Rubber Blanks for Dental Plates.
Year: 1894

page_text: Date of Application, 23rd Oct., 1894--Accepted, 24th Nov., 1891
COMPLETE SPECIFICATION.
Rubber Blanks for Dental Plates.
I, JOSEPH SPYER, a citizen of the United States of America, residing at
3 Calle de la Palma, in the City of Mexico, Republic of Mexico, Dentist, do
hereby declare the nature of this invention, and in what manner the same is to be.
performed, to be particularly described and ascertained in and by the following,
statement :-
This invention is a soft rubber blank to be used in the manufacture of dental
plates.
Heretofore in constructing dental plates, the flask was heated to drive all the
wax out. Scrap rubber was then cut up into a number of very fine pieces, and all
these pieces heated to a certain temperature. The rubber, thus heated, was then
packed piece by piece into the heated flask, and then, after the entire flask was
packed, the packed mass vulcanized to make a dental plate.
The objections to this method are that a great deal of time is consumed in.
heating the flask and rubber, and it usually takes from six to eight hours to pack
the flask with the small pieces. Besides this, the operation is accompanied by
considerable dirt, and the operator's hands are unavoidably stained from the
operation. Then, again, it is very difficult to prevent the red or pink and black
rubbers mixing with each other and producing a mottled appearance.
The object of this invention is to avoid all these objections, and this I do by
providing a soft rubber blank, molded by pressure, with or without heat into a
form and size approximate to the bases of the upper and lower dentures, so that
one of my blanks can be placed in a mold and a dental plate produced therefrom
without the time-taking intermediate steps.
My invention consists also of the novelties of construction hereinafter described
and claimed.
In the drawings hereunto annexed-
Figure 1 shows a blank adapted for making an upper plate, Figure 2 one
adapted for forming the lower plate, and Figure 3 is a section on line 3-3 of
Figure 2.
In carrying out my invention I make a soft rubber blank A for the upper or
lower denture, as desired. The blanks are molded by pressure with or without
heat, and in size and shape approximate the bases of the upper and lower dentures;
and they are intended to be sold to dentists, so that when they prepare their plates
this blank is employed, and all the time-taking intermediate steps are dispensed
with, such as the necessity for heating the flasks preparatory to packing, the
cutting of the rubber into minute pieces, and the heating of the rubber to be
employed; and the possibility of the black and red gum used in the plate running
into the pink of the gum, is also avoided. The blanks being also of uniform
thickness the resultant plates will be of uniform thickness, and the labor of polishing
and finishing is avoided.
Although these blanks can be made in either plaster or metal molds, I prefer to
make them in the metal; and I also prefer to use twenty-four (24) parts of sulphur
and twenty-four (24) parts of rubber, and dissolve the same in bi-sulphide of carbon,
together with the necessary coloring matter.
The composition is then run or pressed into the molds, with or without heat,
thereby giving the necessary shape to the blanks. The blank thus comes from
the mold as a soft rubber blank, which is sold to dentists and used by them without

page_text: any further preparation, in the manufacture of dental plates, and the manner of use
is as follows:
After the case has been flasked and the flasks separated and the wax reinoved,
the blank is placed on the model, the flasks closed and placed in boiling water for
several minutes, as is ordinarily done in order to close them. The flasks are then
pressed together, and it is ready for vulcanizing.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is :
A soft rubber blank adapted for use in making artificial dentures, which soft
rubber blank is of the size and shape of the denture and is adapted to be shaped
in any suitable manner and vulcanized, substantially as described.
Dated this 23rd day of October 1894
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.