JPS5819250A - Probe instrument of apparatus for diagnosis of tooth moving degree - 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 The present invention relates to a probe used in a device for definitively diagnosing the degree of tooth movement.

Diagnosis of the degree of tooth movement is essential when examining periodontal diseases.

Conventionally, the degree of tooth movement has generally been diagnosed by the operator's feeling when moving the tooth in the buccolingual or near-far right direction with tweezers or fingers; however, this method They have the disadvantage that they cannot make sufficiently accurate judgments due to their subjective experience and individuality.

In addition, during the research stage, the top of the patient's head was firmly fixed on the headrest, and the teeth were pushed or pulled with a compression gauge.
Quantitative diagnosis was performed by measuring the tooth displacement at that time with a dental micrometer or dental dial gauge, using the left and right mouth as a reference, but the patient was forced to lie down on a resting table. This method had many drawbacks, such as the fact that only the front teeth could be diagnosed because it had to be fixed at 1ffiK and the nine molars were taken as a reference, so it was hardly ever popularized as a general method.

Furthermore, a method for measuring the resonant frequency of teeth, which is the direct background to this invention, was also used at the research stage. In other words, consider a tooth movement model in which the tooth contains viscosity and has no mass (mass of the tooth body) due to the spring, and the resonant frequency is inversely proportional to the degree of movement.In other words, as the degree of movement progresses, the resonance frequency increases. This method attempts to determine the degree of tooth movement based on the regularity of decrease.

However, this method fixes the patient's head, temporarily attaches a small acceleration sensor to the lingual side of the tooth, and then applies vibrations to the tooth using a dental hammer or an electromagnetic drive device. This method determines the vibration frequency by detecting the vibration acceleration caused by the patient's oscillation, but it is difficult to securely fix the patient's head, and it is necessary to temporarily bond an acceleration sensor to the tooth every four times and then remove it after fixation. It was complicated and unsuitable for practical use.

In view of the above-mentioned conventional circumstances, the applicant uses a piezoelectric element to detect mechanical vibrations generated at the resonant frequency of the tooth due to an impulse impact applied to the tooth as an electrical vibration, and further detects the frequency through a frequency analyzer. A tooth movement diagnostic device has been proposed which is characterized by displaying the analyzed results on a display, but the purpose of this invention is to obtain a simple and easy-to-handle probe for use in the device. It is something to do.

As shown in Figure 1, this invention holds a piezoelectric element P and a Bikini probe in a case (3) K using an elastic material, and then applies an impulse shock to the probe (1). The piezoelectric element is equipped with a round-shaped driving part to transmit the static pressure applied to the tooth through the probe (1) and the vibration pressure generated on the tooth due to the impulse impact seen on the tooth. convert to voltage,
Furthermore, the main feature is that it has a function of applying an impulse impact to the tooth via the probe (1).

The probe constructed as described above is applied to the tooth movement diagnostic eccentricity having the outline shown in Fig. 1. The output of the piezoelectric element P of the 0 probe (to) is input to the static pressure detection circuit (E), which will be briefly explained below with reference to Fig. 1. ) A confirmation signal 81 is output when the static pressure when the tip of the tooth λ is pressed against the tooth λ to be diagnosed differs from a certain value.

The output of the static pressure detection circuit So is input to the drive current generation circuit (to), and the output of the mosquito drive current generation circuit to is input to the drive section (5) of the probe (to). When the static pressure detection circuit sends the confirmation signal 81, a drive current is output from the drive current generation circuit member to the drive section (5) of the probe, and the tooth to be diagnosed undergoes an AK Beynrus impact via the probe (1). It gives.

The output of the piezoelectric element P is input to the frequency analyzer, and the scissors analyzer also displays a! Zeng is connected. At the same time as the confirmation signal 81 is generated, the frequency analyzer enters the set state, and as described above, the vibration generated in the tooth λ by the impulse impact applied to the tooth AK is frequency-analyzed and displayed on the display 61)Kll. The diagnostician determines the degree of tooth movement based on whether the vibration frequency of the tooth displayed in this manner contains many components with high vibration frequencies or many components with low vibration frequencies.

Stripes! Figures 8 and 4 show embodiments of the probe according to the present invention.

