JP4427682B2 - Intraoral recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intraoral recording apparatus used for recording the central relationship of jaws and jaw movements in dental clinics.
[0002]
[Prior art]
In recent dental clinics, there are many cases using dental prostheses made of cutting-edge materials such as implants and ceramics, and the necessity of accurately measuring and recording the movement of the jaw and the position where the jaw is stable is recognized. Has been. In addition, in order to maintain the health of the oral cavity where the dental prosthesis is attached for a long period of time, accurate measurement and recording of the jaw movement and the position where the jaw is stable are essential conditions for the production of the dental prosthesis. It has become.
[0003]
Typical examples of methods used for measuring and recording the jaw center relationship and mandibular movement include a check bite method, a pantograph method, and a chewing method. Among them, the check byte method using a drawing device is the most widely used measurement and recording method.
[0004]
The writing device used in this check bite method is a device in which a drawing pin is attached to the upper jaw and a flat drawing plate is attached to the lower jaw, and the lower jaw is guided horizontally and forward by laterally guiding the lower jaw. It is possible to draw a simple mandibular movement path. This mandibular movement path consists of three arrowhead-shaped lines with one apex, and this drawing is called a Gothic arch.
[0005]
Based on this gothic arch, the record of the central relationship of the jaw and the record of the mandibular movement are recorded on paraffin wax or the like by the check bite method. In order to accurately record the central relationship of the jaw and mandibular movement, it is necessary to describe this Gothic arch with high accuracy.
[0006]
In the intraoral recording device disclosed in Japanese Patent Publication No. 59-18053 (patent No. 1245692), accurate recording is performed not only for edentulous patients, but also for cases of local dentures and cases of edentulous patients. It is known as something that can be done and is widely used in dental practice.
[0007]
The intraoral recording device disclosed in this publication is composed of an upper jaw plate A shown in FIGS. 5 and 6, a lower jaw plate B shown in FIGS. 8 and 10, and a connecting device C shown in FIG. As shown in FIGS. 13 and 14, the gothic arch is drawn and a check bite is obtained by being installed in the oral cavity.
[0008]
The upper jaw plate A shown in FIG. 5 protrudes downward substantially at the center of the U-shaped upper jaw plate main body a, and has a guiding column stud 2 having a rotating ball 4 at the protruding end, and a rear end portion of the upper jaw plate main body a. Two auxiliary studs 3 and 3 provided symmetrically downward and a pin device f having a cylindrical holding portion 24 projecting downward from the front end e of the upper jaw plate main body a are provided.
[0009]
FIG. 6 shows a cross-section of FIG. 5IIA-IIA. According to FIG. 6, in order to guide the jaw movement and maintain the vertical jaw distance, the column stud 2 that can be freely adjusted in length and the stud fixing that fixes the guidance column stud 2 when the length is adjusted. A screw 8 is provided. Further, a drawing pin 1 for drawing a Gothic arch is detachably attached to the hollow cylindrical holding portion 24 of the pin device f, and a pin holding device h for fixing the drawing pin 1 is provided. Yes.
[0010]
FIG. 7 shows a main part of the pin device f. As shown in FIG. 7, the pin holding device h includes a pin stopper 5 that holds the drawing pin 1, a resilient material 6, and a resilient material set screw 7. Further, a pin spring 23 for holding downward pressure is attached to the outer periphery of the drawing pin 1.
[0011]
FIG. 8 is a front view showing the lower jaw plate B from the rear. As shown in FIG. 8, the lower jaw plate B includes a lower jaw plate body b and a recording floor connecting portion d. The lower jaw plate main body b includes a drawing table 9 for attaching a drawing board 9a provided at the distal end portion thereof, and a guidance table 10 provided in the central portion for attaching the guidance plate 10a, and is connected to a U-shaped recording floor. The part d is provided with two tables of motion path forming tables 11 and 11 for attaching motion path records 11a provided symmetrically at the rear end part. The lower jaw plate body b and the recording floor connecting portion d are detachably fixed by lower jaw plate body fixing screws 25, 25.
[0012]
FIG. 9 shows the drawing table 9 located in the forefront in the oral cavity. A drawing board 9 a is formed on the surface of the drawing table 9. The drawing board 9a is made of a plastic material such as an instant polymerization resin placed on the surface of the drawing table 9, and comes into contact with the needle at the tip of the drawing pin 1 attached to the upper jaw plate A to move the drawing pin 1. Is recorded as a Gothic arch.
