Year: 1887

page_text: Date of Application, 3rd Feb., 1887.
Complete Left, 18th June, 1887.
Complete Accepted, 22nd July, 1887
I, JOHN STEWART, of 3 South Lindsay Street, Dundee, Forfarshire, Dental Surgeon,
do hereby declare the nature of my invention to be as follows:-
My Invention comprises a new or improved mode and means of mounting artifical
teeth and construction of their palate plates, which will take a firmer hold on the roof
of the human mouth, and be more comfortable for use, than such mounts and palate
plates have been as heretofore constructed.
The nature and novelty of my invention consist all as follows:-The teeth are
secured to gold, silver or other metallic wires as usual, to the form of the mould, and
first embedded in a thin layer of the rubber mixture to form vulcanite in imitation
of the gums close down to the teeth, which is then fired to the desired hardness to
hold the whole firm and secure in the true shape. After which I then embed this in
the mould fitted with a thin layer of plastic rubber all over the palate, and bearing or
seat for the upper part of the gums, which is then vulcanized to the desired extent,
leaving the whole of this last layer of the mount quite soft and clastic, although
sufficiently vulcanized to maintain its shape, which thus fits the guns and palate in a
much more soft and comfortable manner than with mounts wholly made of hard
vulcanite as is usual. Two suction chambers or vacuum recesses, are by my improve-
ments formed in the palate plate, one on each side of the highest central convex part
of the plate; which has the effect, when the plate is pressed up against the roof of the
mouth, of making it firmly adhere thereto, and prevent any rocking action in the mouth,
such as has been the case in palate plates heretofore constructed with only one central
suction or vacuum chamber; and the whole roof plate being elastic around the vacuum
chambers also causes these to hold much better to the roof of the mouth than has been
the case with the rigid suction chambers heretofore in use.
Instead of making the mount at two operations with the lower layer next the teeth
hard, and the upper soft, the plastic rubber may be all put in the mould at the same
time, either of the same mixture or of different mixtures, for forming the roof and
the gum parts, and have the teeth embedded in the plastic mixture, and all vulcanized
and furnaced to the desired soft elastic quality without the hard layer of vulcanite next
the teeth first described.

page_text: COMPLETE SPECIFICATION.
Improvements in Mounts for Artificial Teeth.
I, JOHN STEWART of 3 South Lindsay Street, Dundee, Forfarshire, Dental Surgeon,
do hereby declare the nature of my invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement in writing reference being had to the accompanying sheet of Drawings, and
to the letters and figures marked thereon; that is to say:-
My said Invention comprises a new or improved mode and means of mounting
artificial teeth, and construction of their palate plates, which will take a firmer hold on
the roof of the human mouth, and be more comfortable for use, than such mounts and
palate plates have been as heretofore constructed.
And in order that my said Invention, and the manner of performing or carrying the
same into effect or practice may be properly understood, I have hereunto appended an
explanatory sheet of Drawings, in which the same reference letters are used to indicate
corresponding parts in all the figures where shown. Figures 1 and 2 are a sectional
elevation and plan respectively of the lower part of the stucco mould C, and its box (¹
the former taken on the line I--- 1 of Figure 2, and both lying at an angle, showing
the teeth A and the metallic wire a in the mould B, all as taken from the modelled
wax palate formed on the stucco cast B of the palate and gum, of the person to which
the teeth A are to be fitted, and which cast B, is shown as formed or embedded in the
upper part B of the mould box B, C, shown in sectional elevation and plan in
Figures 3 and 4, the former taken on the line 2---2 in Figure 4, showing the two
metallic segmental thin plates b, b, fixed in the mould B for forming the segmental suction
chambers or vacuum recesses b', ', in the palate. The stucco cast B, and upper part B¹
of the mould B are shown as dotted in and closed on the under part C, C, of the
mould B, C, in Figure 1, leaving the space over the teeth A and wire a, as dotted
in at c, c', for the thickness of the vulcanized rubber to be compressed and shaped and
furnaced to form the actual mount with its set of teeth A., and new or improved suction
chambers and vacuum recesses b', 6', as shown in perspective side view in Figure 5,
as removed from the complete moulds B, B', and C, C, after being valcanized and
furnaced.
:
Referring to these Drawings, the nature and novelty of my invention consist all as
follows: As seen in Figures 1 and 2 the teeth A are secured by wire pins a¹ to the
gold, silver, platinum, or other dental metallic segmental wire a as usual, to the form
of the cast B shown in the mould box B¹ taken from the impression of the mouth and
palate of the person to which the mount is to be fitted, and from which with the wax
model on it the cast and under mould is taken, shown in the mould box C³,
Figures 1 and 2, with the teeth A imbedded in it. Into this stucco cast or mould C,
a thin layer or strip of the plastic rubber mixture to form vulcanite in imitation of the
gums is first embedded. at c, and compressed by closing the moulds or flasks B', C¹,
Close down over and around the front of the teeth A to form the outer gum of a pink
colour, indicated at c in Figure 5, and of a consistency that when vulcanized and