The invention of the bottle uses a probe (1) that performs the above functions and plays a central role in rounding. The probe (1) is a rod body (2) with four percussion tips attached to the tip of the rod body (2).
) between the armpit body (2) and the vibration tip 4.
-It is something that has been inserted. Various methods can be considered for attaching the 8 pieces of the rod body (2) and the piezoelectric element P1 vibration chip (2). 2 to 4 show a configuration in which the rod main body (2) is screwed with the K striking tip 4. In other words, as a reliable means for making the rod body (2) more durable, The male screw of the vibration tip (2) is screwed into the female screw (9), and a piezoelectric element P is inserted into the connection between the two, which has a hole large enough for the pigeon screw of the vibration tip (4) to loosely pass through. ing.

Also, in Figure 1lE7, there is a swing tip @t against the rod body @.
- Nine embodiments were shown in which the lid was screwed on.

Since this probe (1) has the function of an acceleration sensor when detecting tooth vibration, it is necessary to accurately extract the vibration of the oscillator, that is, the tooth, and it is lightweight compared to the weight of the tooth. A titanium-based light alloy is preferable, and in this example, a straight 1i 7 wa cylindrical material made of boria heptal resin and Sheracore XJt Delrin is used.In particular, the vibration tip at the tip is For (2), it is sufficient to have the function of transmitting the above-mentioned impulses and tooth vibrations, so it is necessary to reduce the weight as much as possible in terms of material and shape.Therefore, the examples shown in Figs. 2 to 114 Now, the tapered end is a nine-stroke tip (2)
is used. In order to convert tooth vibration into voltage more efficiently, the characteristic impedance of the piezoelectric element P should be close to that of the rod (2), and the piezoelectric element P should have a high piezoelectric index with respect to the force in the longitudinal direction of the rod (2). Use number 4.

The probe (1) is supported by a case (3) using an elastic material (4). In this way, the tooth vibration will be transmitted to the rod body of the probe (1) efficiently. It is preferable to use a material so as not to increase the effective mass of the probe (1). Furthermore, the elastic material used for and ζ (
It is better to select the highest possible compliance for 4). That is, this is to prevent resonance with tooth vibration from occurring in this holding portion.

Figure 8 shows the case where a tit spring is used as an elastic material. Front of driving magnet wheel and probe (1)
Another spring spring (4) is inserted between the rear end and the rear end to obtain an appropriate pressing force against the teeth.

The probe (1) is shaped so that an impulse impact is applied to the tooth by the wa portion (6)K. Basically, the configuration is such that electrical-mechanical conversion is performed by passing a drive current output from a drive current generation circuit to the whirling drive coil (■), and various commonly used embodiments can be applied. It gets thicker. 2nd #A.

In the case shown in Fig. 118, the electromagnetic force from the drive boiling wheel is directly transmitted to the am probe (1), and there is a cylindrical member (
-) is attached to a plated cylindrical member i) K drive coil - a drive magnet loosely fitted into the Dt wound case (the cylindrical member 6 mentioned above on the rear end wall of the ship). A magnetic strip covering the coil is attached to the case-side pole of the drive magnet (2) so that the magnetic field formed by the drive magnet forms a strong parallel magnetic field M around the coil.

When the drive unit (6) is configured in this way and an impulse current is passed through the drive coil 6] from the drive current generation circuit (see Figure 1), the probe will move due to the repulsion or attraction force from the strong parallel magnetic field M. An impulse impact is applied to the tooth via (1).

In the embodiment shown in Fig. 21g4, the mechanical force generated by the electromagnetic force described above is applied to a weight ball at the tip of a spring spring l1.
14 and is pushed out by the spring spring group, which generates an impulse impact by colliding with the rear end of the probe (1). The case (8) K is supported on the rear side of the probe (1) using an elastic material. In this case, the weight edge is positioned slightly behind the probe (1), and the armpit weight is placed so that when the cough weight ball is pushed out by the spring, it collides accurately with the rear end of the probe. Sliding tube into which the ball fits loosely
It is stored. Plunger case (3) K]l
The attached air core drive coil 5 passes through the air core part^, and its diameter is made thicker at the front of the air core part than at the rear of the air core part. When the drive section (M) has this IIIK configuration and a drive current is passed through the drive filter (2) for a certain period of time, the operation shown in FIG. 6 is exhibited.

