U.S. patent number 3,747,216 [Application Number 05/203,975] was granted by the patent office on 1973-07-24 for andodontic instrument for concurrent programmed boring, spraying and cleansing of dental root channels.
Invention is credited to Ezio Bassi, Francesco Riitano.
United States Patent |
3,747,216 |
Bassi , et al. |
July 24, 1973 |
ANDODONTIC INSTRUMENT FOR CONCURRENT PROGRAMMED BORING, SPRAYING
AND CLEANSING OF DENTAL ROOT CHANNELS
Abstract
An endodontic instrument combining boring, spraying and
cleansing means for concurrent operations in root channels by a
programmed treatment, said instrument including novel
electro-mechanical means for imparting to the boring tool a
composite reciprocating rotational motion on an arc of a chord of
about 90.degree. and a uniform continuous rotary motion, the
continuous rotary motion being converted to rectilinear
translational motion. A suction chamber is part of the instrument
and sucks off the solutions used in treatment.
Inventors: |
Bassi; Ezio (Imola,
IT), Riitano; Francesco (Soverato, IT) |
Family
ID: |
11110927 |
Appl.
No.: |
05/203,975 |
Filed: |
December 2, 1971 |
Foreign Application Priority Data
|
|
|
|
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Dec 5, 1970 [IT] |
|
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3633 A/70 |
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Current U.S.
Class: |
433/81; 433/91;
433/118 |
Current CPC
Class: |
A61C
17/0208 (20130101); A61C 1/185 (20130101); A61C
1/07 (20130101) |
Current International
Class: |
A61C
17/00 (20060101); A61C 17/02 (20060101); A61C
1/08 (20060101); A61C 1/00 (20060101); A61C
1/07 (20060101); A61C 1/18 (20060101); A61c
005/02 () |
Field of
Search: |
;32/57,58,27,26,4R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Peshock; Robert
Claims
What is claimed is:
1. An endodontic instrument for concurrent operations in boring,
spraying and cleansing of dental root channels, comprising in
combination:
a frusto-conical tool head including means for sealing said head to
the top of the tooth whose root channels are to be treated;
electromagnetic means within said tool head including converting
means and a boring tool in a bushing in the head, said
electromagnetic means imparting a composite motion of a rotational
motion and a reciprocating motion through an arc on a chord of
about 90.degree. and a uniform rotary motion to said boring tool,
while said converting means translates said uniform rotary motion
into a uniform rectilinear motion in a direction parallel to the
axis of rotation of the rotational reciprocating motion of said
boring tool;
at least two conduits for delivering different treating solutions
to the proximity of the boring tool for radicular channel
spraying;
and at least one suction or vacuum chamber whose inlet is
positioned in and along the frustro-conical surfaces, of said
head.
2. An endodontic instrument as claimed in claim 1, wherein said
converting means for converting said uniform continuous rotary
motion to a uniform rectilinear translational motion leaves the
rotational reciprocating motion unaltered and includes kinematic
connecting means for transmitting said composite motion from the
electromechanical means to said converting means.
3. An endodontic instrument as claimed in claim 2, including a
revolution counter for counting the number of revolutions per
minute of the uniform rotary motion which is proportional to the
uniform rectilinear movement of said boring tool.
4. An endodontic instrument as claimed in claim 2, including a
suction chamber connected to the remaining instrument body by
resilient connecting means.
5. An endodontic instrument as claimed in claim 2, wherein said
electromechanical means comprises;
a gear reducing unit having a shaft;
a first disc having a hub which is keyed on said shaft;
two electromagnets positioned on said disc to provide opposed pole
pieces;
a rocker rod pivoted on said disc inserted between said pole pieces
for engaging a second disc;
a second disc carried on the hub of the first disc for freely idly
rotating on said first disc hub;
and said kinematic connecting means for driving said converting
means being fastened securely to said second disc.
Description
This invention relates to an endodontic instrument for carrying out
the programmed endodontic treatment steps of boring, spraying and
cleansing of dental channels.
