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Патент USA US3059345

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Oct. 23, 1962
Filed April 6, 1960
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Oct. 23, 1962
Filed April 6, 1960
2 Sheets-Sheet 2
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FIG. ‘8
FIG. 7
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United States Patent C)
Grover C. Reynolds, 4401 Charlotte Ave.,
Nashville, Tenn.
Filed Apr. 6, 1960, Ser. No. 20,495
5 Claims. (CI. 32-19)
Patented Oct. 23, 1962
FIG. 2 is a side elevational view similar to FIG. 1,
with the plates in an intermediate pivoted position;
FIG. 3 is a view similar to FIG. 2 with the plates in
closed position;
FIG. 4 is a section taken along the line 4—-4 of FIG. 3;
FIG. 5 is a section taken along the line -5—5 of FIG. 3;
FIG. 6 is a section taken along the line 6—6 of FIG.
3, disclosing the upper support plate, transverse bar and
pivotal links in various operative positions;
This invention relates to a dental device for obtaining
FIG. 7 is a section taken along the line 7—7 of FIG. 3;
the centric relation of the jaws, and more particularly to 10
FIG. 8 is a section taken along the line 8-8 of FIG. 7.
such a device which may be universally adjustable.
Referring now to the drawings in more detail, and
In the conventional method of making a set of false
particularly to FIGS. 1-3, the upper plastic base plate ‘10
teeth for a patient, impressions of the person’s gums are
is for-med around the stone-like model 11 of the upper
made in soft plastic material such as wax. A harder
gum of the patient and secured to the upper surface of an
stone-like material in molten form is poured into the
upper ?at metal support plate 12. Holes 13 are provided
molds of the gums formed by the impressions and per
in the upper support plate 12 to permit the plastic material
mitted to set to form a stone-like reproduction or model
of the edentulous gums. Another pink plastic material,
such as wax, is pressed over the gum surfaces of the
stone-like ‘models for both the upper and the lower jaws
to form upper and lower base plates. A flat metal sup
porting plate is then placed against the outer surface of
each base plate opposite the gum surface in such a man
or wax of the base plate 10 to ?lter through the holes 13
and maintain a more secure bond between the base
plate 10 and the support plate 12. In a like manner, a
lower plastic base plate 14 forming an impression of the
lower gum on the lower stone-like model 15, is secured to
a lower ?at metal support plate 16 by means of holes 17
in the plate 16.
ner that the metal plates oppose each other in spaced
The upper support plate 12 is provided with depending
relation. The upper metal plate has a depending stylus, 25 parallel
?anges 20 and 21 on opposite sides thereof, each
While the lower metal plate has a thin layer of wax spread
a longitudinal slot '22 and 23, respectively.
over a small surface directly beneath the stylus. The
Also mounted on the upper support plate 12 toward the
plastic base plates and the supporting metal plates are
front of and along its longitudinal axis is a cylindrical
removed from their respective models and inserted into
stylus 24 adapted to- be adjusted in a direction normal to
‘the mouth of the patient and the gums inserted into the
the plane of the plate 12. The adjustment of the stylus is
cavities or impressions of the‘ plastic base plates. The
effected by teeth 25 spaced longitudinally along the surface
patient closes his mouth and chews, moving his lower
of the stylus 24 adapted to mesh ‘with a gear 26 supported
jaw laterally and back and forth to permit the stylus to '
trace a con?guration in the waxed surface on the lower
on the end of a shaft 27 rotatably mounted in bearing 28
metal plate. In all patients, the stylus describes a sub 35 ?xed to the bottom of support plate 12. The other end
of the shaft 27 is adapted to be manually rotated by means
stantially V-shaped path, known as a “Gothic Arch.”
a knurled disc or knob 2'9. Adapted to lock the stylus
‘The plastic base plates and the metal plates are then re
moved from the patient’s mouth and the models are re
placed in the impressions of the base plates. With the
24 in any adjusted vertical position is a set screw 30
threadedly supported in the bearing 28.
