Fastening for Artificial Teeth.
Year: 1893

page_text: Date of Application, 25th Aug., 1893
Complete Specification Left, 22nd May, 1894-Accepted, 23rd June, 1894
PROVISIONAL SPECIFICATION.
Fastening for Artificial Teeth.
I, FRIEDRICH AUGUST WIENAND, Surgeon Dentist, of Pforzheim, in the'
German Empire, do hereby declare the nature of this invention to be as follows:―
This invention relates to the means of fastening artificial teeth, usually made of,
felspar, silica, kaolin or other hard mineral matter, to the case, plate, or artificial.
gum, which is made of softer material and forms a base or support for the artificial.
teeth.
Instead of fixing the tooth to its supporting base by means of wires, as usual,
I make an eyelet-shaped plate of platinum, provided with a shoulder and a dove-
tailed or bevelled or otherwise shaped pin or dowel which is fixed to the back of
the tooth in the course of its manufacture, that is when the tooth mass is still soft,
by pressing the said pin or dowel into the mass of the tooth, so that the shoulder.
abuts against the back of the tooth, and the eyelet plate projects at a right angle,
to the same, the plane of the eyelet plate being preferably horizontal, if the back
of the tooth is vertical.
In fixing the tooth to its base, the projecting eyelet plate and shoulder is worked
into the material of the supporting base or case, such as indiarubber or celluloid,
when still soft, so that the said material penetrates into or through the eyelet hole.
The slanting top of the tooth, that is the surface opposite to its cutting edge, is,
provided with a pair of triangular recesses or grooves converging towards each,
other and extending from the back half way to the front of the tooth, into which
grooves the material of the supporting plate penetrates when the tooth is being.
fixed to the same, thus forming an additional connection or fastening between the
tooth and its case.
For applying such a tooth to a gold or other metal jaw or case, a rectangular
plate somewhat smaller than the back of the tooth, is provided with a slot of such
a width and length, that the eyelet plate of the tooth will pass through it. The
said rectangular plate or backing is then fitted over the eyelet, soldered on, and the
projecting part filed down until the eyelet plate is flush with the backing.
Teeth fastened by these means offer much greater resistance to twisting or
turning, than those fastened by means of wires, and are generally more durable.
Dated this 25th day of August 1893
FAIRFAX & WETTER,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Fastening for Artificial Teeth.
I, FRIEDRICH AUGUST WIENAND, Surgeon Dentist, of Pforzheim, in the
German Empire, 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 the means of fastening artificial teeth usually made of
felspar, silica, kaolin or other hard mineral matter, to the case, plate or artificial
gum, which is made of softer material and forms a base or support for the artificial
teeth.
In the following description reference will be made to the accompanying drawing,
.

page_text: Fig. 3 is a section along line M-M of Fig. 1,
Fig. 4 is a section along line N-N of Fig. 1,
Fig. 5 is a vertical section of a tooth and fastener, together with its supporting
plate and the adjoining parts of the upper gums;
Figs. 6 to 8 illustrate various stages of manufacture of an artificial tooth mounted
on a metal plate.
Instead of fixing the tooth to its supporting base by means of wires, as usual,
I make an eyelet shaped plate (A) of sheet-platinum, provided with a shoulder b
and a dove-tailed foot or dowel d which is fixed to the back of the tooth in the
course of its manufacture, that is, when the tooth mass is still soft, by pressing
the said foot or dowel d into the mass of the tooth, (Figs. 4 and 7), so that the
shoulder b abuts against the back of the tooth, the eyelet plate being preferably
horizontal, if the back of the tooth is vertical. After the said foot d has been
introduced into the tooth-mass, as described, the two parts are secured together by
heat (in the process of baking).
In fixing the tooth to its base, a Fig. 5, the projecting eyelet plate A and
shoulder is worked into the material of the supporting base or case, such as india-
rubber or celluloid, when still soft, so that the said material penetrates into or
through the eyelet hole.
The slanting top of the tooth, that is, the surface opposite to its cutting edge, is
provided with a pair of triangular recesses or grooves B Figs. 1 and 3, converging
towards each other and extending. from the back about half way to the front of the
tooth, into which grooves the material of the supporting plate penetrates, when the
tooth is being fixed to the same, thus forming an additional connection or fastening
between the tooth and its case.
Instead of being dove-tailed, the foot, pin or dowel d may have any other shape,
suitable to retain the fastener in the tooth mass.
For applying such a tooth to a gold or other metal jaw or case, a plate D, Fig. 6,
is provided with a slot e of such a width and length, that the eyelet-plate 6 of the
tooth will pass through it. The said plate or backing D is then fitted over the
eyelet, Fig. 7, soldered on, and the projecting eyelet part A filed down, until it is
flush with the backing D.
Teeth fastened by these means offer much greater resistance to twisting or
turning, than those fastened by means of wires, and are generally more durable.
The new metallic fastening is applicable to all kinds of artificial mineral teeth,
both for upper and for lower jaws.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A metallic fastening for artificial teeth comprising an eyelet (A) provided
with a shoulder b and a dowel or foot d, the said foot being adapted to secure the
said eyelet in the tooth mass, while the projecting part of the eyelet serves to
incorporate the eyelet with the substance of the case or supporting plate,
substantially as described with reference to Figs. 1 to 5.
2. A tooth fixed to the supporting plate or case by means of a metallic eyelet
piece A constructed and arranged as described, and provided with grooves (B)
adapted to serve as an additional connection between the tooth and the base (a).
3. A device for fixing artificial teeth upon a metallic plate, consisting of a
metallic fastener 6 fitting into a slot of the said metal plate and provided with a
retaining foot or dowel d, substantially as described with reference to Figs. 6 to 8.
Dated this 22nd day of May 1894.
FAIRFAX & WETTER,
433, Strand, London, Agents.