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Патент USA US2301358

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Nov. 10_,_ 1942.
’
c. s. BALLARD
‘
2,301,358 ;
INTRA'ORAL DENTURE CORRELATOR
Filed Sept. 20. 1939
2 ' Sheets-Sheet 1
>
'
INVENTOR.
CA (yr/as‘ .5. ,6’ //am’
‘
Nov. 10, 1942. _
INTRA‘ . ORAL
c. s.DENTURE;
BALLiARD
v CORRELATOR
Filed Sept‘. 2o.._, 193s
-2 Sheets-Sheet 2 ' _,
4/010’
2,301,358
Patented Nov. 10, 1942
umren s'rres er
NT orrics
2,301,358
liNTRA-ORAL DENTURE CORRELATOR
Charles S. Ballard, Seattle, Wash.
Application September 20, 1939, Serial No. 295,783
6 Claims.
(01. 32-19)
Fig. 5 is a vertical section on the longitudinal
median line of Fig. 4 and modi?ed therefrom in
This invention relates to dental equipment and
especially to an intra-oral device for advancing
the practice of dentistry, in the production and
that the dentures are shown in separated relation
to one another for the insertion therebetween of
carbon paper from which, through the markings
transferred to irregular or high cusps, milling
may be carried on to effect true correlation.
?tting of arti?cial dentures, and for its general
object aims to provide equipment of this nature
functioning in its application to denture plates to
obtain a smooth and harmonious relation in all
Figs. 6, 7 and 8 are perspective views detailing
parts of the present invention shown in the pre
ceding views, namely the mounting base and the
working conditions of a patient’s lower in relation
to the upper jaw, whether the artificial teeth be
produced in the form of full dentures in opposi
tion, a full denture against a partial, or a full
denture against natural teeth. The technique
practiced is essentially one of correlating in
bearing and scratch plates thereof.
which the instant device serves the end of stabiliz
the mounting base and the bearing plate being
shown fragmentarily; and
ing the dentures which are inserted within the
mouth relative to the patient’s jaw processes, and
it is by this.term—correlator—~that I will herein
after refer to the instrument of my invention
Fig. 10 is an elevational View of the correlator
pin.
.
' The invention, in its preferred form, provides
a mounting base H of an approximate'horseshoe
insofar as the same is used to perform the said
stabilizing o?ice.
plan con?guration scarped to produce a marginal
flange l2 along both sides and about the curved
end and with the underside arched, this base piece
being somewhat smaller in its perimetrical com
With the foregoing and further more particular
objects and advantages in view, the nature of
which will appear in the course of the following
description and claims, the invention consists in
the novel construction and in the adaptation and
combination of parts hereinafter described and
claimed.
‘
Fig. 9 is a vertical section to an enlarged scale‘
detailing the several parts of the invention as
the same are assembled for correlating purposes,
‘ 'pass than the inner-edge limits of a lower bite
its preferred embodiment has been produced in
plate or denture, as the case may be, to which
the same is adapted to be applied. Such applica
tion, in the case of the bite plate represented
in Figs. 1 through 3 and denoted by‘ the letter a,
a manner which, in addition to its operation as
is accomplished by heating the base piece and
a correlator, permits what is known in dentistry
as “gothic arch tracing.” While I illustrate the
manner of the device’s application for, and here;
inafter describe the use in, gothic arch tracing,
no claim is made therefor in that the salient fea (a. Q1
ture of an expansive agent operative to yieldingly
in?uence, by intra-oral application, a full denture
directively from an opposing full denture, or from
an opposing partial denture, or from opposing
natural teeth, and which is responsible for the 40
pressing the warm ?ange into the wax of which
the bite plate is composed, the application to a
lower arti?cial denture, denoted by J‘ in Figs. 4
and 5, being accomplished by the use of a plastic
accomplishment of my correlating end, is entirely
inoperative in the employment of the instrument
for gothic arch tracing.
In the drawings:
Complementary to the mounting base and
adapted to be ?xed by plastic compound p’ to the
. It may be here stated that my instrument in
compound p. The position occupied by the base
piece in both of such applications is such that the
facing surface lies flush with or slightly above the
occlusal surface, the arched underside providing
ample tongue room to relieve any strained feeling
of such organ.
upper bite plate or the upper arti?cial denture,
as the case may be, in proximate but spaced
Figure 1 is a view in side elevation represent 45 parallel relation to the base piece is a plane bear
ing plate l3 generally conforming in its mar
ing the invention as the same is applied in the
ginal compass-to that of the base. This bearing
performance of gothic arch tracing.
Fig. 2 is a vertical section on the longitudinal
median line thereof.
‘
_
plate, as applied to a bite plate, is or may be sur
faced with a replaceable thin scratch plate M on
Fig. 3 is a transverse vertical posterior cross 50 which gothic arch tracing is recorded, the scratch
plate which is terminally hooked as at £4’ being
section on line 3—3 of Fig. 1.
‘
?xed in position by wax w.
Fig. 4 is a transverse vertical posterior cross
section indicating the application of the inven
tion, for correlating purposes, to upper and lower
arti?cial dentures.
.