Adapted to connect the upper support plate 12 and the
stylus held in the apex of the “Gothic Arch” and ad 40
lower support plate 16 is a transverse bar 33 compris
justed to proper elevation, the models are secured to an
ing a pair of telescoping members 34 and 35. Although
articulator by means of plaster of Paris. In this crude
member 34 is disclosed as having a channel-shaped cross
manner, the centric relation of the jaws and gums are ob
sectionand the telescoping member 35 is disclosed as an
tained preliminary to the making of a set of false teeth
for the patient. The term “centric relation” refers to 45 angle or L-shaped member, the members 34 and 35 may
have ‘any convenient cross section provided they are
the natural relationship of an upper jaw and a lower jaw
‘adapted to slide longitudinally of each other. The in
of a patient when the jaws are normally closed. By na
side tclescoping member 34 is provided with a cylindrical
ture, the centric relation of any person’s jaws is not sym~
extension or hinge pin 36 having a threaded end adapted
metrical, nor is it identical to the centric relation of any
50 to extend through the ?ange 20 in sliding and pivotal en
other person’s jaws.
gagement with the slot 22. The threaded extension 36 is
It is therefore an object of this invention to provide a
secured in place by the nut 37. In a like manner a thread
pair of support plates for plastic dental base plates,
ed cylindrical extension or hinge pin 38 is ?xed to the op
which support plates may be universally adjusted with
posite end of the outside telescoping member 35 and
respect to each other, while in the patient’s mouth, and
locked in the adjusted position of the plates in. order to 55 adapted to extend through the flange 21 in sliding and piv
otal engagement with the slot 23. The threaded exten
obtain the true centric relation of the patient’s jaws.
sion 38 is secured in place by means of the nut 39._ It is
Another object of this invention is to provide a pair
to be understood that the means of pivotally and slidingly
of ?at plates for supporting plastic dental base plates con
connecting the telescoping members 34 and 35 to the re
taining impressions of the upper and lower gums, and
means for giving the support plates relative three-dimen 60 spective ?anges 20 ‘and 21 is not necessarily limited to the
details of construction of the extensions and nuts 36-39.
sional translatory movement and pivotal movement about
Each of the telescoping members 34 and 35 have regis
lateral and longitudinal axes.
tering longitudinal slots 40 and 41, respectively. Al
Another object of this invention is to provide a pair of
though FIGS. 1, 6, 7, and 8 disclose the telescoping mem
support plates for plastic dental base plates, the support
plates being easily connected and disconnected to each 65 bers 34 and 35 in fully extended position, the member
34 may be telescoped within the member 35 to withdraw
other and provided with means for locking the plates in
the extensions 36 and 38 from their respective slots 22
substantially any universally adjusted position.
and 23, after the nuts 37 and 39 have been removed.
Further objects and advantages of this invention will
In order to telescope the members 34 and 35, a rotary
be apparent from the following description, taken in
70 gear 45 extends transversely through the slots 40 and 41
conjunction with the drawings, wherein:
and is adapted to engage an upper rack 46 formed in the
FIG. 1 is a front elevational view of the invention,
slot 41 of the member 35, and formed to the right of the
with. the plates pivoted to open position;
gear 45, when the transverse bar 33 is in extended posi
tion, as disclosed in FIGS. _6 and 7. Likewise, a lower
rack 47 is formed in the slot 40 in the inner telescoping
member 34 to the left of the gear 45 when the transverse
bar 33 is in extended position. The gear 45 is provided
with ?anges 4S and 45 at opposite ends to hold the gear
45 within the respective slots 49 and 41 and is provided
with a slotted head 59 to permit rotation of the gear 4-5
resting on the wax layer 65 is adjusted to elevate the
upper plate 12 so that the mouth, jaws and lips are in
proper vertical relation.
The nuts 71 are loosened and
the guide plate 67 is moved forward to the dashed line
position of FIG. 5 so that it will not interfere with the
movement of the stylus 24. The patient is then requested
to chew so that the stylus 24 will form the “Gothic Arch”
66 in the wax layer 65. When the patient has stopped
by insertion of a screwdriver. Thus, by rotating the
chewing, the stylus 24 is located in the apex of the “Gothic
slotted head 50 and gear 45 in a counterclockwise direc 10 Arch” 66 and the guide plate 67 is moved toward the rear
tion, as disclosed in FIG. 7, the members 34 and 35 will
until the apex of the V-shaped notch 68 abuts the stylus
be telescoped to withdraw the extensions 36 and 33 from
24, and the nuts 71 are tightened to lock the guide plate
their respective slots 22 and 23 in order to disconnect the
67 and the stylus 24 in place, as disclosed in FIG. 5.
transverse bar 33 from the upper support plate 12.
