US1867300A - Metallic socket and mold for amalgam dies - Google Patents

Description

July 12, 1932. E. E. BAILEY METALLIC SOCKET AND MOLD FOR AMALGAM DIES Filed May 15, 1950 III! h gmmwtoz zfia a Zhz'ley Patented July 12, 1932 UNITED STATES ELPHA n. BAILEY, or DENVER, ooLoaAno METALLIC sooner AND MOLD Eon AMALGAM DIES Application filed May 15,

v This invention relates to improvements in the art of making. and accurately seating amalgam dies in models and relates more particularly to the construction of the socket emwhich, when-completed in the model, will fit the original accurately and which is-particularly valuable in master model and opening the bite cases. I

In inlay and bridge work, it is customary 151 to make amalgam dies of the teeth on which work is to be done and to mount the dies in master models, that in turn are mounted "in articulators andthese dies and models are used in making restorations "which, when completed, will fit the originals accurately providing the dies and models have been carefully made.

The usual method of rocedure is to cut the cavity preparations, after'which a shell-containing an impression compound is inverted over the prepared tooth and after thecompound has set the shell is combined-wlth a ferrule and the two used as a mold for making an amalgam die. After the die has hardened, it is removed and the root portion thereof cut down to a tapered irregular polygon. An impression is now taken of the tooth that is worked on by means of an impression compound and after this is removed the amalgam die is placed into the socket in the impression compound and will fit therein due to the fact that it is the same shape as the tooth from which the impression was taken. Plaster is now used to make a master model and the plaster is poured around the root portion of the die and therefore when the master model is removed the diewill' occupy a posi tion therein that corresponds to the position of the tooth in the mouth. "Tl1B method outlined, although it is quite widely practiced, does not give accurate results and it therefore becomes necessary to do a considerable amount of fitting.

In the employment of my invention, a slightly different method is used and in order 1930. Serial no. 452,625.

to bring out the objects andadvantages of the presentinvention, I will describe the operation as practiced by me. I v c The tooth is first provided with the cavity after which an impression of the cut end of the tooth is taken by means of a shell containing an impression compound. The shell i then combined with my improved socket by means of wax and the two are then embedded in plaster so as to form a mold andthi's is then filled with amalgam. After the amalgamhas set the plaster is broken and the shell and socket removed afterwhich the shell is removed. The amalgam diecan now be removed from the socket if desired.' The sockettapers towards one end and is noncircular and is preferably formed with a cross section that is an irregular polygon so that the die can'be reinserted in one position only. After'fthe' die has been made, heavy foil is swedged overthe cavity and stiffened with low fusing solder, so as to form a temporary The amalgam die is now inserted into the cavity and adjusted to fit the inlay and it will thereforecorrespond exactly to the position of the tooth. With the socket in place on the root portion of the inlay, plaster is poured about the socketin the preparation of the PATENT oFFice-f 1 master mold.- When the master mold is 're- 7 and with more particularity and for this purpose, reference. will now be 'hadto the accompanying'drawing in which: i

Fig. 1 shows aside elevation of a tooth that has beeri'provided with a'cavity preparation;

Fig. 2 fshows the same tooth in the process of having an impression made of'the cavity;

Fig. 3 shows the shell with the impression therein and my improved socket assembly and invested in plaster in position to receive 5 the amalgam and molding the die;

Fig. 4 shows the tooth provided with a temporary inlay and in the process of forming an impression in a piece of impression compound;

1 Fig. 5 shows the amalgam die in position in the impression and tlie root portion seated in the sleeve which is embeddedin a master the cavity has been prepared, a shell 4 ispa-rtly filled with impression compound 5 and inverted overthe tooth. After the compound has set, the shellisv removed and combined with my improved socket 6fby a few drops v of wax and the shell and socket are then inyested-in plaster? The socket and shell are v ;now filled with amalgam and after, the mercury has been squeezed out, the amalgam die 8 is allowed to harden after which-the plaster is broken away and the shell removed. A smalllbojlt 9 is provided which passes through the-socket .and the amalgam die-is formed about this bolt which serves to hold ity in place in thesocket. 7

[A temporary inlay 10 is now formed by swedging heavy foil into the cavity and then stiifening the same with low;fusible solder. After the temporary inlay has been formed, fa piece of-impression compound llis intro 'duced between the teeth and the'j aws clamped thereonso as to form an impression of the tooth. When the compoundhas set, it is removedand the inlaylO remains in'the cavity and forms the bottom thereof. The amalgam'die 8 isnowput into place in the cavity as shown in Fig. 5 and is fitted into the inlay after, which the socket'is invested in a plaster master-model 12. Thehead of the bolt 9 is left exposed and the die can be removed only afterthis bolt has been removed and the bolt can be inserted only'after-the die hasbeen brought back to-the exact positionso that the die willbe accurately seated. For convenience in removing the die from the socket, the latter has been provided with projections 13 that can be engaged by the end of the jaw l tof a pair of pliers-whose, other jaw has its end bent as indicated by 15.

In Fig. 7 the socket 'andv die have been shown separated and the-root portionofthe I 7 claim asnew' is:

die has been designated by reference numeral 16. Particular attention is called to the fact that the socket is tapered and has a noncircularunsymmetrical cross section. It may have the shape of an irregular polygon as shown, or it may have curved sides, but it should not be circular because the dieshould fit ina single rotary positiononly and therefore the cross section should be unsymmetrical. I consider that the shape of the socket is 'of -vi talimportanc ebecause the die must be firmly heldin a singleposition only, and must be readily removable'and' this can be accomplished only bymaking the socket with an unsymmetrical cross section and slightly taperedandl consider that such a socketifor ;the purposespecified as well as a master mold having such a'socket embedded therein constitutes my invention.

Having described my invention what I '1. Ametallic socket for use in molding the root 'end of an amalgam die'to facilitatethe accurate seating of the die in a mastermold, said socket comprising "a tubular tapered #9 metal member whose wall is of substantially the same thickness at all points of unsymmetrical cross section and open at both-ends.

, 2.1 A metallic socket 'for'us'ein moldingthe root end of an amalgamjdie to facilitate the accurate seating of the :die in a master mold, said socketcomprisin'g atubular tapered metal member whose wall isof substantially the-same thickness at all .points whose cross section is an irregular polygon and which-is .open :at both ends;

3. A tapered metallic socket for use-with a 'master'modelof'plasterof Paris and adapted to beiembedded therein, saidsocket having a wall whose thickness is substantially the same; at all points and whose crosssection in a plane substantiallyperpendicular to the longitudinalaxisofithe socket-is a closed fig- .ure of unsymmetricalshape, the smaller end of the socket beingwithin the material ofthe 31 mold and the larger endexposed. I I

4. ,A tapered metallic socketiforuse with a master model of plaster of Paris and adapted to be embedded thereinysaid sockethaving a wall whose thicknessissubstantially the F same at. all points and whose cross section in a plane substantially perpendicular .to the longitudinal {axis ofthe socket is a closed .figure of unsymmetrical shape,- the smaller end of the Socket beingwithin the material of the mold. and the larger end ezqdosed the outer.surface oiithe socket having projections for the; purpose of anchoringit' in thematerial of the model. 1 e

I V Intestimonyiwheredflafiiamy'signature. 5125 IEL HA -E..BAILEY.

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