JPH021493B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for measuring jaw movement, and particularly to a device that directly displays upper and lower jaw movements.

[Conventional technology and its problems]

A device has been proposed that measures the movement of the lower jaw by attaching a light source to the lower jaw and detecting the movement of the light source using an optical sensor (Japanese Patent Laid-Open No. 53-89296). This device is
A light source that emits light forward is attached to the mandibular gums, an optical sensor is placed in front of the light source through a lens, and the signal from the optical sensor is amplified and recorded on an XY recorder and data recorder. There is.

Furthermore, as another jaw movement measuring device, a device that detects the movement of the lower jaw using three potentiometers has been proposed (Japanese Utility Model Application Publication No. 54-34290). This device has a frame fixed to the patient's head, and uses three potentiometers to detect the forward-backward, left-right, and up-and-down movements of the lower jaw.

However, these conventional jaw measurement devices cannot directly display jaw movements; the electrical signals must be processed and then displayed on an XY recorder or monitor scope, making the entire device complex and extremely expensive. There was a drawback.

Furthermore, with conventional devices that measure the movement of the lower jaw using light, if the jaw moves together with the lower jaw, the movement of the head is detected as the movement of the lower jaw, and it is not possible to distinguish between the movement of the jaw and the movement of the head. For this reason, if the patient moves his or her head during measurement, it may cause errors, so it is necessary to keep the head fixed and move the jaw. However, if you have to lower your jaw and open your mouth as wide as possible, you will not be able to lower your jaw to its fullest extent and open your mouth as wide as possible unless you move your head slightly upwards. For this reason, the patient's head moves during measurement, which tends to cause measurement errors, making it difficult to perform highly accurate measurements.

Furthermore, mandibular movement measuring devices that use a potentiometer have a complicated mechanism that transmits the vertical, longitudinal, and horizontal movements of the jaw to the potentiometer, and moreover, the mechanism for transmitting the vertical, longitudinal, and horizontal movements of the jaw to the potentiometer is complicated. The amount of movement of the potentiometers is different, that is, each potentiometer cannot independently detect the movement of the jaw. Since the movement of each potentiometer changes as a function of the movement of other potentiometers, it also has the disadvantage that calculation processing becomes considerably difficult.

Furthermore, an intraoral memory device was developed as a recording device for the sliding movement of the jaw (Special Publication No. 59-18053).
Publication No.). This device is set in the oral cavity, and has a drawing pin fixed to the upper jaw and a drawing plate fixed to the lower jaw. Place this device in your mouth,
The writing pin is configured to print on the writing board upon sliding movement of the jaw.

Although this device can examine the sliding movement of the jaw, it cannot examine the movement of the temporomandibular joints or molars. This is because only the relative motion of one point is measured.

The lower jaw does not rotate around a single point relative to the upper jaw. The lower jaw opens and closes while moving back and forth relative to the upper jaw. That is, the temporomandibular joint opens and closes the lower jaw by sliding it back and forth. If the lower jaw opens and closes around a specific point on the temporomandibular joint, the movement of the lower jaw can be measured from other fixed trajectories. However, the movement of the lower jaw, which moves back and forth to open and close, cannot be determined from a fixed movement trajectory. If the movement of the mandible cannot be determined, the movement of the temporomandibular joint cannot be investigated.

Furthermore, a device for measuring jaw movement has been developed that includes a recording plate and a recording axis near the temporomandibular joint (Japanese Patent Application Laid-Open No.
56-34335). However, like the above-mentioned devices, this jaw movement measuring device cannot examine the movement of the entire lower jaw. This is because this device qualitatively measures the relationship between the upper and lower jaws at one point (only the traced trajectory). In addition, this device
Since jaw movement is measured near the temporomandibular joint, it is difficult to measure accurately. This is because the movement near the temporomandibular joint is small, so measurement errors are likely to occur.

The present invention has been developed with the aim of eliminating these drawbacks of the prior art, and an important objective of the present invention is that the entire device can be manufactured at a significantly lower cost;
An object of the present invention is to provide a jaw movement measuring device that directly displays jaw movements and can be conveniently used.

Another important object of the present invention is that the movement of the lower jaw relative to the upper jaw is displayed, so that even if the head moves during measurement, it will not cause measurement errors and the movement of the jaw can be easily and accurately measured. The object of the present invention is to provide a measuring device that can measure jaw movement.

[Means to solve conventional problems]

The jaw movement measurement device of the present invention has the following configuration.

(a) Upper jaw attachment device 3a, lower jaw attachment device 3b, upper jaw recording sheet 1a, lower jaw recording sheet 1b, upper jaw print member 2a, and lower jaw print member 2b.
and synchronization mark generating means.