As is well known, the endodontic treatment contemplates the
following steps:
A. appropriate dressing of the access cavity to the root-pulp
channel with removal of pulp in the cavity;
B. location of the opening of the radicular channels and measuring
the depth thereof by means of a radio-opaque probe with the aid of
X-ray photography;
C. removal of radicular contents and organic waste by means of
suitable instruments such as nerve pullers, files and
channel-spreaders with spreading of the channels (boring with
endodentine removal) to the apex, with cleansing by spraying with
suitable chemical solutions, such as sodium hypochlorite and
Perihydrol, e.g., a solution of hydrogen peroxide (oxygenated
water) at 30 percent, to remove the waste material;
D. final washing step carried out with antibiotic and enzymatic
antiseptic solutions;
E. channel drying and tridimensional filling thereof, preferably to
the apex and including the secondary canaliculi.
The instrument according to the present invention is designed and
constructed to particularly meet the requirements of steps b, c,
and d above, commonly referred to as the chemical-mechanical
channel dressing.
A critical factor or principle governing these steps lies in the
depth-adjustment of the boring, spraying and continuous suction
cleansing operations in the presence of lubricants. The reamer or
boring means operates better when lubricated and spraying is more
effective if hydraulic thrust readily removes the whipped content
of the cleansing means. Further suction must readily remove the
debris outwardly of the cavity and the channel.
All of the means heretofore developed including the commercial
devices for separately carrying out the above operations of boring
(see, for examples U.S. Pat. Brenman et al. No. 3,073,031 and
Gythfeldt No. 1,682,784), spraying and sucking for cleansing are
either partly or totally unsuitable because of the long treatment
time required. Reamers and boring means are known but these do not
spray and do not suck away debris. The known spraying-sucking means
which do not bore are cumbersome. They partially wash the channel,
but they do not whip the endocanalar material and their sucking
action is not adequate to aboid damage to the endoral mucous
membranes because of insufficient collection of the cleansing
solutions.
It is the main object of the present invention to concurrently
carry out the programmed endodontic procedure for chemical and
mechanical channel dressing and at the same time provide for the
programmed boring, spraying and cleansing by suction.
A further object is to reduce the working time and at the same time
to increase boring effectiveness by lubrication.
These and other objects are attained by the instrument of the
present invention which provides simultaneous operations of
programmed boring, spraying and cleansing for dental radicular
channels, this instrument essentially comprising means for giving a
boring tool a composite motion of a rotational reciprocating
movement through an arc on a chord of about 90.degree. with a
uniform rectilinear translational movement, two or more conduits
for delivering different solutions to the proximity of the boring
tool for radicular channel spraying, and at least one suction or
vacuum chamber for sucking off the solutions and waste and thereby
preventing the waste from possibly contacting the oral mucous
membranes.
The instrument of the invention is further characterized in that
the means for imparting to the boring tool a composite rotational
reciprocating motion with a translational motion essentially
comprise: an electromechanical device capable of providing a
rotational reciprocating motion through an arc on a chord of about
90.degree. with a uniform continuous rotary motion; means for
converting the uniform continuous rotary motion to a uniform
rectilinear translational motion without altering the rotational
reciprocating motion; and kinematic connection means for
transferring the composite motion from the electromechanical device
to the motion converting means.
The features of the instrument according to the present invention
will now be more fully described and shown with reference to a
practical embodiment thereof, given as a non-limiting example, and
with the aid of the accompanying drawings, in which:
FIG. 1 is an enlarged, partly sectional, longitudinal view showing
the instrument as a whole;
FIG. 2 is a longitudinal sectional view on a substantially enlarged
scale relative to FIG. 1, showing the tool holder head in operating
position;
FIG. 3 is a partly sectional, front view of the tool holder head
shown in FIG. 2;
FIG. 4 is a partly sectional, longitudinal view of an
electromechanical device for producing a particular motion which is
transmitted to the instrument shown in the above figures; and
FIG. 5 is a front view rotated by 90.degree. for the device as
shown in FIG. 4.
Referring to the drawings, and particularly FIGS. 1 and 2,
reference numeral 1 indicates a handle for accomodating therein a
flexible steel cable 2 covered by a sheath 3. The flexible cable 2
is firmly connected to first shaft 4 which is carried through two
sleeves 5 by a tube-like element 6 which is threaded to an angle
connecting element 7 to connect the handle 1 with a tubular arm 8.
