JPH06254108A - Occluding movement measuring device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an occlusal movement measuring device that can easily and satisfactorily measure the occlusal movement state on the side of a treatment chair. [Composition] A subject's head fixing and holding means, a mandibular movement measuring element incorporating a horizontal plane angular velocity sensor for detecting a horizontal plane angular velocity of the subject's lower jaw, and a sagittal plane angular velocity sensor for detecting sagittal plane angular velocity of the lower jaw, A to A-D convert the output
-D converter, an angle deriving circuit that derives a horizontal plane angle and a sagittal plane angle by integrating the mandibular gliding speed and the mandibular opening velocity output from the A-D converter, and the mandibular movement trajectory from the respective angles and the like. And a motion trajectory deriving circuit for deriving A-
It is preferable to include a data processing device that integrates the lower jaw sliding speed and the lower jaw opening / closing speed output from the D converter to derive the horizontal plane angle and the sagittal plane angle. The horizontal plane angular velocity sensor is a horizontal plane piezoelectric vibrating gyro, the sagittal plane angular velocity sensor is a sagittal plane piezoelectric vibrating gyro, and the horizontal plane piezoelectric vibrating gyro and the sagittal plane piezoelectric vibrating gyro are fixed to the triangular prism vibrator and each surface thereof. And a piezoelectric body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an occlusal movement measuring device for measuring occlusal movements in order to detect occlusal abnormalities in dentistry or to determine a treatment method therefor. The present invention relates to a device capable of easily measuring a state with sufficient accuracy.

[0002]

2. Description of the Related Art Conventionally, the following two types of measuring devices have been provided for measuring the mandibular movement in dental clinics, particularly in prosthodontics or orthodontic treatment for diagnosing occlusal function and repairing it. That is, the first measuring device is a Sironasograph, MKG or Pantograph. These measure the behavior of a magnetic field, for example, and analyze the movement. The second measuring device is, for example, a Gothic arch tracer. For example, the pen is fixed on the lower jaw side and the movement is depicted on the upper jaw plate.

However, the first measuring device is complicated and heavy and is mainly used for research, and is not used in general therapy. Since the second measuring device is too simple, there are problems that it is necessary for diagnosis and very little information can be obtained.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an occlusal movement measuring device which can be used easily and with necessary accuracy on the side of a treatment chair in daily clinical treatment. is there.

[0005]

Means for Solving the Problems The present invention is to provide a head fixing and holding means for a subject, a horizontal plane angular velocity sensor for detecting a horizontal plane angular velocity of a subject's lower jaw, and a sagittal plane angular velocity sensor for detecting a sagittal plane angular velocity of the lower jaw. A mandibular movement measuring element having a built-in body, an A-D converter for A-D converting the output of the measuring element, a lower jaw sliding speed and a lower jaw opening speed output from the A-D converter, and a horizontal plane angle and It is an occlusal movement measuring device characterized by comprising an angle deriving circuit for deriving a sagittal plane angle, and a motion trajectory deriving circuit for deriving a motion trajectory of a lower jaw from the respective angles and the like. In the above occlusal motion measuring apparatus of the present invention, it is preferable that the horizontal plane angular velocity sensor is a horizontal plane piezoelectric vibration gyro, and the sagittal plane angular velocity sensor is a sagittal plane piezoelectric vibration gyro. Further, it is also preferable that the horizontal plane piezoelectric vibrating gyro and the sagittal plane piezoelectric vibrating gyro include a triangular prism vibrator and a piezoelectric body fixed to each surface thereof. Further, the piezoelectric body may be composed of one excitation piezoelectric body and two detection piezoelectric bodies, and it is also preferable that the output of the detection piezoelectric body is differentially amplified. It is preferable that the triangular prism vibrator of the horizontal piezoelectric vibration gyro has a horizontal section, and the triangular prism vibrator of the sagittal piezoelectric vibration gyro has a vertical cross section. Further, an A-D converter for A-D converting the output of the probe, and the A-D converter.
It is preferable to provide a data processing device that integrates the mandibular sliding speed and the mandibular opening / closing speed output from the transducer to derive the horizontal plane angle and the sagittal plane angle.

The occlusal movement measuring apparatus of the present invention is provided with a head fixing and holding means for suppressing the shaking of the head of the subject when measuring the mandibular movement, which is, for example, a head pressing support attached to the upper end of the column. The head is pressed against the headrest and the head is fixedly held on the headrest by a band or the like. As a result, it is possible to suppress the sway of the head and stop it, it is possible to accurately detect the locus of movement of the lower jaw point, etc., and it is possible to quickly and simply measure even a relatively light occlusal abnormality.