[0013]
FIG. 10 shows a cross section of the lower jaw plate B. A guidance plate 10a made of a processable resin is attached to the guidance table 10. The guidance plate 10a is formed on a three-dimensional inclined surface corresponding to the guidance strut stud 2 attached to the upper jaw plate A, and records the patient's unique incision angle and is in contact with the guidance strut stud 2. It is a guide to glide and induces jaw movement to record the movement track record. This guidance board 10a is connected to the guidance table 10 by a guidance board fixing screw 26 as shown in FIG.
[0014]
Further, a motion path record 11a is formed by placing a plastic material such as putty-like silicon rubber on the motion path forming tables 11, 11. In this movement path record 11a, the auxiliary studs 3 and 3 of the maxillary plate A are plasticized by guiding the patient's jaw while sliding the instruction post stud 2 on the incisal road angle recorded on the instruction plate 10a. Recording is formed by three-dimensional engraving on a silicon rubber or the like.
[0015]
The connecting device C shown in FIG. 12 includes a connecting shaft 14, an upper jaw plate supporter 15, a lower jaw plate supporter 16, a plate interval fixing screw 17, and a connecting screw 13 that connects the lower jaw plate B. This connecting device C is used to connect the upper jaw plate A and the lower jaw plate B, and to perform mounting work for mounting the upper jaw plate A and the lower jaw plate B on the recording floors X and Y shown in FIGS. is there. The recording floors X and Y to which the upper jaw plate A and the lower jaw plate B are respectively attached are removed from the connecting device C and fixed in the oral cavity with an adhesive such as cement.
[0016]
[Problems to be solved by the invention]
However, in the conventional intraoral recording device, the pin device f includes the drawing plate forming pin 19, the writing pin 1, and the chin fixing pin 18 in the recording forming process of the drawing board 9 a, the Gothic arch drawing process, and the check biting process. Each of the structures to be attached and detached is complicated, and there is a problem that a failure such as breakage of the elastic member 6 occurs.
[0017]
The main body of the instruction post stud 2 is a male screw. The screw part of the instruction post stud 2 is turned, the distance between the vertical jaws is determined, and the stud fixing screw 8 is tightened to fix the instruction post stud 2 according to the screw structure. Although the length was adjusted, there was a problem that it was easy to loosen. Moreover, although the instruction | indication support | pillar stud 2 can be fixed by the stud fixing screw 8 to maintain the determined length, there is a drawback that the stud fixing screw 8 is easily loosened.
[0018]
In the process of connecting the instruction board 10a to the instruction board table 10 of the lower jaw plate B with the instruction board fixing screw 26, the instruction board 10a is fixed to the instruction table 10 by the instruction board fixing screw 26, and can be attached and detached for adjustment. However, there was a risk of medical accidents such as small screws and dropping screws and adjusting devices into the oral cavity.
[0019]
The drawing board 9a is produced using a resin with the drawing board forming pin 19 in the recording forming process of the drawing board 9a, but the production operability is poor and complicated. Further, in the connecting step for adjusting the start position with a constant horizontal position, the upper jaw plate A and the lower jaw plate B are connected using the connecting device C. In this connection, the connecting shaft 14 and the upper jaw plate supporter are connected. 15. Since it is necessary to use the lower jaw plate supporter 16, the plate interval fixing screw 17, and the connecting screw 13, the operability is poor and complicated.