"
i p
Reverting to the mounting base, in the approxi
imate center thereof, considered both transverse
ly and longitudinally, the same is tapped to form
2
2,301,358
a threaded socket [5 for the reception of a verti
cally adjustable and reversible hollow screw l6
serving as a bearing for a correlator pin I‘! which,
at one end I1’, is pointed and, at the other end
I1”,_is characterized by a rounded head. Im
mediately adjacent said ends are annular grooves
and lodged therein are rings [8 and [9. Ring l8
by abutment with the end wall of the screw limits
the axial travel of the pin under the in?uence of
contact of the dentures upon the underlying tis
sues irrespective of the rise and fall as contact
is had between cusp-and-cusp, and cusp-and
sulci.
It will be readily realized that a shifting move~
ment of the patient’s jaws permits the dentist,
through the instrumentality of placing carbon
paper between the teeth, to accurately ascertain
the “high spots” by the resulting transfer of
a compression spring 20 seating within a counter 10 markings from the paper to the teeth, and that,
bore I6’ of the screw and bearing against a collar
by milling oif these high spots, the dentist is per
2| abutting the other ring 19.
mitted to accurately relate the teeth of the den
In performing gothic arch tracing, the tech
tures to the patient’s true chewing processes.
nique of which is well known, the lower bite
It is to be understood, and it is believed to be
plate a and its complementing upper plate b have
apparent, that numerous modi?cations are with
their bite rims built only in the anterior region,
in the spirit of the invention and it is therefore
terminating at each side in the lateral incisor
my intention that the hereto annexed claims be
regions. The invention is applied in the manner
given a scope in their interpretation commen
shown in Figs. 1 through 3, which is to say with
surate with the state of the advance in the art of
the pointed end of the correlator pin uppermost,
dentistry, which said advance, as a generic state—
following which the screw is turned to bring the
ment, can be said to consist broadly of an intra
point ll’ into engagement with the scratch plate
oral spreader arranged to be applied between full
I4. So employed, the spring 20 is inoperative
dentures in opposition, a full denture against a
other than to bring the ring l8 into ?rm seating
partial, or a full denture against natural teeth
engagement with the screw. The patient is in 25 and having two functional characteristics-?rst,
structed to hold “centric” and the dentist in
an ability to freely contract and expand in corre
troduces to the upper and lower bite plates what
spondence with the rise and fall of the denture
may be referred to as centric aligners, consisting
plates and, second, an ability to accommodate it
of two square pieces of thin sheet metal, these
self to unrestrained oscillatory movement as be
aligners which I indicate by dotted lines in Fig. 2 30 tween the denture-carrying jaws. I consider it
and denote by in being warmed and pressed into
self-evident that the use of the terms “upper den
the wax of the bite plates to line up anteriorly
tures” and “lower dentures” in the several claims
and laterally. Upon completing the tracing steps
which are recorded on the scratch plate I4
through movement of the patient’s jaws through '
are to be liberally construed as meaning any ap
plicable member or members on which my cor
relating procedure may be performed.
anterior and lateral travel, these tracings being
What I claim is:
visible to the dentist through a retraction of the
1. In an intra-oral dental device: the com
patient’s cheek with a mouth mirror, the two
bination of a base piece adapted to be ?xed to
bite plates with the centric aligners even are
the lingual surface of a lower denture; a bearing
?xed in relation to one another by application of 40 plate providing a substantially plane facing sur
plaster c which is inserted from opposite sides of
face and adapted to be ?xed in the palate of an
the mouth by a spatula. The bite plates, then
upper denture to have said facing surface occupy,
removed with my intra-oral device intact, are
within the mouth of the patient, a plane proxi
readily mounted on an articulator by which the
mate to but spaced above the plane occupied by
determined bite characteristics of the patient
the base piece and approximately parallel with
are incorporated in arti?cial dentures.
the crest of said upper denture’s ridge; a bearing
In correlating these arti?cial dentures the in
member having a thread mounting in the base
vention is applied in the manner indicated in
piece permitting the same to be adjusted toward
Figs. 4 and 5, which is to say with the rounded
and from the bearing plate; a pin slidably jour
end ll" of the correlator pin uppermost, the
naled in said threadably mounted bearing mem
screw being adjusted to obtain the desired tension
ber for movement approximately at right angles
of the spring whose of?ce is to yieldingly spread
to the crest of the lower denture’s ridge or, other
the upper denture g from the lower denture ,f and
wise stated, at approximate right angles to the
thereby hold the same ?rmly against the underly
patient’s occlusal plane; and a spring ?nding a
ing tissues of the patient’s jaws.