Further, a triangular prism vibrating body is used as an angular velocity sensor, and an exciting piezoelectric body, a right detecting piezoelectric body and a left detecting piezoelectric body are fixed to the three surfaces of the vibrating body, and the output signals thereof are differentially amplified to detect the angular velocity. The characteristics can be more precise. Then, the mandibular movement measuring element arranges two angular velocity sensors such as a piezoelectric vibrating gyro with different installation angles in order to detect the angular velocity of the horizontal plane and the sagittal plane,
For example, the movement of the lower jaw can be detected with high accuracy of about 1/10 to 1/100 mm.

[0008]

Embodiments of the occlusal movement measuring apparatus of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram of an occlusal movement measuring apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram of a piezoelectric vibrating gyro used in this embodiment, and FIG. 3 is a perspective view showing a main part of an angular velocity detector, FIGS. FIG. 6 is an explanatory view showing an example of the operation of the angular velocity detector, and FIG. 7 is a perspective view showing the subject's lower jaw movement measuring element and the subject's head fixing and holding means of the occlusal movement measuring apparatus of the embodiment of the present invention.

As shown in FIG. 1, the occlusal movement measuring apparatus 1 of the embodiment of the present invention comprises a subject's lower jaw movement measuring element 2, a subject's head fixing and holding means 3 (see FIG. 7 (A)), a movement processing section 4 and an accessory. The image display device 5 is used for the purpose. The mandibular movement measuring element 2 includes an angular velocity sensor 6 such as a horizontal plane piezoelectric vibration gyro that detects an angular velocity of a cutting tooth point in a horizontal direction, and a sagittal plane piezoelectric vibration gyro that detects an angular velocity of a cutting tooth point in a sagittal plane direction. An angular velocity sensor 7 is included, and each of these sensors 6 and 7 is, for example, as shown in FIG.
Vertically and horizontally arranged at an angle of °, for example box 8
It is housed inside. The box 8 is connected to the mouthpiece 9 to form an integral structure. The mouthpiece 9 is fixed to the incisor point of the lower jaw or in the vicinity thereof by temporary adhesion or the like, and is sandwiched and fixed between the lip of the lower jaw and the incisor.

The subject head fixing means 3 comprises a headrest 10 attached to the upper end of a column 13 and a fixing band. Velcro fasteners 12 and 12 ′ are attached to the respective ends of the fixing band 11. When measuring the occlusal movement, the head of the subject is fixed to the headrest 10 by the fixing band 11.

The structure of an example of the horizontal plane angular velocity sensor 6 of the probe 2 will be described in more detail. As shown in FIG. 2, the horizontal plane angular velocity sensor 6 includes an angular velocity detector 14 and an angular velocity processor 15. As shown in FIG. 3, the angular velocity detector 14 has an excitation piezoelectric body 17, a right detection piezoelectric body 18, and a left side piezoelectric body 17 on three opposing surfaces of a triangular prism vibrating body 16 made of an elinvar material (a constant elastic material made of a Ni—Cr alloy). Detection piezoelectric body 1
9 is fixed and formed.

An AC waveform is input to the excitation piezoelectric body 17 from the oscillation circuit 20 as shown in FIG. The vibration waveform input in this manner is output as an AC waveform from the right detection piezoelectric body 18 and the left detection piezoelectric body 19. As for the output waveform, when the angular velocity detecting body 14 is not rotating, the amplitudes of the output waveforms of the right detecting piezoelectric body 18 and the left detecting piezoelectric body 19 are equal as shown in FIG. On the other hand, when the angular velocity detector 14 is rotated, the amplitude of its output waveform becomes unequal. In the case of a left turn, the amplitude of the output waveform of the left detection piezoelectric body 19 becomes large as shown in FIG. In the case of right turn, the opposite is true as shown in FIG. 6, and the amplitude of the output waveform of the right detection piezoelectric body 18 becomes large. By the above, the rotation direction and its speed are detected. The sagittal plane angular velocity sensor 7 (see FIGS. 1 and 7) of the probe 2 has the same configuration as the horizontal plane angular velocity sensor 6 described above.