[0020]
The present invention has been made in view of these problems, made the upper jaw plate, the lower jaw plate and connection device for connecting the said upper jaw plate are located in central maxillary plate body in which the U-shaped A connecting hole that opens downward to connect the guide strut stud that forms a trajectory on the teaching drawing board, a stud mounting hole that opens downward to connect the connecting device, and a central portion of the upper jaw plate body A drawing opened downward to attach any one of the drawing pin, the drawing plate forming pin, and the chin fixing pin, which forms a locus on the teaching drawing board located at the tip of the front end portion extending forward. includes a pin mounting hole, located in the rear end portion of the U-shaped upper plate body, symmetrically respectively so as to project downward and the auxiliary stud forming the two movement paths,
[0021]
The lower jaw plate, positioned at the center of the lower jaw plate body in which the U-shaped, and connecting holes for connecting the teaching描記plate or connection device, located in the rear end portion of the U-shaped lower jaw plate body, symmetrical And an exercise path formation table provided respectively in
[0022]
The coupling device includes an upper jaw plate coupling portion having a stud for coupling to the upper jaw plate, a lower jaw plate coupling portion having a stud for coupling to the lower jaw plate, an upper jaw plate coupling portion, and a lower jaw plate coupling portion. With plate spacing fixing screws for connection,
[0023]
Each of the connecting hole, stud mounting hole, drawing pin mounting hole, and connecting hole, drawing pin, drawing plate forming pin , and jaw fixing pin provided in the upper jaw plate are formed of magnets. It is characterized by being.
[0024]
In the present invention, the drawing board forming pin 19, the drawing pin 1 and the jaw fixing pin 18 are each fixed to the drawing pin mounting hole 40 by magnets, so that they can be easily attached and detached and do not require complicated operations such as screw tightening.
[0025]
Moreover, since the instruction | indication support | pillar stud 2 is fixed with the magnet of the connection hole 27, attachment / detachment for adjustment of a jaw space | interval is easy, there is no complexity of operation, and clinical adjustment time is shortened.
[0026]
Conventionally, the instruction table 10 provided separately on the lower jaw plate B and the drawing board table 9 are combined to form the instruction drawing board 33, so that the attaching / detaching process can be performed once and the attachment to the lower jaw plate B can be performed by the connecting hole. Since it is fixed by the magnets 36a, 36b, and 36c, it can be easily attached and detached.
[0027]
For this reason, the position adjustment process and the record formation process of the guidance board 10a in clinical practice, and the attachment and detachment from the oral cavity can be quickly performed in the record formation process, gothic arch drawing process and check bite acquisition process of the writing board 9a.
[0028]
In addition, a metal drawing plate 34 is detachably attached to the drawing plate portion 33b in front of the instruction drawing plate 33, and it is possible to detect the energization between the drawing pin 1 and the metal drawing plate portion 34. Even when the small hole in the check bite collecting process cannot be confirmed due to being blocked by the light, it can be confirmed by a buzzer sound or the like by the electric detector 200 (see FIG. 15).
[0029]
Further, the upper jaw plate A and the lower jaw plate B are connected using the connecting device C, and the connecting process, adjusting process and disconnecting process for adjusting the start position with the vertical and horizontal positions fixed are attached and detached with a magnet. It can be done easily. Further, the connecting device C can be separated into the upper jaw plate connecting portion 29 and the lower jaw plate connecting portion 30 only by loosening the plate interval fixing screw 17, and the connection can be released in a short time.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the function form similar to a prior art, and the overlapping description is abbreviate | omitted.
[0031]
The intraoral recording apparatus according to the embodiment of the present invention shown in FIG. 1 has a three-dimensional shape that approximates the curvature of the palate, and further has a narrow U-shaped upper jaw plate A hollowed out from the center to the rear, The lower jaw plate B has a narrow U-shape cut out from the rear to the rear and a connecting device C for connecting them.
[0032]
By making the upper jaw plate A and the lower jaw plate B U-shaped, the upper jaw plate A can be attached in close contact with the palate, and the lower jaw plate B is also positioned above to prevent the tongue from being pressed. Further, the tongue of the patient can be stored in the hollowed portion of the lower jaw plate B, and the tongue is pressed by the lower jaw plate B, and the lower jaw plate B is prevented from being lifted by the tongue pressure during recording.
[0033]
As shown in FIG. 2 (a), the upper jaw plate A has a connecting hole 27 formed by a magnet opened downwardly for connecting the instruction strut stud 2 to the approximate center of the upper jaw plate main body a, and a connecting device. A stud attachment hole 28 formed of a magnet opened downward for connecting C and a downward opening for attaching the drawing pin 1 to the tip of the front end e extending forward of the upper jaw plate main body a. A recording pin mounting hole 40 formed of a magnet and auxiliary studs 3 and 3 for recording two movement paths projecting symmetrically downward at the rear end of the upper jaw plate body a. ing.
