Improvements in Artificial Teeth.
Year: 1889

page_text: Date of Application, 11th Oct., 1889
Complete Specification Left, 11th Aug., 1890-Accepted, 13th Sept., 1890
PROVISIONAL SPECIFICATION.
Improvements in Artificial Teeth.
I, ROBERT BREWSTER, of 6 to 10 Lexington Street, Golden Square, London, W.,
Manufacturer, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improvement in mineral teeth.
Mineral teeth incisors especially as at present constructed have fixed to them a
wire or wires or they have a metal tube running through their entire length by
which means they are attached to the vulcanite or other base but these systems have
many inconveniences. Various forms of mineral or artificial teeth have also been
designed for vulcanite or other plastic base without wires or metal attachments of any
kind but all of them possess grave faults as they have to be inserted a considerable
distance into the material forming the base, which weakens the latter and necessitates
it being inconveniently thick and the material of the base has to project up on
the outsides of the teeth to obtain a firm hold of them which is unsightly.
According to this invention I form a cylindrical hole in the base of the tooth or
preferably this hole is undercut becoming larger as it enters the tooth and at the
back of the tooth 1 cut away the wall of this cylinder forming an opening into it.
When such teeth are fixed the vulcanite or other material of the base forms a-solid
column filling the interior of the tooth and this column is strengthened by a
buttress at the rear where the cylindrical wall of the tooth has been cut away.
Thus a very strong attachment is obtained whilst there is no necessity for the
material of the base to project up on the outside of the tooth, so that a very
natural appearance may be obtained. The aperture at the back of the tooth also
serves as a vent during the process of vulcanization.
When using these teeth as crowns on natural roots 1 cut the slot on the lingual
side higher than for vulcanite.
Dalad this 11th contahan 1000
CARPMAEL & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements in Artificial Teeth.
I, ROBERT BREWSTER, of 6 to 10 Lexington Street, Golden Square, London, W.,
Manufacturer, 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 relates to an improvement in mineral teeth.
Mineral teeth incisors especially as at present constructed have fixed to them a
wire or wires or they have a metal tube running through their entire length by
which means they are attached to the vulcanite or other base but these systems have
many inconveniences. Various forms of mineral or artificial teeth have also been
designed for vulcanite or other plastic base without wires or metal attachments of
any kind but all of them possess grave faults as they have to be inserted a considerable
distance into the material forming the base which weakens the latter and necessitates
it being inconveniently thick and the material of the base has to project up on the
outsides of the teeth to obtain a firm hold of them which is unsightly.
According to this invention I form a cylindrical hole in the base of the tooth or
preferably this hole is undercut becoming larger as it enters the tooth and at the
back of the tooth 1 cut away the wall of this cylindrical or other shaped hole forming
an opening into it. When such teeth are fixed the vulcanite or other material of
[Price 6d1

page_text: the base forms a solid column filling the interior of the tooth and this column is
strengthened by a buttress at the rear where the wall of the tooth has been cut away.
Thus a very strong attachment is obtained whilst there is no necessity for the
material of the base to project up on the outside of the tooth, so that a very natural
appearance may be obtained. The aperture at the back of the tooth also serves as
a vent during the process of vulcanization.
When using these teeth as crowns on natural roots I prefer to cut the slot on the
ingual side higher than for vulcanite.
In order that my said invention may be more fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed
1
4
Figure 1 is a vertical section.
Figure 2 is a back view, and
Figure 3 an underside view of an incisor tooth made according to my invention.
Figures 4 and 5 are a section and front view respectively of the same tooth set
in vulcanite.
Figure 6 is a section.
Figure 7 is a back view, and
Figure 8 an underside view of a molar tooth made according to my invention.
Figure 9 is a section illustrating the manner in which the teeth are fixed to
metal plates.
a is a hole in the base, in the tooth shown in Figures 1 to 5 it is cylindrical
and in that shown in Figures 6 to 8 it is undercut. 6 is the cut or opening made
at the back of the tooth, preferably this is. of dovetail section as shown.
base in which the tooth is set.
c is the
In Figure 9 d is a metal plate to which the pin e is soldered or otherwise fixed.
The tooth is fixed by filling the hole in it with cement or other stopping f. The
teeth are fixed as crowns to natural roots in a similar way, the pin e being in this
case fixed to the root.
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. Artificial teeth having a hole in the base, the wall of the hole being cut away
at the rear substantially as described.
2. Artificial teeth substantially as described and shown in the drawings.
Dated this 7th day of August 1900.
ROBT. BREWSTER.