page_text: furnaced it assumes the necessary hardness to hold the teeth A, and whole mount firm
and secure in the true shape of the cast, and this vulcanizing may either be done
partially first, or afterwards as hereinafter described. After this insertion of the hard
gum part c, I then embed over this in the mould B a thin layer of red plastic
rubber to simulate the colour of the palate or inside of the mouth cut to an
approximate shape and thickness, as indicated in Figure 6, all over the palate part of
the mould C as indicated at c¹ in Figure 1, and close the mould and compress this
layer so as to form the true bearing or seat for the upper part of the gums and palate,
and of a consistency that when furnaced and vulcanized to the desired extent it leaves
the whole of this last layer c' of the mount quite soft and elastic, although sufficiently
vulcanized to maintain its shape which thus fits the gums and palate in a much more
soft and comfortable manner than with mounts wholly made of hard vulcanite as is
usual. Two suction chambers or vacuum recesses 61, 61, are by my improvements
formed in the palate plate c¹, one on each side of the highest central convex part 62 of
the palate, by the plates b, b, for the purpose, inserted in the cast or mould B, shown
in Figures 3 and 4. These improved suction chambers or vacuum recesses b¹, b¹, have
the effect, when the plate e¹ is pressed up against the roof of the mouth, of making the
whole firmly adhere thereto, and prevent any rocking action of the mount and teeth
in the mouth, such as has been the case in palate plates horetofore constructed with
only one central suction or vacuum chamber; and the whole roof plate c¹ being elastic
around, as well as the vacuum chambers 61 61, also causes these to hold much better to
the roof of the mouth than has been the case with the single rigid suction chamber
heretofore in use.
2
Instead of making the mount at two operations with the lower layer next the teeth A
hard and the upper soft, the plastic rubber may be all put into the mould at the same
time, either of the same mixture or of different mixtures, for forming the roof and the
gum parts, and have the teeth A embedded in the plastic mixture, and all vulcanized
and furnaced to the desired soft elastic quality, either with or without the hard layer of
vulcanite next the teeth A first described.
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 :-
:-
First. The mode and means of mounting artificial teeth, and forming the palate part
of their plates of an elastic rubber construction, with two suction chambers or vacuuin
recesses on the opposite upper side of the palate, all substantially as and for
the advantages herein described, in reference to and shown in the accompanying
Drawings.
Second. In vulcanized rubber mounts for artificial teeth, the forming of two suction
chambers or vacuum recesses, on the opposite upper sides of the palate plate, substan-
tially as and for the purposes and advantages herein described in reference to and
shown in the accompanying Drawings.
Third. In vulcanized rubber mounts for artificial teeth, the making of the bearing
part and palate of a softer and more elastic nature than the part under the gums next
the teeth, substantially as and for the purposes and advantages herein described, in
reference to and shown in the accompanying Drawings.
D
1011
f T 1007