[0034]
2 (a) has a rotating ball 4 at its tip, and is fixed to the connecting hole 27 by a magnet so as to be detachable. The guiding plate 10a forming step, the motion path recording forming step, and the drawing plate In the forming step and the Gothic arch drawing step, the trajectory is formed in the plastic material by coming into contact with the instruction table portion 33a of the lower jaw plate B, and the jaw movement is induced by sliding on the instruction plate 10a.
[0035]
Similarly, the movement path formation auxiliary studs 3 and 3 have a rotating sphere 4 at the tip, and form a locus in the plastic material 9 in contact with the movement path formation tables 11 and 11 of the lower jaw plate B in the movement path recording formation process. Then, the motion path records 11a and 11a are recorded. Further, in the drawing board forming step and the Gothic arch drawing step, the jaw movement is induced by sliding on the movement path records 11a and 11a of the lower jaw plate B.
[0036]
The drawing pin 1 is inserted into a drawing pin mounting hole 40 formed of a magnet and fixed detachably. The mounting length of the drawing pin 1 can be easily achieved by sandwiching pin spacers 20 (see FIG. 3E) having different lengths therebetween.
[0037]
In the drawing pin mounting hole 40, the drawing plate forming pin 19 is attached in the recording forming process of the writing board 9a, the drawing pin 1 is attached in the Gothic arch drawing process, and the jaw fixing pin 18 is attached in the check biting process. Mounted. Thus, the pins used in each process can be easily attached and detached (not shown).
[0038]
The lower jaw plate B shown in FIG. 2 (c) has connecting holes 36a, 36b, 36c formed by magnets for connecting the instruction drawing board 33 or the connecting device C to the central portion of the U-shaped lower jaw plate main body b. And the lower jaw plate body b (7) are provided with motion path forming tables 11 and 11 symmetrically at the rear end of the U shape. In FIG. 2 (c), the instruction drawing board 33 is detachably attached to the upper portions of the connection holes 36a, 36b, 36c by a magnet.
[0039]
In the instruction drawing board 33, a rear instruction table section 33a and a front drawing board section 33b are integrated. The guidance table portion 33a is provided with the guidance plate 10a in the guidance plate 10a forming step, and is associated with the guidance column stud 2 of the upper jaw plate A. A drawing board 9a is placed on the drawing board portion 33b. The drawing board 9a corresponds to the drawing board forming pin 19 in the recording formation process of the drawing board 9a, corresponds to the drawing pin 1 in the Gothic arch drawing process, and in the check bit acquisition process. Each operation is performed in correspondence with the chin fixing pin 18.
[0040]
The movement path forming tables 11 and 11 are mounted with plastic materials such as putty-like silicone rubber, and correspond to and contact with the movement path forming auxiliary studs 3 and 3 of the upper jaw plate A in the movement path forming process. The movement path record 11a is produced by engraving.
[0041]
2B includes an upper jaw plate connecting portion 29 including studs 31a and 31b for connecting to the upper jaw plate A, and studs 32a, 32b and 32c for connecting to the lower jaw plate B. The lower jaw plate connecting portion 30 and the plate interval fixing screw 17 for connecting the upper jaw plate connecting portion 29 and the lower jaw plate connecting portion 30 to each other.
[0042]
The connecting device C connects the upper jaw plate A and the lower jaw plate B, and adjusts the upper jaw plate A and the recording floor X and the lower jaw plate B and the recording floor Y to the start position where the horizontal position is constant. It is used for positioning together with the adjustable articulator 100 in the connecting step and the adjusting connecting step for fixing with a binder such as an immediate polymerization resin after adjusting to an optimal position.
[0043]
After these steps, the upper jaw plate A and the lower jaw plate B can be separated into the upper jaw plate connecting portion 29 and the lower jaw plate connecting portion 30 by loosening the plate interval fixing screw 17 in the connection releasing step of disassembling the upper jaw plate A and the lower jaw plate B. The connection can be released in a short time.
[0044]
The connecting hole 27, the stud mounting hole 28 and the drawing pin mounting hole 40 provided in the upper jaw plate A, and part or all of the connecting holes 36a, 36b, 36c provided in the lower jaw plate B are formed by magnets. Therefore, each operation of the intraoral recording operation can be easily performed in a short time.
[0045]
Further, since the drawing board forming pin 19, the drawing pin 1 and the jaw fixing pin 18 are fixed to the drawing pin mounting hole 40 by magnets, they can be easily attached and detached and do not require complicated operations such as screw tightening.
