy swedging a rim of gold around the edges or" the veneer; which results in the objectionable display of a rim of metal around the veneer. It is usual, too, to subject the veneered crown to heat for the purpose of securely unit ng the veneer to the gol'dybut, the heating rrequently discolors the veneer and renders the veneered crown unfit for use. p

The object of the present invention is to eliminate the objections just noted. and to form veneered dental crowns in which. the porcelain veneer is locked to the crown without the intervention of heat and with practically all of the objectionable "facial display of gold eliminated.

Other objects of the invention will become apparent as the detailed description proceeds.

In the drawings Figurel is a front elevation of veneered dental crown embodying this invention;

Figure 2 is a vertical section on the line f22 of Figure 1;

Figure 3 is a section similar to that shown in Figure 2, but with the veneer partly re- 7 moved from its supporting crown;

Figure 4; is a horizontal section on the line 4 4 of Figure 2;

Figure '5 isa perspectiveof a crown forming part or" a modified form of the invention;

Figure 6 is an elevation ofa veneer ed. to be usedwith the crown shown in Fig- Figure 7 is a front elevation oi" another modification of the invention;

Figure 8 is a vertical section taken on the.

line 8-.8 of Figure 7;

Figure 9 is aperspective view of the crown shown in Figures 7 and 8,'butwith the veneer removed therefrom; I t

Figure 10 is a central vertical section through a further modified form of the inadapt the tooth to the widest Serial No. 201,602.

vention, showing a veneer partly applied to a crown;

Figure 11 is a central vertical sectionof a the type shown in Figcomplete-d crown of ure 10; and p Figure 12 is a horizontal section 12-l2 of Figure 11.

on the line In the form of he invention shown in Figures 1 to l, the crown '1 of gold, or other suitable material, is shaped to'fit the tooth being crowned. -'lhefront of theto-oth is designed to receive -a,veneer 2 of porcelain or other material adapted to simulate a natural tooth.

In order to receive hold the veneer the loweredge ot the veneered part of the" crown is turned upward to form a'recess 3, and this recess is continued around the'crown to terminate in recessedvertical shoulders 4t and 5 adapted toreceive vertical edges of the veneer-2. 1

The vertical-shoulders 4i and 5 diminish as they approach the top of the'crownjso that the substantially P ordinarily the veneer might be slit longitu- .dinally in said recesseslto position the lower edge 6 thereofin the recess 3. This construction would lock the veneer against downward and lateral movement relative tothe crown, but it would not'prevent the top of the veneerbeing moved out from the-topof the crown. In orzderto lock the veneer securely to the crown against movement in all directions, the upper edge of the veneer is provided with a recess beveled outwardly from the crown. The crown isprovided with a lug 8 at the top edge thereof and adapted to be bent into said recessto lockin'g tongue forsecuring the veneer'to the crown. A Q

t will benoted thatthe lug 8 extends below the top of the veneer and of the crown so that form a dovetail it cannot'h'e bitten clear through and thereby break the locking contact between the crown 1 and the veneer; j I a c As will be clear from nspection of Figure .4, the veneer ez-rtendsaround the front of part ofthe crown. By this construction the veneer will practically contact with the'adjacent tooth and will preventex'posure or" the gold' or other material eXceptatthe-rootof the crown, which 13 a cement in the recesses 1" part that is ordinarily covered by the lips of the person. The slight exposure of gold, or similar material, in the recess 7 has very little effect on the artistic display of the tooth and would ordinarily be taken as a filling of a small cavity in a natural tooth.

' The modification. shown in Figures 5 and 6 is substantially the same as that shown in Figures 1 to 4:, except that the veneer is pro vided at the top edge thereof with outwardly beveled recesses 9 and 10 adapted to receive the lugs 11 and 12, respectively, formed onv the upper ed e of the crown 13,

A further variant of the invention is shown in Figur-s 7, 8 and 9. In this form. the look ing means between the crown and the veneer is placed somewhat centrally of the tooth and not at the upper edge thereof. 7

The crown 14 is prov ded with a veneer r ceiving recess similar to the recesses shown in the other modifications. The veneer itself, however, is provided with a countersunk aperture 15 at any desired position in .the body thereof and away from its edges. The

crown is providedwith a lug 16 pos tioned to correspond with the position of the aperture 15 in the veneer 17 and adapted to be passed through said aperture and be hammered out to fill the countersunk aperture and thereby lock the veneer to the crown.

A further modification of the invention is illustrated inFigures 1O, 11 and 12. In this form, the crown 18 has its lower front edge provided with a recess 19 and is upturned to form a lockng lip 20 adapted to enter a correspondin locking recess 21 in the veneer 22.

The veneer 22 may be secured to the crown 18 by any of the means used to secure the veneer to the crown in the previously described forms of this invention. As shown, the veneer 22 is locked to the crown 18 by means of a lug 23 formed on the top of the crown and adapted to enter and fill a recess 24 formed on the upper edge of the. veneer 22.

In all the forms of the invention disclosed herein, it must be understood that the porcelain or other veneer is secured by a suitable rmed in the crown, n addition to being locked to the crown mecha ically by the dovetailed recess and lug con trnction illustrated and described herein. In all the forms of the invention, it is to be understood, too, that veneer, extends suiiiciently far around the c own as to avoid exposure of any rim around the. crown except at the root thereof. The locking lugs may be arranged in any desired pos ion in order to give them the appearance of very small fillings in a natural tooth.

Vhat I claim is:

1. A veneered dental crown comprising a metallic hollow crown shaped to fit a tooth and having its lower edge upturned to form a recess, a tooth-shaped veneer having its lower edge formed to lit in saidrecess, and

the porcelain, or other 7 means projecting from said crown through said veneer to lock the veneer to the crown.

2. A. veneered dental crown comprising a metallic hollow crown shaped to fit a tooth and having its gingival portion upturned to form a recess, a tooth-shaped veneer having its lower edge-formed to lit said recess and being provided with a countersunk aperture, and a lug extending from said crown and filling said aperture to lock the veneer to the crown.

3. A veneered dental crown comprising a metallic hollow crown shaped to fit a tooth and havin its gingival portion upturned to form a recess, a tooth-shaped veneer having its lower edge formed to fit said recess and being provided with an outwardly beveled notch in the occlusal edge thereof, and a lug extending from said crown and filling said notch to lock the veneer to the crown.

In testimony whereof I afix my signature.

ALBERT BELA BAUMGARTEN.

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