Improvements in Artificial Teeth.
Year: 1892

page_text: Date of Application, 8th Sept., 1892-Accepted, 8th Oct., 1892
GUMI DELM OF MULTIVATION.
Improvements in Artificial Teeth.
I, CHARLES FREDERICK RUTTERFORD, of 11 Poland Street, W., in the County
of Middlesex, Dentist and Dental 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:-
My invention relates to the construction of artificial teeth, which are formed with
a cavity or recess on the underside and are affixed to a natural root, an artificial
plate, bar, or bridge, by filling the said cavity with cement, or other suitable
material and placing the tooth upon a pin, peg, post, or similar device, attached to
the said natural root, plate, bar, or bridge.
The cavity or recess, above mentioned, having invariably been made round, any
great lateral pressure causes the tooth to twist on the pin, peg, or post, and this
method of attachment is therefore not altogether satisfactory in practice.
The object of my invention is to effect an improvement in the construction of
such artificial teeth and of the pin, post, or peg used therewith, whereby the above
objection is removed and they are able to be attached in a better and more secure
manner than heretofore.
In the accompanying sheet of drawings,
Fig. 1 is a side elevation, partly in section, of an artificial tooth, constructed in
accordance with my invention,
Fig. 2 is a front elevation, partly in section, of the same,
Fig. 3 is a plan of the underside of the tooth, and
Fig. 4 is a side sectional elevation, showing the said tooth attached to a natural
root.
The figures are all larger than the actual size for the sake of clearness and
similar letters of reference denote similar parts throughout the drawings.
A is the artificial tooth, having a cavity B formned in its underside, of a flattened
oval form in cross section, as shewn most clearly in the plan Fig: 3.
This cavity may be of a simple oval, or of a rectangular form, but in practice I
prefer the flattened oval form, as shewn.
C is a pin, or peg, conforming in cross-section to the shape of the cavity B. It
is inserted into a cavity formed in the natural root D, and secured therein by
cement or other suitable means in the usual way; and the cavity B in the artificial
tooth is then filled with cement and the said tooth placed upon the projecting end
of the pin C. If preferred the piu may be first cemented into the tooth A and then
inserted into the root.
By reason of the form of the cavity B and of the pin C, the twisting or rotation
of the tooth A upon the said pin is effectually guarded against, and when used in
connection with a natural root, as shewn, less of the dentine need be cut away to
make room for the pin, as its flattened oval form, approximates very nearly to the
natural shape of the nerve pulp cavity, into which it enters.
If the artificial tooth is to be affixed to a plate, bar, or bridge, the long pin C,
shown in the drawing, will not be required, but a short pin, or post, will be soldered,
or otherwise attached to the plate, bar, or bridge, and the tooth fixed thereon in the
same manner as before described. It is however essential that the said short pin,
or post, be of flattened oval, oval, or rectangular section, to conform to the section
of the cavity in the artificial tooth.
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. An artificial tooth, having a cavity formed in the base, of a flattened oval,

page_text: oval, or rectangular shape in cross-section, substantially as and for the purpose
herein set forth.
2. The combination of an artificial tooth, having a cavity formed in the base, of
a flattened oval, oval, or rectangular shape in cross-section, and a pin, peg, or post,
corresponding in cross-section to the aforesaid tooth cavity and adapted to be
secured therein by cement or other suitable means, substantially as and for the
purposes herein set forth.
3. The combination of an artificial tooth, having a cavity formed in the base, of
a flattened oval, oval, or rectangular shape in cross-section, a natural tooth root
and a pin or peg, corresponding in cross-section to the aforesaid tooth cavity,
inserted partly in the said root and partly in the cavity in the said artificial tooth,
and secured therein by cement or other suitable means, substantially as herein
set forth.
4. The combination of an artificial tooth, having a cavity formed in the base, of
a flattened oval, oval, or rectangular shape in cross-section, a plate, bar, or bridge,
and a pin or post, attached thereto, corresponding in cross-section to the aforesaid
tooth cavity, and adapted to be secured within the said cavity by cement or other
suitable means, substantially as herein set forth.
Dated this 7th day of September 1892.
AMBROSE MYALL,
21, Cockspur Street, London, S.W., Agent for the Applicant.