Improvements in and relating to Dental Appliance for Taking Impressions of the Gums in the Production of Artificial Teeth.
Year: 1899

page_text: Improvements in and relating to Dental Appliance for Taking
Impressions of the Gums in the Production of Artificial Teeth.
I, WALTER DICK HAY, of 41, Abbotsford Place, in the County of the City of
Glasgow, Surgeon Dentist, do hereby declare the nature of this invention to be
as follows:-
The appliance presently in use-known as the impression cup-for taking
impressions of the gums of either the upper or lower jaw by means of a warm
plastic composition consists of a hollow receptacle, in which the composition is
placed, formed of thin sheet metal, usually brass, and conforming more or less to
the shape of the gums. This form of impression cup has in no way hastened the
setting of the warm plastic composition during the process of taking an impression
of the gums, the consequence has been that the patient or sitter has been sub-
jected to an objectionable, and inconveniently long period of time required for
the setting with the composition on the palatal side of the mouth.
In order to overcome this painful defect. I construct the impression cup of the
usual shape and configuration but with an internal hollow, or water jacketted
space terminating at the handle or thumb and finger piece with an inlet and out-
let port which I connect by suitable rubber tubing, provided with a suitable
spring clasp arrangement with a suitable source of cold water supply or freezing
mixture. In any suitable position of one of the two rubber tubes connecting the
cold water or other circulation I interpose an elastic ball, which being compressed
sets up an active circulation of cold water or other fluid medium which cools the
plastic composition in order to set it, in a very quick period of time.
Dated this 14th day of September 1899.
J. H. PEARSON,
Applicant's Agent,
Improvements in and relating to Dental Appliance for Taking
Impressions of the Gums in the Production of Artificial Teeth.
I, ELIZA HAY, of Sunnyside, Uddingston, in the County of Lanark, Legal
Representative and Executrix under the will of Walter Dick Hay, of 41, Abbots-
ford Place, in the County of the City of Glasgow, Surgeon Dentist, deceased, 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 appliance presently in use known as the impression cup or tray for taking
impressions of the gums of either the upper or lower jaw by means of a warm
plastic composition consists of a hollow receptacle, in which the composition is

page_text: placed, formed of thin sheet metal, usually brass, and conforming more or less to
the shape of the gums. This form of impression cup has in no way hastened the
setting of the warm plastic composition during the process of taking an impression
of the gums, the consequence has been that the patient or sitter has been sub-
jected to an objectionable and inconveniently long period of time required for
the setting with the composition on the palatal side of the mouth.
In order to overcome this painful defect I construct the impression cup or tray
of the usual shape and configuration, but with an internal hollow or water
jacketted space, terminating at the handle or thumb and finger piece with an
inlet and outlet port which I connect by suitable rubber tubing, provided with a
suitable spring clasp arrangement with a suitable source of cold water supply or
freezing mixture.
In any suitable position of one of the two rubber tubes connecting the cold
water or other circulation I interpose an elastic ball, which being compressed
sets up an active circulation of cold water or other fluid medium which cools the
plastic composition in order to set it in a very quick period of time.
In order that my invention may be properly understood and readily carried
into effect I have hereunto appended one explanatory sheet of drawings in which
Figure 1, is an inverted plan of the impression cup or tray used in taking an
impression of the upper jaw.
Figure 2 is a longitudinal section of the same taken in its normal position,
and
Figure 3 is a general view of the apparatus consisting of the tray (which is
shown in side elevation), rubber tubing, collapsible ball, and vessel for containing
the cooling medium. A is the tray, B the thumb and finger piece, C is a clasp
for ready attachment and detachment of the inlet tube D and discharge tube E
of the cooling circulation. F is the collapsible ball by which the cooling medium
is rapidly forced into the tray by the inlet passage G and circulating or water
jacketted spaces H, and escaping by the outlet I as seen in Figure 2. J contains
the cooling medium which conveniently may be cold water or some suitable
freezing mixture. K is a hook or catch by which the container J is hooked on
to the pocket of the operator, or to the dental chair.
.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
:-
1. In dental appliance for taking impression of the gums of the upper and lower
jaw, a water jacketted space formed in the tray with inlet and outlet ports in
connection with tubes for conveying the cooling medium, having a collapsible
ball for controlling the flow of the said cooling medium, and a reservoir or tank
for containing the said cooling medium substantially as described and shown on
the accompanying sheet of drawings.
2. The general arrangement and combination of parts operating substantially
as and for the purposes herein before described and shown on the accompanying
sheet of drawings.
J. H. PEARSON,
Applicant's Agent.