Year: 1888

page_text: I, JOHN ANDREW DALY, residing at No. 906 New York Avenue, in the City of
Washington, District of Columbia, United States of America, Professor of Dental
Surgery, 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 stateinent :-
The invention consists in a gold lining for dental plates having peculiar
characteristics.
Dental plates of vulcanized rubber or celluloid frequently cause an irritation of the
membrane of the mouth, due to chemical action. Plates of pure gold are free from
this objection.
In this invention a rubber or celluloid plate is covered, either wholly or as to its
palatine surface, with a coating of fine gold, as hereinafter described.
I take a smooth plate, which is a non-conductor of electricity, say of glass or
hard rubber, as indicated by, A, in the drawing. To this plate a leaf of burnished
gold, B, such as is commonly used in dentistry, is lightly attached by a weak paste or
mucilage.
The edge of the gold leaf is held firmly down by a frame, C, of non-conducting
material which is held in any usual manner, so as to exclude all moisture from the
surface of the gold leaf next the plate. Of course any other manner of holding the
gold leaf firmly so that no water can get between it and the plate, A, will answer
the same purpose.
Wires, a, b, connected to an electric battery are lightly soldered or otherwise
attached to the gold sheet of leaf, B, and the whole is connected with an electro-plating
apparatus. A deposit of gold, B', will then be made on the surface of the burnished
gold. This gold deposit will be spongy and porous in its character, and will have a
velvety appearance. The electro leposit should be at least, as thick as the burnished
leaf, and may be much thicker.
This sheet of gold, thus prepared, will be removed from the plate, A, and can then
be packed in books for shipment, like other gold leaf. It will have one smooth,
burnished surface, and one porous or coarsely crystallized surface.

page_text: In lining or covering a-dental plate with this prepared gold leaf, the model will
be obtained in usual manner well known in dentistry, and a plaster or other mold
prepared for use in the vulcanizer. This mold will be lined with the sheets of
gold leaf, which can be attached to the mold by a thin varnish or weak cement.
A soft brush may be used in pressing the gold leaf to the mold. The gold leaf can
be cut to nearly fit the mold and any breaks or joints covered by small strips of the
gold leaf.
In every case the burnished surface of the leaf will come next the mold, the porous
surface being toward the part of the mold to be filled by vulcanite.
One or both sections of the mold may be thus lined. That part which corresponds
to the palatine, surface of the mouth will usually be sufficient.
Tho
The mold is then filled with rubber or celluloid vulcanite composition, closed, and
placed in the vulcanizer, where the composition is vulcanized in usual manner.
rubber or other composition is thus vulcanized on the porous surface of the gold leaf;
the rubber will enter the porous gold, and when removed from the vulcanizer and
mold the gold will be found firmly united to the vulcanite.
With a stiff brush any loose portions of the gold may be removed from the dental
plate, and a fine burnished gold surface will remain.
This gold lining of the dental plate if properly made will be found to adhere
firmly to the vulcanite and can only be removed by cutting or grinding away the
gold.
Referring to the Drawings:
Figure 1, represents a plan of the non-conducting plate with gold leaf and confining
frame and the battery wires attached.
Figure 2, is a cross-section of same.
Figure 3, is an enlarged section of the gold leaf with porous surface.
Figure 4, is a section of a gold lined dental plate.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. The method of producing a metallic lining for dental plates which consists in
protecting one side of a burnished leat of metallic foil and making an electro deposit
on the other side only, and afterward vulcanizing a dental plate on the porous or
electro-deposited surface of the leaf or foil, substantially as described.
2. The gold lining or foil.for dental plates consisting of a metallic leaf burnished on
one surface and having one spongy surface like an electro deposit of metal, substantially
as described.
3. A vulcanized dental plate having its surface wholly or partly covered with a
single metallic foil which has a burnished outer surface, and a rough and porous
surface firmly united mechanically with the vulcanite, substantially as described.
Dated this 9th day of October 1888.
JOHN ANDREW DALY.
By Jensen & Son,
77, Chancery Lane, London, W.C.,.
Patent Agents.