Next, the angular velocity processing unit 15 of the horizontal plane angular velocity sensor 6 will be described with reference to FIG. The angular velocity processing unit 15 includes a first differential amplifier circuit 21, a second differential amplifier circuit 22, a third differential amplifier circuit 23, a detection circuit 24, a smoothing circuit 25, etc., and the first differential amplifier circuit 21. , Outputs the difference between the output waveform of the left detection piezoelectric body 19 and the reference waveform. The second differential amplifier circuit 22 outputs the difference between the output waveform of the right detection piezoelectric body 18 and the reference waveform. When the output waveform of the first differential amplifier circuit 21 and the output waveform of the second differential amplifier circuit 22 are input, the third differential amplifier circuit 23 outputs the difference between them. The detection circuit 24 detects the output of the third differential amplifier circuit 23, and the smoothing circuit 25 smoothes the output waveform of the detection circuit 24.

Next, the motion processing unit 4 of the occlusal motion measuring apparatus 1 according to the embodiment of the present invention will be described with reference to FIG. The motion processing unit 4 includes a horizontal plane AD converter 26, a sagittal plane A / D converter 27, a horizontal plane angle deriving circuit 28, and a sagittal plane angle deriving circuit 2.
9, a motion locus deriving circuit 30 and the like. The horizontal plane AD converter 26 performs analog-digital conversion on the output of the horizontal plane angular velocity sensor 6. The sagittal plane AD converter 27 performs analog-digital conversion on the output of the sagittal plane angular velocity sensor 7.

The horizontal plane angle deriving circuit 28 uses the horizontal plane A-
The horizontal plane angle is derived by integrating the output of the D converter 26.
The sagittal plane angle deriving circuit 29 integrates the output of the sagittal plane A-D converter to derive the sagittal plane angle. The motion trajectory deriving circuit 30 derives, for example, numerical data of the limit motion path of the incisal tooth point from the outputs of the horizontal plane angle deriving circuit 28 and the sagittal plane angle deriving circuit 29, that is, the horizontal plane angle and the sagittal plane angle.

The image display device 5 displays an image of, for example, the limit motion locus of the incisal point based on the output data of the motion processing unit 4. A two-dimensional or three-dimensional image can be displayed by a CRT, a printer, a plotter or the like via a CPU or the like. An actual image display example is shown in FIGS. For convenience of explanation, the explanatory diagram showing the motion limit of the incisal point in FIG. 10 is used.
Here, a is a cusp-fitting position, b is a lateral slide limit point, c is a posterior tooth contact position, a-c is a rear runway, a-d is a front limit road, and a-b is a lateral runway, c. -D is a rear limit lateral runway, and c-e is a rear limit runway. FIG. 8 is a projection view in the H direction of FIG. 10, that is, a horizontal plane projection view. FIG. 9 is a projection view in the F direction of FIG. 10, that is, a frontal plane projection view. 8 and 9, the movement path of a normal person is shown by a solid line, and the movement trajectory of an occlusal person is shown by a dotted line. In this way, the occlusal disorder is accurately detected from the abnormality of the movement trajectory.

FIG. 11 shows a block diagram of another embodiment of the occlusal movement measuring apparatus of the present invention. The occlusal movement measuring device of this embodiment is composed of a horizontal plane angular velocity sensor 6, a sagittal plane angular velocity sensor 7,
It is composed of a horizontal plane A / D converter 26, a sagittal plane A / D converter 27, a data processing device 31, and an image display device 5. The analog angular velocities output from the horizontal plane angular velocity sensor 6 and the sagittal plane angular velocity sensor 7 are converted into digital values by the horizontal plane A / D converter 26 and the sagittal plane A / D converter 27. The data processing device 31 is composed of a CPU, a memory, and a program stored in the memory. As this program, for example, (1) horizontal plane angle derivation, (2) sagittal plane angle derivation, (3) motion trajectory derivation, etc. are used. Here, the output angular velocities are integrated, and then position data for the motion locus is combined according to the angle and the like, and the image display device 5 displays the image. In this way, for example, the incision point limit motion locus is displayed as an image.

[0018]

As described above, the occlusal movement measuring apparatus of the present invention includes the subject head fixing and holding means, the horizontal plane angular velocity sensor for detecting the horizontal plane angular velocity of the subject's lower jaw, and the sagittal plane for detecting the sagittal plane angular velocity of the lower jaw. A mandibular movement probe with a built-in angular velocity sensor, an AD converter for A / D converting the output of the probe, a mandibular sliding velocity and a mandibular opening velocity output from the A / D converter, and a horizontal plane angle and Since it comprises an angle deriving circuit for deriving the sagittal plane angle, and a motion trajectory deriving circuit for deriving the motion trajectory of the lower jaw from each angle, etc.,
The occlusal movement state of the subject can be measured easily and accurately on the side of the treatment chair. A piezoelectric vibrating gyro is used as an angular velocity sensor, especially a triangular prism vibrating body, and part 3
In the case of the invention in which the excitation piezoelectric body, the right detection piezoelectric body, and the left detection piezoelectric body are fixed to the surface and the output signals thereof are differentially amplified, the angular velocity detection characteristics are extremely highly accurate.

