JPH0686717U - Lower jaw movement coordinate measuring machine - Google Patents

Abstract

(57) [Summary] [Purpose] The conventional mandibular movement measuring device only displays the three-dimensional coordinates of only one arbitrary point on the lower jaw. Therefore, the rotation of the lower jaw with respect to the XYZ axes must be ignored, and the lower jaw movement cannot be measured in detail. In order to overcome the drawbacks, the present invention measures the three-dimensional coordinate values of the lower jaw with respect to the XYZ axes and the rotation angle with respect to the XYZ axes, that is, the six degrees of freedom of the lower jaw, and enables a more advanced study of lower jaw movement. is there. [Structure] A three-dimensional measuring device using magnetism (a magnetism generating coil, a magnetic sensor coil, an arithmetic unit), a computer, and a device for attaching the coil to a living body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a measuring device for mandibular movement using magnetism. The field of use could be in the dentistry, especially in the fields of dental research and treatment.

[0002]

[Prior art]

 In the conventional mandibular movement measurement device, a pen is attached to the lower jaw, the structure is such that the pen moves in accordance with the movement of the lower jaw, and the movement of the lower jaw is transcribed on paper or the like. However, this method was difficult to quantify because it was not possible to directly quantify it, and it was difficult to analyze, etc., and the device was complicated and its attachment to the living body was complicated. In recent years, several mandibular movement measuring devices using computers have been put into practical use, but most of them only display three-dimensional coordinates of any one arbitrary point of the mandibular movement. However, the lower jaw is a rigid body, and its movements are not only front-back and left-right movements, but also complex movements involving rotational movement. Therefore, in the conventional device, although it is possible to obtain the three-dimensional coordinate values with respect to the XYZ axes of an arbitrary point of a certain lower jaw, the rotation about each of the XYZ axes is completely ignored. It was hard to say that they were measuring and evaluating in detail. In addition, there are some devices that can measure the rotation about the XYZ axes, but the mainstream of this is to directly measure the movement through a measuring device directly between the upper and lower jaws. Due to the mechanical structure, the size of the sensor has increased, the weight of the sensor has increased due to the size increase, and contact measurement has occurred due to direct measurement, making it difficult to reproduce physiological movements of the lower jaw. .

[0003]

[Problems to be solved by the device]

 In order to overcome the drawbacks, the present invention can measure the three-dimensional coordinate value of the lower jaw and the rotation angle with respect to each of the XYZ axes, that is, the six degrees of freedom of the lower jaw, from measurement to display / analysis / evaluation / storage. We will manufacture a device that has a simple operability that can be performed by a series of operations using a computer, and that can reduce the size and weight of the sensor in order to reduce discomfort and can perform indirect measurement without contact resistance. The research was advanced to the subject.

[0004]

[Means for Solving the Problems]

 Measuring the six degrees of freedom of the lower jaw means specifying three arbitrary points and defining a plane. The present invention is composed of a three-dimensional measuring device using magnetism (magnetism generating coil, magnetic sensor coil, arithmetic unit), a coil attaching device to a living body, and a host computer. When current is applied to the three magnetic field generating coils in a time-division manner, the magnetism generated from each magnetic field generating coil is measured as an electromotive current by the three magnetic sensor coils. This data can be obtained as 9 (3 × 3), which is the number of combinations of 3 magnetic generation coils and 3 magnetic sensor coils. One point can be specified if there are three distance data, so three points can be specified if there are nine distance data. One plane can be defined if there are three points. Using such a three-dimensional measuring device, the coil attachment device fixes the magnetic sensor coil to the lower jaw, and the coil attachment device also fixes the magnetic field generation coil to the part other than the lower jaw (preferably a frontal region with thin soft tissue) (magnetic sensor). The coil and the magnetism generating coil may be reversed.), Which enabled the host computer to calculate the three-dimensional coordinate values of the lower jaw and the rotation angle for each of the XYZ axes. Also, the coil is small and lightweight, and because it uses magnetism for measurement, there is no contact resistance, so there is very little discomfort during use. In addition, the host computer not only calculates the three-dimensional coordinate value of the lower jaw and the rotation angle for each of the XYZ axes, but also various data such as correction, various graphics, recording on the recording device, and analytical calculation. Programming is done so that various processing can be added.

[0005]

[Action]

 The present invention operates based on the above principle, and because the coil is small and lightweight and performs indirect measurement, it is possible to measure the three-dimensional coordinates of the lower jaw and the rotation angle with respect to the XYZ axes with little discomfort. it can. In addition, all movements of the lower jaw can be represented by numbers, which facilitates analysis. In addition, the movement of the lower jaw can be displayed by computer graphic, so that the movement of the lower jaw can be objectively understood.

[0006]

【Example】

 In order to carry out the present invention, various methods such as better mounting method of magnetic generation coil and magnetic sensor coil, correction method at measurement place with bad magnetic conditions, improvement of accuracy by increasing the number of coils, self-diagnosis function, etc. The method is being implemented.

[0007]

[Effect of device]

 The conventional mandibular movement measuring device can obtain only the three-dimensional coordinate values of a specific point on the lower jaw, and completely ignores the rotation of the lower jaw. This device made it possible to measure the mandibular movement in detail, which could not be obtained by the conventional device, and was useful for more advanced elucidation of the mandibular movement. In addition, the sensor is small and lightweight, and because of indirect measurement using magnetism, there is very little discomfort, making it easier to reproduce the physiological movements of the lower jaw. With the cooperation of the test subjects, it became possible to apply the technique to the jaw movements of adults as well as children, even for long-term measurements. In addition, since the obtained data can be displayed in computer graphics, it is easy to objectively understand the movements of the lower jaw, and explanation to patients with little specialized knowledge becomes very easy.

[Brief description of drawings]

FIG. 1 is an overall view of the device.

FIG. 2 is a state in which a coil is attached. A headband (made of cloth) is wrapped around the frontal region-temporal region-occipital region (the back is a magic tape-like structure that can be stopped with one touch), and the magnetic field generating coil is also a magic tape-like structure on the frontal region. It is fixed with one touch. The magnetic sensor coil is attached to the labial surface of the lower anterior tooth (the labial side of the lower teeth) with a jig and an adhesive tape.

[Explanation of code] Headband Magnetic generation coil Mounting jig Magnetic sensor coil Mandibular bone cord mounting bracket

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[Procedure amendment]

[Submission date] February 16, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Name of device

[Correction method] Change

[Correction content]

[Title of device] Three-dimensional measuring device for mandibular movement

Claims (1)

[Scope of utility model registration request] 1. A six-degree-of-freedom measurement of mandibular movement using magnetism.