USRE1904E - John a - Google Patents

Description

- Beit known that I, JOHN A.

UNITED STATES ...PATENT OFFICE.

JOHN A. GUMMINGS, OF BOSTON, MASS., ASSIGNOR, BY MESNE ASSIGN;

MENTS,v TOTHE DENTAL VULGANITE COMPANY, OF SAME PLAGE:

IMPROVEMENT IN ARTIFICIAL GUMS AND PALATES.

Specification iiorining part of Letters Patent No. 43,209, dated June 7, 1864; Reissue No. 1,904, dated January 10, 1865; Reissue No. 1,904, dated March 21, 1865.

To all whom it may concern 4 CUMMrNGs, of Boston, inthe county of Suffolk and State of Massachusetts, have Yinvented certain Vnew and useful Improvements in Plates for Artificial Teeth; and I do hereby declare that the followingdescription, taken in connection with the accompanying plate of drawings, hereinafter referred to, forms a full and exactspeci- .iication of the same, wherein I have set forth A.the nature and principles of my said improvements, by which my invention may be distingnished from all others of a simxlarclass, to-

gether with such parts as I claim and desire to have secured to lne by Letters Patent.

The method hitherto practiced of attaching vartificial teeth to a metallic plate fitting to the'roof of the mouth is attended with many objections 'and inconveniences, as the plate, hardand nnyield'ing, naturally hurts the mouth, and in some degree impedes mastica vtion'and perfect articulation, while the expense ofv the metal employed prevents many from availing themselves of' the advantage of artiiici'al teeth.

My present invention consists in forming the plate to which the teeth or teeth and gums are attached of hard rubber or vulcanite, so called-an elastic material possessing and retaining in use sulicient rigidity for the purpose ofmastication, and at the same time being pliable enough to yield a little to the motions of the mouth. I

My manner of making and using said hardrubber platesis as follows: A wax or plaster impression ot' that part ot the mouth which the plate is to tit is rsttaken, and from that impression a 4plaster cast is made which will exactly resemble that partfof the mouth fromwhieh the first impression was taken.- A plate of'wax ofthe general form of theintended rubber l[date is their made m this plaster cast, and around the front of this Wax plate a vertical ridge of Wax is iix'ed about in the position which the teeth are to occupy, in the same manner as is generally practiced in the construction of gold plates for artificial teeth. A plaster mold is then made from this Wax plate, fitting it both ofithe upper and under side, which plaster mold is' known generally as the articulator, and is constructed so as to hold the wax plate securely and conveniently for manipula-tion, leaving the front edge, where the teeth are to be applied, exposedand accessible.

The figures of the accompanying plate of drawings represent my improvement-s.

Figure 1 is a front elevation ot' a set ot' artificial teeth and plate formed by my improved method. the plate and teeth. Fig. 3 is a central vertical section of the same. The teeth shown in the drawings are glimteeth, so called-that is, having porcelain gums formed in one piece with the teeth and properly colored-and they are shown each one separate; but they may be without porcelain gums, in which case the palate and gums will be formed in one piece of hard rubber, and if gum-teeth, they may be formed in groups ot 'two or more, as desired.

My' mode of operation is the same whether gum-teeth or teeth alone are used, or separate or in groups. The teeth are set in place in the wax plate and adjusted to the proper distance and fullness in same manner as is generally practiced in setting teeth in gold plates.

Inl thedrawings the gum-teeth are made separate and marked ay a. The wax. plate and gums, with the teeth adhering thereto, are now set upon the original plaster cast of the corresponding part of the mouth, and plaster is poured all around up to about the lower edge (as it lies) of the wax plate. The margin or outlying surface 'of plaster is oiled or varnished, and plaster poured over the Whole,

forming a' complete mold of ltheplate and' them hold or secure the teeth permanent-l y in.

position. The plaster mold, with the teeth adhering therein, as just described, is now filled with soft rubber, a little at a time, pressed in with the finger, or in other convenient way, and care is to be taken that the rubber ismade to completely lit` into the cavitiesiand anpund.

Fig. 2 is a view of the lower side of the prouberances, (iucludugthe pins) and is iilled in to the hiekuess or depth desired to .form the plate. I then lock the rubber plate .in position by shutting the other half of the plaster mold over it to insure' its retaining its exact form while Warming, and then heat or hehe it in "an oven7 or in any other suitable Way. f

,lhe soi't'rubber or gum so inserted in the mold is to beeom'pounded with sulphur, rubber, &e. iu the manner prescribed in the patcut ofv Nelson Goodyear,dategl May `6, A. D.

185i, for making" hard rubber, udiis to beV IV- subieeted io .sueieut heat to vulcauize-or harden it, substantially as vdirected in that patent. ib is also to be colored in imita-tion of i 'the mlural gums by mixing it With Vermilion,

or other suitable coloriugr-matter, while in the soft state. `After the plete has beeuh'eated sueiently to harden it or convertit into hard iuiber or vulcauite/fA so called, the mold is removed and thepla'teris polished ready for use. i v

Having thus described the method I have used for making and using said hard-rublwr or vulcanite plates, what I claim herein, and

desire to secure byLetters Patent, is`-'l The plate of hard rubber or vuloanite or its equivalent, for hold-ing articial teeth or teer h Y JOHN 'A'. CUMMING Sr Witnesses: 4

JOSEPH GAVETT, SAML. M: BARTON.

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