JPS61240952A - Jaw motion route drawing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used in the field of dentistry and mainly relates to a jaw movement path drawing device for projecting the horizontal movement of the lower jaw on a display unit such as a screen. .

[Prior Art] In the field of dentistry, cases in which the position of the jaw must be newly determined, that is, cases requiring crown restoration of multiple teeth, cases in which multiple teeth are missing, or cases with aseptic disease are dealt with. Therefore, when manufacturing dentures, the most important thing to pay attention to is the occlusion (interlocking of teeth) when the denture is attached to the upper and lower jaws. If the teeth are not balanced evenly (order of contact, pressure when biting), the disharmony may cause occlusal pain, etc., or periodontal disease (alveolar pyorrhea, gingivitis, etc.).

In addition, if the occlusion is disharmonious, the masticatory force, which is important when ingesting food, will be reduced, which may cause problems with internal functions such as gastrointestinal diseases.

In this way, for patients with multiple teeth missing or edentulous jaws, it is not enough to simply wear dentures, but the position and movement of the jaws (maxilla and mandible) must be thoroughly confirmed before dentures are fabricated. Must be.

There are two types of jaw positioning: vertical and horizontal.The horizontal jaw position, which is performed after the vertical jaw position, is especially important. This causes disharmony and various symptoms such as those mentioned above, and the denture becomes unstable and cannot perform its functions satisfactorily.

Therefore, as shown in Fig. 5, a drawing board 3 whose surface is coated with paint, wax, marker, etc. is placed on the base floors 1 and 2 taken from the upper and lower jaws of the patient, and the drawing board 3 is contacted to the contact position. The device is equipped with a drawing needle 4 that displays , and the locus of movement of the lower jaw is recorded on the drawing board 3.
Already known.

However, this method has the following problems.

1. The patient must practice sufficiently before drawing, which causes pain to the patient, and also prevents rapid measurement and recording.

26 If the drawing fails, this is a very time-consuming and troublesome method of removing the base plate from the patient's oral cavity, applying paint or the like to the surface of the drawing board 3, and placing it in the oral cavity again.

3. Also, since the drawing board 3 is simply a board surface coated with paint or the like, it cannot be recorded or stored.

4. There is a problem with accuracy.

[Problems to be Solved by the Invention] The present invention provides a novel jaw movement path drawing device that eliminates the drawbacks of the above-mentioned prior art. That is, in the present invention, the movement trajectory of the jaw is converted into an electrical signal so that it can be displayed and recorded on a display unit outside the oral cavity, thereby making it possible to measure the movement trajectory of the jaw extremely easily and simply. The present invention is intended to provide a jaw movement path drawing device that is capable of maintaining a sufficiently high level of accuracy compared to the prior art.

[Means for Solving the Problems] In order to achieve the above object, the drawing device of the present invention has a protrusion on one of the pedestals attached to the upper jaw and the lower jaw and the protrusion on the other pedestal in the oral cavity. A two-dimensional position detection board is provided that converts the contact position of the protrusion into an electrical signal and outputs it, and a display unit that displays the contact position of the protrusion based on the output is connected to the two-dimensional position detection board. , is adopted as a technical means.

[Function] In order to use the jaw movement path tracing device of the present invention having the above configuration, it is necessary to have a pedestal having a protrusion on one of the upper and lower jaws in the patient's oral cavity, and a two-dimensional position detection board on the other side. The pedestal is attached, and the patient is asked to move the lower jaw back and forth and left and right, with the patient's mouth closed until the protrusion touches the two-dimensional position detection board.

As a result, the locus of movement of the lower jaw is projected on the display,
Doctors look at the display and determine the optimal vertical and horizontal jaw positions, which they use as basic data when making dentures.

[Example] FIG. 1 shows an example of the jaw movement path drawing device of the present invention.

This drawing device includes a detection unit that a patient wears in the oral cavity, a power supply unit that supplies power to operate the detection unit, and a calculation unit that calculates the position coordinates of the lower jaw based on the output of the detection unit. and a display section that displays the locus of the lower jaw based on the calculation results.

The detection unit includes a pair of pedestals 11 and 12 that are attached to the upper and lower jaws in the oral cavity. These pedestals 11
．． Reference numeral 12 is constituted by a base bed taken from the upper and lower jaws of the patient, similar to the conventional example explained with reference to FIG.