[0046]
Since the guidance post stud 2 is fixed by the magnet of the connecting hole 27, it is easy to attach and detach for adjusting the jaw interval, there is no complicated operation, and clinical adjustment time is shortened.
[0047]
Furthermore, since the instruction board table 10 and the drawing board table 9 which are conventionally provided separately on the lower jaw plate B are combined into the instruction drawing board 33, the attachment / detachment process can be completed once and the attachment to the lower jaw plate B can be performed. Since it is fixed by the magnets of the coupling holes 36a, 36b, 36c, it can be easily attached and detached.
[0048]
For this reason, the position adjustment process and the record formation process of the instruction board 10a in clinical practice, and the attachment and detachment from the oral cavity can be performed quickly in the record formation process, gothic arch drawing process, and check bite acquisition process of the writing board 9a.
[0049]
In addition, a metal drawing plate 34 is detachably attached to the drawing plate portion 33b in front of the instruction drawing plate 33, and it is possible to detect the energization between the drawing pin 1 and the metal drawing plate portion 34. Even when the small hole in the check bite collecting process cannot be confirmed due to being blocked by the light, it can be confirmed by a buzzer sound or the like by the electric detector 200 (see FIG. 15).
[0050]
【The invention's effect】
As described in detail above, the intraoral recording apparatus of the present invention has the following effects. That is, by making the upper jaw plate A and the lower jaw plate B into a U-shape, the upper jaw plate A can be attached in close contact with the palate, and the lower jaw plate B is also positioned upward to prevent the tongue from being pressed. Further, the patient's tongue can be stored in the hollowed portion of the lower jaw plate B, and the tongue is pressed by the lower jaw plate B, and the lower jaw plate B is prevented from being lifted by the tongue pressure during recording. Precise measurement records can be performed.
[0051]
The connecting hole 27, the stud mounting hole 28 and the drawing pin mounting hole 40 provided in the upper jaw plate A, and part or all of the connecting holes 36a, 36b, 36c provided in the lower jaw plate B are formed by magnets. In addition, since no screws are used, each operation of the intraoral recording operation can be easily performed in a short time.
[0052]
Specifically, the drawing board forming pin 19, the drawing pin 1 and the chin fixing pin 18 are each fixed to the drawing pin mounting hole 40 by a magnet, so that it is easy to attach and detach and is troublesome such as screw tightening at each exchange. No operation is required.
[0053]
Since the guidance post stud 2 is fixed by the magnet of the connecting hole 27, it is easy to attach and detach for adjusting the jaw interval, there is no complicated operation, and clinical adjustment time is shortened.
[0054]
It is possible to separate the upper jaw plate connecting portion 29 and the lower jaw plate connecting portion 30 simply by loosening the plate interval fixing screw 17 in the connection releasing step, and the connection can be released in a short time.
[0055]
Furthermore, since the instruction board table 10 and the drawing board table 9 which are conventionally provided separately on the lower jaw plate B are combined into the instruction drawing board 33, the attachment / detachment process can be completed once and the attachment to the lower jaw plate B can be performed. Since it is fixed by the magnets of the coupling holes 36a, 36b, 36c, it can be easily attached and detached.
[0056]
For this reason, the position adjustment process and the record formation process of the guidance board 10a in clinical practice, and the attachment and detachment from the oral cavity can be quickly performed in the record formation process, gothic arch drawing process and check bite acquisition process of the writing board 9a.
[0057]
In addition, a metal drawing plate 34 is detachably attached to the drawing plate portion 33b in front of the instruction drawing plate 33, and it is possible to detect the energization between the drawing pin 1 and the metal drawing plate portion 34. Even when the small hole in the check bit collecting process cannot be confirmed due to being blocked by the electric detector 200, it can be confirmed by the buzzer sound by the electric detector 200.
[Brief description of the drawings]
FIG. 1 is a perspective view of an intraoral recording apparatus according to an embodiment of the present invention.
2A and 2B show the apparatus of FIG. 1 in which the connection is released, in which FIG. 1A is a perspective view of an upper jaw plate A, FIG. 2B is a connection device C, and FIG.