(b) The maxillary print member 2a and the maxillary recording sheet 1 are connected to the maxillary attachment device 3a for attaching them to the upper jaw, and move together with the maxillary attachment device 3a.

(c) Mandibular print member 2b and mandibular recording sheet 1b
means the lower jaw fitting 3b which is attached to the lower jaw.
The lower jaw attachment device 3b moves in unison with the lower jaw attachment device 3b.

(d) The upper jaw recording sheet 1a and the lower jaw recording sheet 1b are arranged parallel to each other.

(e) The upper jaw recording sheet 1a and the lower jaw recording sheet 1b are placed in front of the face so that the movement of the lower jaw relative to the upper jaw can be displayed in a large size.

(f) The upper jaw print member 2a is the lower jaw recording sheet 1b.
The upper jaw printing member 2a prints the relative movement between the upper jaw and the lower jaw on the lower jaw recording sheet 1b.

(g) The lower jaw print member 2b is the upper jaw recording sheet 1a.
The lower jaw printing member 2b prints the relative movement between the upper jaw and the lower jaw on the upper jaw recording sheet 1a.

(h) The synchronization mark generation means is the jaw printing member 2.
The upper jaw print member 2a and the lower jaw print member 2b are connected to the lower jaw print member 2b and the lower jaw print member 2b, and the upper jaw print member 2a and the lower jaw print member 2b are configured to simultaneously attach a synchronization mark to the lower jaw recording sheet 1b and the upper jaw recording sheet 1a.

[Effect]

In the jaw movement measuring device according to the preferred embodiment of the present invention shown in FIGS. 1 and 2, an upper jaw recording sheet 1a and an upper jaw print member 2a are attached to the upper jaw, and a lower jaw recording sheet 1b is attached to the lower jaw. , and the lower jaw print member 2b are attached. FIG. 1 shows a portion for recording the movement of the upper jaw relative to the lower jaw, and FIG. 2 shows a portion for recording the movement of the lower jaw relative to the upper jaw.

As shown in FIG. 1, a mandibular recording sheet 1b fixed to the lower jaw is placed in front of the face and is attached vertically, and a mandibular recording sheet 1b is fixed to the upper jaw by approaching or touching one side of the mandibular recording sheet 1b. A maxillary print member 2a is provided. When the lower jaw moves relative to the upper jaw, the lower jaw recording sheet 1b moves together with the lower jaw, and the movement of the upper jaw relative to the lower jaw is recorded on the lower jaw recording sheet 1b.

In addition, in FIG. 2, the upper jaw recording sheet 1a is placed vertically at the front of the face, and the lower jaw recording sheet 1b is fixed to the lower jaw in contact with or close to one side of the upper jaw recording sheet 1a. will be placed. In this state, when the lower jaw moves by opening and closing the mouth, the lower jaw print member 2b moves together with the lower jaw, and the movement of the lower jaw relative to the upper jaw is recorded on the upper jaw recording sheet 1a.

That is, recording sheets 1a and 1 are placed on both the upper and lower jaws.
b and print members 2a, 2b are attached, and when the lower jaw moves, the two recording sheets 1a, 1b will have
The movement trajectory of the jaw is recorded separately.

Further, a synchronization mark generating means is connected to the upper jaw print member 2a and the lower jaw print member 2b. The maxillary print member 2a and the mandibular print member 2b connected to the synchronization mark generating means generate the mandibular recording sheet 1b and the maxillary recording sheet 1a at the same time.
The synchronization mark is attached to the synchronization mark.

Therefore, the upper jaw recording sheet 1a and the lower jaw recording sheet 1, which display the movement trajectories of two different points,
It is possible to accurately measure which locations a vehicle has passed at a specific time.

In this way, the relative movement trajectories of the lower jaw and the upper jaw are displayed separately on the two recording sheets, and
Among synchronization marks, those that display relative transit times can accurately measure the movement of the entire mandible when considering the mandible as a rigid body. If necessary, the movement of the temporomandibular joints and molars can be calculated qualitatively and quantitatively by inputting the display trajectories of the two recording sheets into a computer, making it useful as a diagnostic index in clinical medicine. There are features that can be used.

Furthermore, the jaw movement measuring device of the present invention is composed of a recording sheet, a printer member, and a fitting for attaching these to the jaw, and has a simple structure and can be mass-produced at low cost. Another feature is that the movement can be directly displayed, making it convenient to use.

