US1082058A - Process for casting artificial teeth. - Google Patents

Description

H. A. WIENAND.

PROCESS FOR UA$TING ARTIFICIAL TEETH.

APPLICATION FILED AUG. 21, 1912.

1,082,058. Patented Dec. 23, 1913.

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Specification of tenderness.

Patented neeeaieis.

This invention relates to an improved.

process for casting artificial teeth, which are usually made of porcelain or some similar substance, which is pressed in the plastic state into metal molds or dies. The method hitherto employed has usually been to make a sand or :plaster mold of the pattern which has usually been a natural or an artificial tooth, and to cast a metal tooth therefrom or to cut out a steel pattern of the tooth. The metal tooth was then im- V tice, I find that good results may be obtained.

.whichnis then coated with a coverm pressed on a plaster block and a female, laster or like pattern was produced ther W cm.

This female pattern was used to cast amet-al mold of brass or the like. When steel patterns were out, the steel has been driven-or late .to"

pressed into openings in a brass form a mold for the artificial teet According to the present inventiomthis process is very much simplified and cheapened by employing electrolytic methods for producin the mold. By this method, I am also ab e to produce a number of sizes of teeth from a single original.

According to this invention, I make 'a metallic duplicate of the original and form a mold therefrom by eleotrodeposition, while I may remove the metallic duplicate from the bath at various periods to obtain larger sizes of such metallic teeth. In pracby employing a composition of lead and zinc forthe metallic du Heats and the metal deposited on this. dup icate by electrolytic means is conveniently nickel.

.In carrying out the invention in practice, the original 1s pressed in a sand or plaster mold and the molten composition of lead and zinc is poured into thls mold. I thus obtain a metallic duplicate of the original. This duplicate is then suspended in an electrolytic bath. After a convenient period, say two hours, I may remove the duplicalxfa o nickel and is consequently larger. his coated duplicate I may press in a sand or like mold to obtain a second metal tooth of larger size than the original. met-a1 duplicate is then returned to the bath The coated and the process of deposition continues.

This process may be arrested at further intervals to obtain "further enlarged metallic copies. The deposition is continued for'several days until a substantial thickness --of nickel has been deposited on the metallic duplicate. Conveniently an 'entire set is treated at one time. The thidkly coated tooth is then removed and placed in a molding box. A suitable metal base is then run into the box and the metal duplicates are-extracted. With the metals mentioned, this extraction is easily effected and there is left behind a clean clear metal mold of nickel with a backing of other" suitable metal or composition as for instance, lead or lead and zinc. The plastic mass of which the articial teeth are formed, is then pressed into the nickel lined cavities of the mold.

The-invention will be more readily understood from the iollowin description given by way of example an with reference "to the accompanying illustrative in which:-

Figure 1, shows the metal duplicate suspended in the electrolytic bath. Fig.2, is a section showing the thickly coated metal teeth placed in the box with the backingin position. .Fig. 3, shows the finished mold.

ig. 4, shows a tooth removed from the bath at an intermediate stage in the coating process.

In carrying the invention into efiect according to one form, a metal zpattern -or duplicate a, is produced from the original. This metal du licate is conveniently made in a mixture of Bead and zinc. The metal duplicate so formed is treated in an electrowhich is placed an annular anode of ni el- 0. Upon the upper edges of the vat are arranged the standards or like su ports (1, adapted to carry a conducting r6 6, from which is suspended by suitable cords a carrier f, serving as a means whereby the metal duplicate is suspended. The nickel anode c, is electrically connected by the wire it, with the positive terminal of t 0 battery or plating dynamo g, the negative terminal being electrlcall connected with the conducting rod e. T e conducting rod 6, is also electrically connected in an suitable manner for example by means 0 the wire In, with the metal duplicate. In use, the current is switched on, whereupon, nickel is electrolytically deposited upon the surfaces of the metal duplicate. After a, convenient period, say two hours, the duplicate, coated with nickel Z, for example" see Fig. 4, may be removed and pressed into sand or other material to produce a mold for obtaining a sec-.

. box up. A suitable metal, alloy or composition is run into the moldin box and serves, on setting, .as a base at. he metal duplicate isthen extracted, leaving behind a clean clear metallic mold having as shown in Fig. 3, a nickel surface and a backing of other suitable metal, alloy or composition, for. example, lead, or lead and zinc. The mold so formed is' then ready to receive the plastic mas; employed for producing the artificial teet It will be understood that the invention is not limited to the particular construction shown in the drawings, neither is it limited to the use of the material specified for producing the metal duplicate, or backing;

While further it must be understood that metals other than nickel may be employed as the material to be deposited in which case of course the anode, and electrolyte of the electrolytic apparatus will be different from those described.

I claim: 1. The method of manufacture of artificial teeth which consists in pressing an original in a mold, producing a metallic duplicate we ves 3. The method of manufacture of artificial,

teeth which consists in forming a metallic duplicate of the original'in a composition of lead and zinc, coating said duplicate electrolytically with nickel, remov ing coated dupli cate from the electrolytic bath, casting a backing on said nickel coating, removing the metallic duplicates and pressin a plastic mass into the cavities left on said removal,

substantially as described.

' 4:. The method of manufacture of artificial teeth which consists in forming a metallic duplicate thereof, coating said duplicate electrolytically, removing said coated duplicate from the electrolyte attvarious stages, forming fresh enlarged metal copies therefrom, replacing said coated duplicate in the electrolyte, removin said metallic duplicate from the electro yte when thickly coated, casting a metal backing thereon, removing the metallic duplicate and pressing a plastic mass into the cavities left on said removal.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

mnmreu AUGUST wunmm. Witnesses:

Cant. Gianni), Juan GRUND.

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