It will, it is thought, be clearly understood that
in the performance of correlating work the den
footing against the threadably mounted bearing
member and acting on the pin to urge the latter
upwardly from the bearing member into contact
tures are caused to rise and fall as the cusps
with said facing surface of the bearing plate to
of one denture pass over the cusps of the other
yieldingly in?uence the two dentures, one from
denture and ride along the inclined surfaces into 60 the other, and thereby seat the dentures ?rmly in
the so-called valleys, or sulci, between the teeth,
the mouth, said adjustment of the bearing mem
and my spring agent serves the obvious o?ice of
ber toward and from the bearing plate operating
maintaining a ?rm seating engagement of the
in the respective instance to increase and de
dentures against the underlying tissues of the
crease the spring pressure and thereby increase
patient’s upper and lower jaws throughout the
and decrease the compression of the tissues of
correlating procedure, which is to say while the
the patient’s mouth which lie under the dentures,
one denture rises and falls in relation to the other
said pin being formed to have its contacting tip
denture by oscillatory movement given to the
track freely over said facing surface of the bear
seated dentures by shifting of the patient’s jaws.
ing plate for permitting uninterrupted oscillatory
Otherwise stated, the device—-as a correlator--is 70 motion of the lower in relation to the upper of
an instrument which stabilizes the dentures per
the patient’s two dentures.
mitting the latter to move in unison with, the
2. In an intra-oral dental device: the com
patient’s jaws, the spring agent pressing out
bination of a base piece adapted to be ?xed to the
wardly in opposition to the closing movement of‘
lingual surface of a lower denture; a bearing
the jaws to maintain a continuing ?rm seating 75 plate providing a substantially plane facing sur
2,301,358
face and adapted to be ?xed in the palate of an
upper denture to have said facing surface occupy,
within the mouth of the patient, a plane proxi
mate to but spaced above the plane occupied by
the base piece and approximately parallel with
the crest of said upper denture’s ridge; a pin
carried by the base piece for sliding movement
approximately at right angles to the crest of the
lower denture’s ridge or, otherwise stated, at ap
3
spaced from the plane occupied by the other ele
ment and approximately parallel with the crest
of its related denture’s ridge; and an expanding
member carried by the other of said ?xed ele
ments and spring-actuated directively from its
supporting element into contacting engagement
with the plane facing surface of said comple
menting element, thereby to yieldingly in?uence
the two dentures, one from the other, and seat
proximate right angles to the patient’s occlusal 10 the dentures ?rmly in the mouth, said expanding
member being formed to have its contacting tip,
plane; and a, spring acting on said pin to urge
which is to say the part thereof which engages
the latter upwardly into contact with said facing
said plane facing surface, track freely over said
surface of the bearing plate to yieldingly in?uence
facing surface for permitting uninterrupted oscil
the two dentures, one from the other, and thereby
seat the dentures ?rmly in the mouth, said pin 15 latory motion as between the patient’s two
dentures.
being formed to have its contacting tip track free
5. A dental device according to claim \4 having
ly over said facing surface of the bearing plate
adjustment means for increasing and decreasing
for permitting uninterrupted oscillatory motion
the effective expansion pressure of the spring
of the lower in relation to the upper of the
20 which acts on the expanding member, thereby
patient’s two dentures.
to increase and decrease the compression of the
3. In an intra-oral dental device: the com
tissues of the patient’s mouth which lie under
bination of a base piece adapted to be ?xed to
the lingual surface of a lower denture; a bearing
the dentures.
6». In an intra-oral dental device, in combina
plate providing a substantially plane facing sur
face and adapted to be ?xed in the palate of an 25 tion: a member adapted to be ?xed to one of a
set of upper and lower dentures to lie within the
upper denture to have said facing surface occupy,
dental arch thereof; an expander-element car
within the mouth of the patient, a plane proxi
ried by said ?xed member and spring-urged out
mate to but spaced above the plane occupied by
wardly from the supporting denture in a direc
the base piece and approximately parallel with
tion approximately at right angles to the plane
the crest of said upper denture’s ridge; and a
occupied by the ridge of the latter; and a member
spring-actuated expander carried by said base
complementary to said ?rst-named member
piece and urged by the spring upwardly from the
adapted to be ?xed to the other denture to lie
base piece into contact with said facing surface
within the dental arch of the latter and provid
of the bearing plate for yieldingly in?uencing the
two dentures, one from the other, and thereby 35 ing an element arranged, in the application of the
dental device within the mouth of the patient, to
seating the dentures ?rmly in the mouth, said
?nd footing engagement with and receive the
expander being characterized in that its contact
expansive thrust of said expander-element for
ing tip, which is to say the part thereof which
yieldingly influencing the two dentures, one from
contacts the facing surface of the bearing plate,
the other, and thereby seating said dentures
is formed to allow a free tracking movement over
?rmly in the mouth, said expander and footing
said facing surface to permit uninterrupted oscil
elements being unattached and being character
latory motion of the lower in relation to the upper
ized
in that one of such elements provides a rela
of the patient’s two dentures.
tively ?at bearing face disposed to lie approxi
4. In an intra-oral dental device: the com
mately parallel with the crest of its related den
bination of a pair of complementary elements of
ture’s ridge and the other of such elements a
which one is adapted to be ?xed to the lingual
working extremity arranged to bear upon and
surface of a lower denture and the other ?xed in
track freely over such bearing face to permit
the palate of an upper denture and with one of
uninterrupted oscillatory movement of the one as
said elements providing a substantially plane
facing surface which, in the application of the 50 respects the other of the two dentures.
dental device within the mouth of the patient, is
CHARLES S. BALLARD.
arranged to occupy a plane proximate to but
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