3A is a plan view of the upper jaw plate A, FIG. 3B is a bottom view thereof, FIG. 3C is a jaw fixing pin, FIG. 3D is a drawing board forming pin, and FIG. .
4A is a plan view of a lower jaw plate B, and FIG. 4B is a plan view thereof.
FIG. 5 is a plan view of a maxillary plate A in the prior art.
6 is a front view showing a partial cross section taken along line IIA-IIA in FIG. 5;
FIG. 7 is a partially enlarged cross-sectional view of a conventional pin device.
FIG. 8 is a right side view of a conventional lower jaw plate B.
FIG. 9 is a sectional view of a prior art drawing board.
FIG. 10 is a cross-sectional view in which a drawing board, a guidance board, and a jaw movement path are formed on the surface of a lower jaw plate B of the prior art.
FIG. 11 is a perspective view of a conventional instruction board.
FIGS. 12A and 12B are a plan view and a front view of a connecting device according to the prior art, respectively.
FIG. 13 is a perspective view showing a position in the upper jaw of a maxillary plate of the prior art.
FIG. 14 is a perspective view showing a position in a lower jaw of a lower jaw plate of a conventional technique.
FIG. 15 is a schematic diagram showing connection with a conventional electric detector.
FIG. 16 is a perspective view showing an adjustable articulator.
[Explanation of symbols]
A Upper jaw plate B Lower jaw plate a Upper jaw plate body b Lower jaw plate body C Connecting instrument d Lower jaw plate recording floor connection e Front end portion of upper jaw plate body f Pin device g Lower end plate body front end h Pin holding device X Upper jaw recording floor Y Mandibular recording floor m Magnet 1 Drawing pin 2 Guiding strut stud 3 Motion path formation auxiliary stud 4 Rotating ball 5 Pin stopper 6 Elastic material 7 Elastic material stop 8 Stud fixing screw 9 Drawing table 9a Drawing board 10 Guiding table 10a Guiding board 11 Exercise Path forming table 11a Movement path record 12 Metal wire connecting part 13 Connecting screw 14 Connecting shaft 15 Upper jaw plate supporter 16 Lower jaw plate supporter 17 Plate interval fixing screw 18 Jaw fixing pin 19 Drawing board forming pin 20 Pin spacer 23 Pin spring 24 Cylinder Shape holding part 25 Mandibular plate body Fixed screw 26 Guiding plate fixing screw 27 Upper jaw connecting hole 28 Stud mounting hole 29 Upper jaw plate connecting portion 30 Lower jaw plate connecting portion 31a, b Stud 32a, b, c Stud 33 Guidance drawing plate 33a Guiding plate portion 33b Drawing plate portion 34 Metal drawing Plate part 35 Metal drawing board mounting screw 35a Screw holes 36a, b, c Mandible connection hole 36m Mandible connection magnet part 40 Drawing pin installation hole 40m Pin connection magnet part

Claims (1)

Consists maxillary plate, a connecting device for connecting the lower jaw plate and these, the upper jaw plate are positioned at the center of the upper plate body has a U-shape, connecting the guidance post stud forming a locus teaching描記plate the stud mounting hole which is opened downward for connecting the opened connecting hole and the connecting device downward for, positioned at the front end of the front end portion that extends forwardly of the central portion of the upper plate body, guidance描記At the U-shaped rear end of the upper jaw plate body, the drawing pin mounting hole opened downward for attaching any of the drawing pin, the drawing board forming pin, and the chin fixing pin, which forms a locus on the plate located, symmetrically respectively projecting downward and an auxiliary stud forming the two movement paths,
The lower jaw plate, positioned at the center of the lower jaw plate body in which the U-shaped, and connecting holes for connecting the teaching描記plate or connection device, located in the rear end portion of the U-shaped lower jaw plate body, symmetrical And an exercise path formation table provided respectively in
The coupling device includes an upper jaw plate coupling portion having a stud for coupling to the upper jaw plate, a lower jaw plate coupling portion having a stud for coupling to the lower jaw plate, an upper jaw plate coupling portion, and a lower jaw plate coupling portion. With plate spacing fixing screws for connection,
Each of the connecting hole, stud mounting hole, drawing pin mounting hole, and connecting hole, drawing pin, drawing plate forming pin , and jaw fixing pin provided in the upper jaw plate are formed of magnets. An oral recording device characterized by comprising:

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