With the stylus 24 locked in position, the nuts 37, 39,
A pair of upstanding cars 53 and 54 are formed along
60 and 62 are tightened to lock the metal plates 12 and
the rear edge and near the opposite sides of the lower
16 in their ?xed adjusted relative position. The entire
support plate 16. A link 55 is pivoted at its lower end
assembly is then removed from the mouth of the patient,
to the ear 53 by means of a pin 56. In like manner,
the models 11 and 15 reinserted into the cavities of the
another link 57 is pivoted at its lower end to the ear 54
by means of a pin 58. A threaded bolt 59 extends
through the upper end of the link 5'5 and the registering
slots 49 and 41 and is threadedly secured on the rear sur
face of the bar 33 by means of a nut 68. A similar
threaded bolt 61 extends through the upper end of the link
57 and the registering slots 40 and 41 and is threadedly
secured on the rear surface of the transverse bar 33 by
means of a nut 62. Both bolts 59 and 61 are adapted to
permit the upper ends of the links 55 and 57 to inde
pendently slide longitudinally or pivot within the register
ing slots 40 and 41 in the transverse bar 33.
Located on the upper surface of the lower support
plate 16 and adapted to register with the lower end of the
stylus 24 is a layer of wax 65. When the plates 12 and
16 are closed, as disclosed in FIG. 3, and the device is
inserted into a patient’s mouth, the movement of the jaws
will cause the stylus 24 to form a “Gothic Arch” 66 in
the wax 65. In order to lock thestylus 24- at the apex of
the “Gothic Arch” 66, a longitudinally slidable guide plate
67 having a V-shaped notch 68 at the rear end thereof
is mounted on top of the lower support plate 16. In
order to effect the longitudinal sliding movement, the
guide plate 67 has a longitudinal slot 69 adapted to slid
.ably reecive pins 70 ?xed in the lower plate 16 and hav
ing upper threaded ends to receive locking nuts 71. Thus,
[the guide plate 67 may be longitudinally adjusted to lock 45
and unlock the stylus 24 at the apex of the “Gothic
base plates 10 and 14, and the models 11 and 15 are at
tached to a conventional articulator 75 by means of plaster
of Paris 76 and 77. By this means the jaws and gums '
of the patient are properly simulated in true centric rela
tion, and by removing the entire plate assembly and the
base plates 10 and 14, the arti?cial teeth may be made
on the gum models 11 and 15 for the patient in true cen
tric relation.
As will be observed in FIG. 1, all the adjustments for
the metal plate assembly, the gear head 50, the bolt heads
59 .and 61, the stylus knob 29, the locking set screw 30,
and the nuts 71, are available from the front of the de
vice. Consequently, the support plates 12 and 16 may be
introduced into or withdrawn separately from the patient’s
mouth, and the plates 12 and 16 may be connected or
disconnected and locked in place or unlocked While in the
patient’s mouth. Whether or not the paltes 12 and 16
are locked in place within the patient’s mouth and then
withdrawn as a unit or withdrawn separately and then
reassembled, they will be attached to the articulator with
the same degree of accuracy, which is greater than that of
any conventional mechanisms now employed for obtain
ing the centric relation of the jaws.
To withdraw the plates 12 and 16 separately after the
patient has ?nished chewing, the head 50 is turned until
the extensions 36 and 38 are withdrawn from their respec
tive ?ange slots 22 and 23 and the ends of the telescoping
members 34 and 35 opposite their respective extension
Arch” 66, as best disclosed in FIG. 5, by engaging the
ends abut against the depending ?anges 21 and 20, respec
V-sh'aped notch 68 against the stylus 24.
