A Carrier or Holder for Material for Taking the Impression or Mould of Jaws for Dental Purposes.
Year: 1894

page_text: Date of Application, 3rd Dec., 1894-Accented, 12th Jan., 1895
UUMI LEIE DRE
A Carrier or Holder for Material for Taking the Impression or
Mould of Jaws for Dental Purposes.
I. ISIDOR JOSEPH GUDENDAG, Surgical Instrument Manufacturer, of 17 Rue
de l'Odéon, Paris, France, 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 :-
The present invention relates to an apparatus or instrument for the use of
dentists, which instrument consists in a carrier or holder for material for taking the
impression or mould of jaws, with a circulation of a cooling or refrigerating liquid,
for the purpose of instantaneously cooling the material, during its contact with
the jaw.
The instrument is illustrated in the accompanying drawing, in which:
Fig. 1 is a plan view.
Fig. 2 is a cross section on line A. B. of Fig. 1. and
Fig. 3 another cross section on line C. D. of such fig.
A
The instrument is made of any suitable metal or other material, and is in the
form of a semi-circular basin, open in front, hollowed out in the interior, and of
which the interior hollow is divided into two compartments b, and b¹, by a
partition c, arranged at the central point of the hollow, and at the meeting point of
the said two compartments. The centre of the basin forms a kind of swelling
terminating in a crest, of which the forward part is also hollowed out so as to
constitute a channel of communication between the compartments b, and b.
tube d serves to cause the cooling liquid to enter compartment b, and another tube i
allows the same liquid to escape from the compartment 5', which it has entered,
A semi-circular
passing from compartment by the intermediate channel h.
crown a surrounds the carrier basin, its object being to support the material for
taking the impression, and of limiting its expansion. Finally, a flat handle g serves
to hold the apparatus in the hand.
The apparatus is used in the following manner :-
When desired to take an impression of any jaw, the substance to take the
impression, which is ordinarily wax or a composition having a base of wax, is first
softer ed by heat, and then placed in the exterior part of the semi-circular basin of
the carrier or holder, and the apparatus thus prepared is placed n the jaw of which
the impression is to be taken. A jet of cooling or refrigerating liquid is at once
introduced through tube d, and instantly circulates in compartment b, then passes
by the communicating channel and enters the inner compartment b', in which it in
turn circulates, and finally escapes to the outside by the tube f. (The travel of the
liquid is indicated by arrows in the drawing.)
It will be seen that the cooling liquid entering the carrier or holder at the
precise moment, when the impression material is being applied, will produce the
instantaneous cooling of this material, and the impression is in this way fixed with
great rapidity and with absolute exactitude.
The employment of this process results in avoiding prolonged contact of the
apparatus with the jaw of the patient, and in obtaining on the impression substance
an exact reproduction of all the details which it is essential to procure in operations
of this nature.
It is a known fact that by the system bitherto employed the impression material
only cooling slowly, on account of the absence of an immediate cooling action, it

page_text: results that the patient is obliged to allow the apparatus to remain for a certain
period of time on his jaw, and that further consequent on the slowness of cooling,
the substance employed is liable to undergo contraction, depriving the impression
obtained of its essential qualities of exactitude, which may result in the operation
having to be repeated, or in the impression having to be touched up, etc.
The instrument described may be of various dimensions and of any form, as it
has to be employed for jaws of all forms and sizes.
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 :-
In a carrier or holder for substances to take impressions of jaws, made of any
suitable metal or other material, the combination of two inner compartments
separated by an intermediate partition and being however connected together by a
communicating channel, the two said compartments being provided one with an
entrance, and the other with an exit tube, such combination having for its object to
cause the entrance and circulation in the interior of the instrument, during the
taking of an impression, of any refrigerating or cooling liquid, so as to produce the
instantaneous cooling of the impression substance, all substantially as and for
the purpose specified, and as shown in the accompanying drawing.
Dated this 3rd day of December 1894.
ALLISON BROS.,
Agents for the Applicant.