Furthermore, since the jaw movement measuring device of the present invention has the upper jaw recording sheet 1a and the lower jaw recording sheet 1b disposed in front of the face, it also has the advantage of being able to extremely accurately measure the relative movement of the lower jaw with respect to the upper jaw. This is because the front of the face is located away from the temporomandibular joints, which have little movement, and moves a lot due to jaw movement, so measurement errors can be reduced.

Furthermore, since the recording sheet records the relative movement of the jaw, even if the patient moves his or her head up and down during the measurement, it will not cause measurement errors. Therefore, jaw movement can be accurately measured even when the patient opens his mouth fully and his head is slightly tilted upward, and anyone can easily and precisely measure jaw movement.

[Preferred embodiment]

Hereinafter, one embodiment of the present invention will be described based on the drawings.

However, the embodiments shown below are intended to exemplify a device for embodying the technical idea of this invention, and this invention device specifies the material, shape, structure, and arrangement of the component parts as shown below. It's not something you do. Various modifications may be made to the device of the present invention within the scope of the claims.

Further, in this specification, numbers corresponding to the members shown in the embodiments are added to the members shown in the claims so that the claims are easy to understand. However, the members described in the claims are by no means limited to the members shown in the examples.

The jaw movement measuring device shown in FIGS. 3 to 6 is
This recording sheet consists of an upper jaw recording sheet 1a and a lower jaw recording sheet 1b which are attached vertically to the upper jaw and the lower jaw separately, and a lower jaw printing member 2b and an upper jaw printing part 2a for adding the movement of the jaw to these recording sheets.

The upper jaw print member 2a is the lower jaw recording sheet 1b.
, the lower jaw print member 2b is attached to the upper jaw recording sheet 1a.
touching or close enough to be printed on.

Although the present invention does not specify the structure and mounting position for mounting the recording sheet and print member on the upper and lower jaws, the recording sheet print member is The device can be attached to the upper jaw and the lower jaw most easily by using the lower jaw attachment device 3b and the upper jaw attachment device 3a, which are shaped to follow the outer periphery of the teeth.

The upper jaw fitting 3a and the lower jaw fitting 3b shown in FIGS. 3 and 4 have inner surfaces formed in a shape that follows the outer periphery of the front teeth, and are fitted and fixed onto the outer periphery of the teeth.

Although not shown, it is also possible to fix the maxillary print member 2a and the maxillary record sheet 1a to the head that moves together with the maxilla instead of directly fixing them to the maxilla using the maxillary attachment 3a. 3b also
It is also possible to fix it to the lower jaw instead of directly fixing it to the lower teeth.

As the recording sheet and the printing member, any member can be used that allows the printing member to approach or come into contact with the recording sheet and record the movement trajectory of the printing member. For example, the following combinations can be used:

Thermal paper is used as the recording sheet, and the printing member is a rod having a heater at the tip that contacts the recording sheet.

Photosensitive paper is used as the recording sheet, and a light source or laser diode that emits a narrow, focused light beam from the tip toward the recording sheet is used as the printing member.

Use regular paper as the recording sheet, and use a recording pen as the printing member.

Ordinary paper is used for the recording sheet, and an inkjet nozzle that ejects ink in a narrow, converging manner is used for the printing member.

Materials whose recording state can be controlled electrically, such as thermal paper, photosensitive paper, and inkjet, are particularly conveniently used in the present apparatus. This is done after the patient practices jaw movements several times with this device on (the locus of movement is not recorded at this time) and is able to move the jaw successfully, and then records the jaw movements for just one cycle. This is because the state can be controlled.

The printed member displays synchronization marks along with the movement trajectory. For example, as shown in Figure 7, 0.02
By shading the recording line at ~0.5 second intervals,
Synchronization marks are added at regular time intervals to the jaw movement trajectories recorded on the upper and lower recording sheets.

As shown in FIGS. 8 and 9, the trajectory with the synchronization mark is the recorded jaw movement trajectory.
It is possible to accurately detect which position the upper and lower printing members passed at the same time.

For example, when analyzing the measured trajectory, the maxillary and jaw movements can be calculated by assigning the number 1 from the starting point, and then sequentially assigning numbers 2, 3, 4, etc. to the darkly plotted points. The relative position at a specific time can be determined.

In this way, the upper and lower jaw movement trajectories can be identified by inputting the upper and lower jaw trajectories into a computer.
This is useful when calculating the movement of the lower jaw.

In this way, in order for the print member to attach a synchronization mark to the recording sheet, a synchronization mark generation means is connected to the print member, and in the case of a combination of thermal paper and a heater, the current applied to the heater is adjusted to correspond to the waveform shown in Fig. 7. In the case of light, the luminous intensity is temporarily increased in accordance with the waveform shown in Figure 7, and in the case of inkjet, the amount of ink jetted is temporarily increased. Bye.