tively. The nuts 37 and 39 may be removed entirely be
The operation of the invention is as follows:
fore the plates are inserted in the mouth or the nuts may
After the models of the gums 11 and 15 have been 50 be loosened before the plates are inserted and removed
poured and set and the impressions removed, wax or
after the patient has ?nished chewing. The bolt heads
‘other plastic material is heated and pressed over the
59 and 61 are then tightened to lock the bar 33 and sup
.gum surfaces of the models 11 and 15 to form the plastic
pont plate 16 rigidly in spaced relation. By sliding the
base plates 10 and 14. With the upper and lower support
?anges 20 and 21 over the abutting ends of the telescoping
vplates 12 and 16 assembled, the transverse bar 33 ex
members 35 and 34, respectively, the upper support plate
panded, the threaded extensions 36 and 38 registering
12 may be separately removed from the patient’s mouth,
with their respective slots 22 and 23 and the nuts 37 and
and subsequently the locked bar 33 and lower plate ‘16
39 securing the extensions in place, the warm, soft plastic
may be removed. To reassemble the device, the ends of
base plates 10 and 14 are placed on their respective metal
the telescoping members 34 and 35 are slipped into abut
support plates 12 and 16 and permitted to solidify in the
ting relation with their respective ?anges 21 and 20 until
holes 13 and 17. Although the nuts 37 and 38 are
the stylus 24 again registers with the apex of the “Gothic
threaded over their respective extensions 36 and 38, they
Arch” 66.
are sufficiently loose to permit the extensions to slide lon
It will the noted that the upper and lower support plates
gitudinally within their respective slots 22 and 23 and
12 and 16 may be adjusted in three dimensional transla
also to permit the upper plate 12 to pivot about the ex
tory relative positions as well as in relative pivotal posi
tensions 36 and 38. Moreover, the nuts 60 and 62 are
tions about a pair of horizontal axes normal to each
also loosened to permit the sliding and pivotal movement
of the bolts 59 and 61, respectively, within the register
other. Thus, the entire assembly permits practically any
ing slots 40 and 41. In this loosened condition, the
type of universal adjustment between the upper plate '12
models 11 and 15 are removed from their respective base 70 and the lower plate v16 in ‘order to obtain the true centric
plates 10 and 14, and the entire metal plate assembly with
relation of the patient’s jaws.
the base plates 10 and 14 are placed within the patient’s
It will be apparent to those skilled in the art that
mouth so that the patient’s gums will ?t within the cavi
changes may be made in the invention, without de
ties of the base plates 10 and 14. By loosening the set
parting from the ‘spirit ‘and scope thereof, and therefore
screw 30 and turning the disc or knob 29, the stylus 24
the invention is not- limited by that which is shown in the
drawings and described in the speci?cation, but only as
indicated in the appended claims.
What is claimed is:
1. An adjustable dental device for obtaining the centric
relation of the jaws comprising an upper plate for receiv
ing an impression of the upper gum and a lower plate for
receiving an impression of the lower gum, each of said
plates having a longitudinal axis and a transverse axis,
a transverse bar comprising a pair of members having
means for expanding and contracting said transverse mem
bers comprises a ?rst rack along one edge of one of said
first slots and a second rack along the opposite edge of said
other ?rst slot, a rotary gear engaging said ?rst and second
racks, and means for rotating said gear in said racks for
telescoping said members.
3. The invention according to claim 2 in which a stylus
is mounted for axial movement normal to said upper plate,
means for axially moving said stylus and means for look
registering ?rst elongated slots and adapted to telescope 10 ing said stylus in any axial adjusted position.
4. The invention according to claim 3 in which spaced
transversely of said lower plate, each of said, members
teeth are formed axially of said stylus and said means
having a transverse hinge pin extending from one end
for moving said stylus comprises a rotary gear engaging
thereof and on the opposite end from said other member,
said teeth.
a ?ange depending from each side of said upper plate and
having a second slot extending longitudinally of said 15 5. The invention according to claim 3 in which a guide
plate is mounted on said lower plate for slidable longi
upper plate, said second slots being in transverse align
tudinal movement thereon, the longitudinal axes of said
ment, said hinge pins being adapted to extend through said
opposite second slots in pivotal and longitudinally slid
able engagement therewith, means for contracting and
expanding said telescoping members relative to each other 20
to respectively disengage and engage said hinge pins with
their respective second slots, a pair of links having their
lower ends pivoted about axes longitudinally of said lower
plate, a pivot pin at the upper end of each link independ
ently slidably and pivotally engaging the registering ?rst 25
slots of said telescoping members, means for locking said
pivot pins in said ?rst slots and means for locking said
hinge pins in their respective second slots.
2. The invention according to claim 1 in which the
guide plate and said stylus being substantially coplanar.
References Qited in the ?le of this patent
Stocks ______________ __ Dec. 23,
Meadows ____________ _._ June 25,
Christopher __________ __ Feb. 10,
Meadows ____________ __ June 4,
Green ______________ __ May 21,
Brant ______________ __ Nov. 18,
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