[Brief description of drawings]

FIG. 1 is a block diagram of an occlusal movement measuring apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of an angular velocity sensor.

FIG. 3 is a perspective view showing a main part of an angular velocity detector.

FIG. 4 is an explanatory diagram showing an example of the operation of the angular velocity detector.

FIG. 5 is an explanatory diagram showing an example of the operation of the angular velocity detector.

FIG. 6 is an explanatory diagram showing an example of the operation of the angular velocity detector.

FIG. 7 is a perspective view showing a tracing stylus and a head fixing means of the occlusal movement measuring apparatus of this embodiment.

FIG. 8 is an enlarged horizontal plan view of a motion limit path of an incisal point.

FIG. 9 is an enlarged frontal projection view of a motion limit path of an incisal point.

FIG. 10 is an explanatory diagram showing a motion limit of an incisal point.

FIG. 11 is a block diagram showing another embodiment of the occlusal movement measuring apparatus of the present invention.

[Explanation of symbols]

1 occlusal movement measuring device 2 subject's mandibular movement measuring element 3 subject's head fixing and holding means 4 motion processing unit 5 image display device 6 horizontal plane angular velocity sensor 7 sagittal plane angular velocity sensor 8 box 9 mouthpiece 10 headrest 11 fixed band 12, 12 ' Velcro fastener 13 Strut 14 Angular velocity detector 15 Angular velocity processing unit 16 Triangular prism vibrating body 17 Excitation piezoelectric body 18 Right detection piezoelectric body 19 Left detection piezoelectric body 20 Oscillation circuit 21 First differential amplification circuit 22 Second differential amplification circuit 23 Third Differential amplifier circuit 24 Detection circuit 25 Smoothing circuit 26 Horizontal plane A
-D converter 27 Sagittal plane A-D converter 28 Horizontal plane angle deriving circuit 29 Sagittal plane angle deriving circuit 30 Motion trajectory deriving circuit 31 Data processing device

Claims (7)

[Claims] 1. A subject's head fixing and holding means, a mandibular movement measuring element incorporating a horizontal plane angular velocity sensor for detecting a horizontal plane angular velocity of the subject's lower jaw and a sagittal plane angular velocity sensor for detecting a sagittal plane angular velocity of the lower jaw, and the measurement. An A-D converter for A-D converting the output of the child, and an angle deriving circuit for deriving a horizontal plane angle and a sagittal plane angle by integrating the lower jaw sliding velocity and the lower jaw opening velocity output from the A-D converter. An occlusal movement measuring device comprising: a movement locus deriving circuit for deriving a movement locus of the lower jaw from the respective angles and the like. 2. The occlusion according to claim 1, further comprising a data processing device for deriving a horizontal plane angle and a sagittal plane angle by integrating a lower jaw sliding speed and a lower jaw opening / closing speed output from the AD converter. Motion measuring device. 3. The occlusal movement measuring device according to claim 1, wherein the horizontal angular velocity sensor is a horizontal piezoelectric vibrating gyro, and the sagittal angular velocity sensor is a sagittal piezoelectric vibrating gyro. measuring device. 4. The occlusal movement measuring apparatus according to claim 3, wherein the horizontal plane piezoelectric vibration gyro and the sagittal plane piezoelectric vibration gyro are provided with a triangular prism vibrator and a piezoelectric body fixed to each surface thereof. Occlusal movement measuring device. 5. The occlusal movement measuring device according to claim 4, wherein the piezoelectric body comprises one excitation piezoelectric body and two detection piezoelectric bodies. 6. The occlusal movement measuring device according to claim 5, wherein the output of the detection piezoelectric body is differentially amplified. 7. The occlusal movement measuring device according to claim 3, wherein the horizontal prisms of the horizontal piezoelectric vibration gyro have horizontal cross sections, and the triangular vibrations of the sagittal piezoelectric vibration gyro. The occlusal movement measuring device is characterized in that the child has a vertical section.