The maxillary movement sheet 1a and the mandibular recording sheet 1b can be made into hard sheets and made completely replaceable. It is convenient to attach recording paper freely.

The recording paper can be adhesive tape such as double-sided adhesive tape,
Alternatively, it can be easily attached to the substrate using a magnet or the like.

When recording the locus of movement of the jaw by bonding a print member to the surface of the recording sheet, as shown in FIG. 2a and the mandibular print member 2b are pushed out elastically and lightly using an elastic body 5 such as a rubber-like elastic body or a tension spring, so that the tips thereof are brought into contact with the surfaces of the mandibular recording sheet 1b and the maxillary recording sheet 1a.

A heater and a light bulb are fixed to the tip of the print member.

When the print member is a light bulb or an exit nozzle, there is no need to bring the tip of the print member into contact with the recording sheet. Therefore, these printing members do not need to be attached to the recording sheet so that they can be moved in and out, and can be fixed to the frame.

The printing member is supplied with power through lead wires or with ink through a pump.

How to use the jaw movement measuring device configured in this way is to attach the upper and lower recording sheets 1a, 1b and print members 2a, 2b to the jaw via the upper jaw attachment 3a and lower jaw attachment 3b, Lint members 2a, 2
b can be recorded on the recording sheets 1a and 1b, the mouth is opened wide and closed, and the relative movement of the upper and lower jaws is recorded on the upper and lower recording sheets 1a and 1b.

[Brief explanation of drawings]

1 and 2 are schematic side views showing an embodiment of the present invention, FIGS. 3 and 4 are schematic perspective views of a jaw movement measuring device showing an embodiment of the present invention, and FIGS. 5 and 4 are schematic side views showing an embodiment of the present invention. Fig. 6 is a front view and right side view of a jaw movement measuring device showing an embodiment of the present invention, Fig. 7 is a graph showing signal waveforms for shading printed members, and Figs. 8 and 9 are upper jaw prints. It is a graph showing the jaw movement locus displayed on the member and the lower jaw print member. 1a... Upper jaw recording sheet, 1b... Mandibular recording sheet, 2a... Upper jaw print member, 2b... Lower jaw print member, 3a... Upper jaw fitting, 3b... Mandibular fitting, 4... Cylinder, 5... Elastic body.

Claims (1)

[Claims] 1. A jaw movement measuring device having the following configuration. (a) Upper jaw attachment device 3a, lower jaw attachment device 3b, upper jaw recording sheet 1a, lower jaw recording sheet 1b, upper jaw print member 2a, and lower jaw print member 2b.
and synchronization mark generating means. (b) Maxillary print member 2a and maxillary record sheet 1a
means the upper jaw fitting 3a which is attached to the upper jaw.
The upper jaw fitting 3a moves in unison with the maxillary fitting 3a. (c) Mandibular print member 2b and mandibular recording sheet 1b
means the lower jaw fitting 3b which is attached to the lower jaw.
The lower jaw attachment device 3b moves in unison with the lower jaw attachment device 3b. (d) The upper jaw recording sheet 1a and the lower jaw recording sheet 1b are arranged parallel to each other. (e) The upper jaw recording sheet 1a and the lower jaw recording sheet 1b are placed in front of the face. (f) The upper jaw print member 2a is the lower jaw recording sheet 1b.
The upper jaw printing member 2a prints the relative movement between the upper jaw and the lower jaw on the lower jaw recording sheet 1b. (g) The lower jaw print member 2b is the upper jaw recording sheet 1a.
The lower jaw printing member 2b prints the relative movement between the upper jaw and the lower jaw on the upper jaw recording sheet 1a. (h) The synchronization mark generation means is the upper jaw print member 2.
a and the lower jaw print member 2b, and is configured so that the upper jaw print member 2a and the lower jaw print member 2b can attach a synchronization mark to the lower jaw recording sheet 1b and the upper jaw recording sheet 1a at the same time. 2 Maxillary record sheet 1a and mandibular record sheet 1
b is a photosensitive sheet, and the upper jaw print member 2a
The jaw movement measuring device according to claim 1, wherein the lower jaw print member 2b includes a light source that emits focused light. 3 Upper jaw print member 2a and lower jaw print member 2
2. The jaw movement measuring device according to claim 1, wherein b is a recording pen. 4 Upper jaw print member 2a and lower jaw print member 2
b is the lower jaw recording sheet 1b and the upper jaw recording sheet 1.
The apparatus for measuring jaw movement according to claim 1, which is an inkjet nozzle that ejects ink to a.