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Патент USA US2113223

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April 5, 1933-’
Filed Nov. 8, 1935
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Patented Apr. 5, 1938
2,113,223 ’
Sody Salabes, Baltimore, Md.
Application November 8, 1935, Serial No. 48,934
1 Claim. (01. 204-6)
The present invention relates in general to a
method of making dental trays for taking oral
adequately provide for the size and form of the
required impression.
impressions as apreparatory step to making dentures and particularly to impression trays with
5 water cooled walls.
One object of the invention is to provide a
quick cooling tray of less bulk and of less weight
than those in present use, so as to facilitate positioning of the tray in the patient’s mouth and to
‘10 lessen discomfort to the patient.
Anther object is to provide a tray having positive cooling means, so that the impression material will be properly and quickly cooled. The
manner of cooling the oral parts and the tray by
The tray walls ID are hollow and continuous,
forming a chamber consisting of outer walls H
and inner walls l2, joined at their margins, and 5
in spaced relation to each other, the space 13 be
tween them providing for the circulation of the
cooling medium. The tubes 14 and I5, respec-,
tively, are inlet and outlet connection tubes for
the circulation medium. These tubes may be 10
made integral with the tray or they may be ?xed
in place after the tray is made- These tubes are
15 means or" a spray of cool water projected into the
patient’s mouth is unsatisfactory, uncertain and
untidy. The cooling of the tray of this invention
is provided for by the circulation of a cooling
medium throughout hollow tray wa11s.
Another object of the invention is to provide for
20 bracing the thin tray walls to strengthen them
and to provide locking means for retention of the
impression material in the tray when in use,
Other objects and advantages of the tray will
be apparent from the following description in
25 connection with the accompanying drawing
which illustrates a preferred embodiment of the
invention, it being understood that detail changes
held in ?xed relative position by the brace l6.
The outer wall H and inner wall [2 are stifl
ened and strengthened by means of a plurality of 15
tubuhlres ll, Which are of comparatively Small
diameter. The Walls of the tubulllres are coil
tinuous With the inner and outer Walls of the
tray. When the impression material, in a warm
plastic State, is’ pressed in the trey, it ?lls these
tubuluree and When the impressieh materiel 2'0
cools and hardens, it is locked into Position by
means of the hardened material in the tubulures,
that is to say, when the soft impression material
iS pressed. against the Oral part to be modeled the 25
material is also forced into the tubulures and
hardening, as it 00018, the tray may be removed
from the petient’s mouth Without displacement
and variation in shape may be made without of the material by the resultant suction action of
departing from the scope or spirit of the in- such removal and without damage to the delicate 30
30 vention.
contours of the impression. Models made from
In the drawing:
_ such impressions will very closely approximate to
Figure l is a View, in perspective, of a tray the general con?guration and character of the
made by the method of the invention, showing pert impressed
inlet and outlet connections for the cooling meThe tllblllures '1 may be of Simple Cylindrical 35
35 dium.
shape or they may be made of truncated conical
Figure 2 is an enlarged fragmentary View in form to provide for better anchorage. It is un
section taken on line z__2 of Figure 1_
derstood, however, that the tubulures may be
Figure 3 is an enlarged fragmentary View in omitted altogether in some trays where they are
40 section taken along line 3-3 of Figure 1.
Figure 4 is a side elevation of the device illus-
trated in Figure 1.
The tray shown in Figure l is used for taking
impressions of part of the oral cavity so that
45 from the impression thus obtained, a denture
may be produced which will conform with great
precision to the con?guration of the part im'
presselt By denture, in this connection, will be
understood such dental appliances as are in gen-
5° erel use to replace or provide teeth or parts Where
they are needed and may take the form of crowns,
bridges, entire or partial plates or such other devices as are in use in oral and dental surgery and
55 it is understood that the tray is so fashioned as to
not deslred'
The method °f mak‘hg the trays “mphses the
following steps:
A mold for the tray core is ?rst made. This
mold may be of any suitable plastic material,
plaster of Paris, metal, wood or any moldable 45
material. This mold is made so that it approxi
mates the general form and size of the part of
which the impression is to be taken, due allow
ance being made for the bulk of the impression
material itself. '
A fusible alloy or material of low melting point
is melted and poured into the mold. When this
has solidi?ed, which with such materials is gen
erally almost immediately, the molded core is
removed from the mold and is ready for the next 55
step in the process. I have found that Lipowitz‘
alloy, which is a well known composition of lead,
tin, cadmium and bismuth gives an excellent re
sult, although other alloys and suitable compo
sitions may be used. While a mold has been de
scribed for casting the core, the core may be made
directly from the fusible materials by working,
stamping, carving, or other means.
The alloy core is next pierced with a number
of small holes of the order of one sixteenth of an
inch in diameter, the purpose of which will be
made apparent below. While these holes are not
essential to the method, they add to the useful
ness, durability and ef?cacy of the ?nished tray.
The cast alloy core is next immersed in an
electro-plating bath and thinly plated with a
metal which is both tough enough and strong
enough to maintain its shape when the tray is
ing medium to be circulated therethrough is sup‘
plied and conducted away. These inlet and out
let connections may be made integral with the
tray itself, if desired, by casting a mold for them 10
with the molded core, although it has been found
expedient to a?ix them after the tray walls have
been produced. The inlet and outlet openings
serve also to permit the discharging of the core
material after the plating operation.
Trays made by this method are light-walled,
rigid, strong, durable, inexpensive and more
satisfactory for the purpose than those used here
Walls, and is both cheap and durable. Other
metals such as nickel, chromium, cobalt, silver,
Having thus described the invention, what is 20
claimed is:
The process of forming a dental tray to ?t the
and. gold or other material may be used. I have
manner as described above.
The tray is now ready to receive the inlet and
outlet connections by means of which the cool
completed and in use. I have found copper plat
20 ing gives an excellent result with light, strong
through the hollow-walled portion of the tray
and also afford means whereby the impression
material is anchored to the tray in a satisfactory
found electro-plating of the mold entirely satis
factory, although other plating methods may be
used such as dip coating, spraying, swaging or
combinations thereof under suitable conditions,
and with suitable materials.
The plating step having been completed the
next step is the discharging of the low melting
point metal alloy by fusion in a water bath of
proper temperature or other bath or by means
of heating the tray with the core, above the melt
This leaves the
metallic hollow-walled sheath or shell conform
ing most closely to the con?guration of the core.
The walls of the holes referred to above having
35 ing point of the fusible core.
also been coated in the plating bath, form
40 tubulures in the tray which act as braces passing
oral cavity comprising, forming a core mold ma
terial with an electric conducting surface into a
required shape for forming a dental tray with 25
openings for inlet and outlet of a cooling medium,
providing a multiplicity of small holes there
through of a size suf?cient to produce when de
posited upon stiffening members serving to lock
and effect rapid cooling of impression material .30
to be used therein, immersing said core in a metal
plating bath wherein the material of a higher
melting temperature than the material of the
core is deposited around said core and the holes
therein, then subjecting said coated core to a 35
means for melting said core but not melting said
deposited metal thus permitting said core mate
rial to escape through said inlet and outlet
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