Within the tubular arm 8, a second shaft 9 is accomodated and is
carried through two sleeves 10 by a coaxial tube-like element 11
which is also threaded to the angle element 7.
This second shaft 9 is connected by kinematic means to the first
shaft 4 through a pair of gear wheels 12. A preferred tool holder
head 13 is fastened to arm 8 and has its longitudinal axis at right
angles to the axis of arm 8.
Referring to FIG. 2, the tool holder head essentially comprises an
outer shell 14, partly of a substantially cylindrical shape and
partly of a substantially frusto-conical shape. On the
frusto-conical portion there is a suitably shaped projection 15
which provides a suction or vacuum chamber and which tapers to an
opening 26, described below.
Within the cylindrical portion there is inserted a bushing 17, on
the outer surface of which a gear wheel 21 is keyed. Gear wheel 21
meshes with a gear wheel 22 which is keyed on the second shaft 9 of
the tubular arm 8. Inside the bushing 17, there is a hole 23 which
is segment-shaped in cross-section as shown in FIG. 3, into which
the stem 18 for a boring tool 19 is slipped. The tool stem 18 is of
a threaded segment cross-section. The threaded stem 18 is screwed
into a closing plug 20 for the head and the closing plug 20 is
screwed into said outer shell 14. Bushing 16 holds a boring tool 19
in the frusto-conical portion of the outer shell 14.
Three tubes 24 are firmly attached to the handle 1 for conveying
the spraying liquids through the opening 26 and a tube 25
communicates with the suction or vacuum chamber 15. The boring tool
19 also passes through the opening 26.
Reference numeral 29 (FIG. 3) indicates two slits located
substantially in the frusto-conical portion of the outer shell 14
for creating a vacuum in the suction or vacuum chamber.
Flexible cable 2 is compositely driven by a reciprocating
rotational motion on an arc of a chord through about 90.degree. and
by a uniform continuous rotary motion. This composite motion is
integrally transmitted to the bushing 17 and also to the boring
tool stem which, because it is screwed on the fixed plug 20, moves
axially forward, while retaining the reciprocating rotational
motion. To sum up, the reciprocating rotational motion on an arc of
a chord through about 90.degree. is unaltered on the boring tool,
whereas the continuous rotary motion is converted to rectilinear
translational motion.
The composite motion given to the flexible cable is provided by an
electromechanical device of the present invention which is shown in
FIGS. 4 and 5.
This electromechanical device comprises a gear reducing unit 30
having a shaft 31 on which a disc 32 is keyed. Two opposed
electromagnets 33 are rigidly secured on the disc 32, the pole
pieces of these electromagnets being effective to energize a rocker
rod 34 which is pivoted at 35, and, in FIG. 5, the rocker arm is
shown in closer position to the left electromagnet of the pair. The
rocker rod 34 engages a pin 36 which is keyed on a disc 37. The
disc 37 is carried by an idle shaft 38 which is freely rotatable
about the axis of disc 32. The flexible cable 2 is fastened to said
disc 37. On the fact of disc 32 opposite to that on which said
electromagnets 33 are arranged, three conductive rings 39 are
placed with the electric supply brushes sliding thereon.
A revolution counter 41 is operated by a pin 42 projecting from the
hub carrier of said disc 32.
On alternately energizing the electromagnets by electric pulses,
the rod 34 is caused to swing through an angle of about 90.degree.
and the disc 37 is also caused to rotate through about 90.degree..
Because it is pivoted on disc 32, the rocker rod 34 is caused to
rotate therewith and, as a result, provides the disc 37 with a
continuous rotary motion.
The r.p.m. as provided by the revolution counter is related to the
boring tool feed, thereby allowing for programming the boring
operation.
According to an alternate embodiment, the substantially
frusto-conical portion of the shell 14 may be separated from the
substantially cylindrical portion of the shell and may be connected
thereto by a resilient element enabling the position of the suction
or vacuum chamber relative to the tool holder head to be
changed.
Other modifications and changed may be made without departing from
the spirit and scope of the present invention.
* * * * *