Shaded Dental Rubber.
Year: 1888

page_text: Date of Application, 4th Sept., 1888
Complete Specification Left, 4th June, 1889-Accepted, 27th July, 1889
Shaded Dental Rubber.
I ALFRED JOSEPH GEAR of No. 9 South Side Clapham Common in the County of
Surrey Surgeon Dentist do hereby declare the nature of this invention to be as
follows
Whereas the Dental Rubbers now in use for the setting of artificial teeth are of
one uniform colour or mottled and have a hard unnatural appearance in the mouth.
My invention consists of the blending together of the ordinary pink and white
dental rubbers in a graduated form so as to produce a shaded dental rubber the
lighter edge of which being placed in contact with the teeth gives a softer and
more natural appearance than the dental rubbers at present in use and as an
alternative method I arrive at the same result by adding to caoutchouc the necessary
amount of sulphur for vulcanising purposes with the addition of colouring matter in
graduated quantities.
Dl
1
1000
ALFRED JOSEPH GEAR.
COMPLETE SPECIFICATION.
Shaded Dental Rubber.
I ALFRED JOSEPH GEAR of No. 9 South Side Clapham Common in the County of
Surrey Surgeon Dentist, do hereby declare the nature of my said invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
Whereas the Dental rubbers now in use for the setting of artificial teeth are of an
uniform color or mottled and have a hard unnatural appearance in the mouth. My
Invention consists of the production of a shaded dental rubber which when vulcanised
and polished in the ordinary way is to be used for artificial gums the lighter edge of
which being placed in contact with the teeth gives a softer and more natural
appearance than the dental rubbers at present in use.
I now proceed to describe the way in which I manufacture my shaded rubber I first
make a sheet of very pale pink rubber either by the admixture of the ordinary pink
and white dental rulibers in the approximate proportions of one part of pink dental
rubber to three parts of white dental rubber or by mixing caoutchouc with the
necessary amount of sulphur for vulcanizing purposes and adding coloring matter so
as to form a very pale pink rubber. I then make another sheet in the same way but
add a little more of the ordinary pink dental rubber or pink coloring matter to get a
slightly darker shade I continue to make sheets in this way but gradually making
them darker in color until the deepest shade of pink required is arrived at which
deepest shade is the ordinary pink dental rubber now in use. 1 next place upon the
lightest sheet the sheet next darker in color and so on until a thick block is formed
this is then passed between rollers or other suitable machinery employed to give a
gentle pressure so as to bring the sheets of rubber into perfect cohesion with each
other.
After this operation is performed I cause this block to be cut transversely into strips
or narrow sheets such strips being of the thickness and width convenient for packing
in the flask previous to vulcanising it.
My shaded dental rubber can be used either by itself or as a coating over the
ordinary dental rubbers for the manufacture of gums and palates.

page_text: 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 I do not
claim any exact proportions in the mixing of the several layers of dental -rubber
but that what I claim is
The making of Shaded Dental Rubber substantially in manner above described.
Dated this 3rd day of June 1889.