One of the pedestals 11 and 12 to be attached to the upper and lower jaws is provided with a projection 14, and the other pedestal 11 is provided with a projection 14 that converts the contact position with the projection 14 into an electrical signal. A two-dimensional position detection lever 13 is provided for outputting a two-dimensional position.

This two-dimensional position detection board 13 is operated by a patient who has a detection unit attached to the oral cavity, closes his or her mouth to the extent that the protrusion 14 contacts the two-dimensional position detection board 13, and moves the lower jaw back and forth and left and right in this state. It detects the coordinates of the contact position of the protrusion 14 at the time of contact, and specifically, it can be configured as follows.

Figure 2 shows an example of this, with electrodes 22 on a pair of opposite sides.
．． It has a configuration in which a pressure-sensitive conductive rubber sheet 27 is sandwiched between the sheet resistor 21 with electrodes 23 attached thereto and the sheet resistor 24 with electrodes 25 and 28 attached on the other pair of opposite sides. There is.

As the above-mentioned sheet resistor 21.24, for example, a conductive film in which indium oxide is vapor-deposited on a polyester film can be used, and the electrode attached to the opposite side is made of silk using conductive ink, paint, etc. print,
Alternatively, it can be formed by adhering a metal film such as copper foil.

The pressure-sensitive conductive rubber sheet 27 is made by dispersing metal particles such as nickel or conductive particles such as carphone black or graphite in natural rubber, silicone comb, etc.
It is a mixture of materials and is usually an insulator, but when the pressure is reduced, the electrical resistance decreases and current flows. Instead of this pressure-sensitive conductive rubber sheet 27, as shown in FIG. 3, it is also possible to use an insulating sheet 31 made of paper or the like with a large number of windows 32 arranged in rows.

The two-dimensional position detection board 13 includes, as shown in FIG.
A power supply section consisting of a foot voltage power supply and a y current circuit is connected, and a wing section consisting of differential amplifier groups A1 to A8 as shown in FIG. 4 is also connected. This calculation unit substantially calculates the coordinate values (x, y) of the contact position of the protrusion 14 as follows: Vl −V2 V3− Vs
x = k - y = k - VI + V2 V3 + Vl
(where k is a constant) It is calculated by performing the following calculation and outputs it as an electrical signal.

In addition, the above display section may be a screen of an oscilloscope, etc.
It also includes various recorders, and displays the locus of the contact position of the protrusion 14 based on the electronic output of the calculation section.

To use the above-mentioned jaw movement path drawing device, a pedestal (base #! urine) having a protrusion 14 is placed on either the upper or lower jaw in the patient's oral cavity, and a two-dimensional position detection fi is placed on the other side.
Attach the pedestal (basic method) with 13i. In this state, the patient closes his mouth until the projection 14 touches the two-dimensional position detection g113, and while lightly pressing the beam 14 against the two-dimensional position detection board 13, moves his lower jaw back and forth and from side to side.

At this time, an electrical signal is generated from the two-dimensional position detection board 13 corresponding to the contact position of the protrusion. Therefore, the doctor can determine the optimal vertical and horizontal jaw positions by looking at the display on the screen of the display unit, and use this information as basic data when manufacturing dentures.

[Effects of the Invention] According to the above-mentioned jaw movement path drawing device of the present invention, the jaw movement trajectory can be converted into an electrical signal and displayed and recorded on the display section outside the oral cavity, thereby making it possible to record the jaw movement trajectory. Not only can trajectory measurements be made extremely easily and conveniently,
Accuracy can also be maintained at a sufficiently high level compared to conventional techniques.

As can be seen from the above, if two types of pedestals are made, one with a two-dimensional position detection board and the other with a protrusion, they can be used for a variety of patients and a large number of patients. Reliable measurements can be made.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the jaw movement path drawing device of the present invention, FIG. 2 is a perspective view showing the configuration of a two-dimensional position detection board, and FIG. 3 is a configuration example of another two-dimensional position detection board. FIG. 4 is a circuit configuration diagram of the arithmetic unit, and FIG. 5 is a sectional view of the main part of a conventional example. 11.12...Pedestal, 13...Two-dimensional position detection board, 1
4...Protrusions.

Claims (1)

[Claims] 1. In the oral cavity, a protrusion is provided on one of the pedestals attached to the upper and lower jaws, and a two-dimensional position detection board that converts the contact position with the protrusion into an electrical signal and outputs it on the other pedestal, A jaw movement path drawing device characterized in that a display unit is connected to the two-dimensional position detection board to display the contact position of the protrusion based on the output thereof.