The sixth panel shows the movement of the probe (1) and the drive unit (5) over time (Xun is the probe L (B) is the drive unit 5C), and the plunger of the drive unit is shown. This is a graph of the movement of the weight edge.Up to time 1-1, there is an initial state in which there is no driving current output from the external driving current generating circuit. Next, the probe (1) is pressed against the tooth to be diagnosed with a constant pressure, and when the static pressure detection circuit determines that the pressure is not at a constant value, a driving current is output in accordance with the confirmation signal issued during the movement.Time 1
This is the state shown in -1-. At this time, the plunger is attracted by the drive coil and stores energy in the spring t4. In this way, the energy accumulated in the spring spring MK pushes the weighted edge forward and causes it to collide with the probe (1) at @Ct-t. At this time, the most effective way is to cause the above collision just before the spring spring is fully extended, so it is necessary to adjust the distance between the weight edge and the rear end of the probe (1) in advance. be. The fully extended spring gradually contracts, and when the driving current is cut off at tmt, when it returns to its initial position, the plunger returns to its initial position, and after completing one factory cycle, it is completed.
Become.

The drive body shown in Figs. 2 and 8 has the advantage of having a relatively small number of parts, but the drive coil
It acts as an inductance with respect to IK, and has the disadvantage that even if the impulse current itself is instantaneous, the impact given to probe (1)K is not instantaneous. On the other hand 111411
Configuring the @ifc drive unit shown in Fig. 8 requires more parts, but it has the advantage of being able to apply a sudden shock to the probe (1). (B) and (G) are various examples of the shape of the tip of the percussion tip (2) at the tip of the probe (1). If the teeth are in the shape of -, the diagnosis is made by pressing a hammer against the buccal side of the tooth to be diagnosed. Diagnosis can be performed by making the tip bifurcated as shown in I!l (b), and by pressing or pulling pressure in both directions, sb, and as shown in (e) If the tip is hook-shaped, it is possible to diagnose by pressure.1.If the tip is used properly depending on the situation, effective diagnosis can be made.

However, when the drive unit (6) of the embodiment shown in fllt4aK is used, the difference is that the vibration tip (2) with a hook-shaped tip as shown in FIG. 6(e) is used.

Figure 818 is a schematic drawing of the present invention being pressed against the patient's teeth. The probe (1) has a mass Ml of a compliance member yxc and is connected to the tooth tomb via a viscous resistance R1, and the probe (1) has a mass Ml of a bar material (compliance C1) and an elastic material (4). It is connected to the case (3) via the compliance C1 of the probe (1) and Probe (υ) and case (3) (mass M
s and compliance Cm) at the resonant frequency.

Therefore, in this invention, the rod (!) is made of as hard a material as possible, the resonant frequency of the probe (1) itself is set as high as possible than the resonant frequency band of the tooth (101 ohm), and the material is made of elastic material. The compliance C of the material (4) is made as high as possible to make the resonant frequency of the probe (1) and the elastic material (4) much lower than the tooth resonant frequency band.

As explained above, this invention can be applied to a tooth movement degree diagnostic device.The effect is that the degree of tooth movement can be objectively fixed by simply holding the probe in the hand and pressing the probe against the tooth being examined. have.

jEKI1111al1 As shown in the diagram, when a drive coil and a drive magnet are used as the drive unit, it has other uses as described below. In other words, the probe of this probe is pressed against the tooth with a constant pressure, a current of a specific frequency is passed through the drive coil, and the superpower of the piezoelectric element is measured.Thus, the tooth impedance at a specific frequency is detected. That's what I do. This impedance can also be used as a guide for measuring the degree of tooth movement.

In the case shown in Marugame 411, when a heavy ball pushed out by a spring coil is used as the driving part, an extremely sudden impulse blow can be applied to the probe by the heavy ball. I can do it.

t A simple explanation of SW flit! An embodiment of the present invention is shown in FIG.
5116 is an explanatory diagram of the operation when the embodiment shown in FIG. 4 is used. Fig. 6 shows various embodiments of the percussion tip, Fig. 7 shows another embodiment of the probe, and Fig. 1118 shows the peak delta of the present invention when pressed against a tooth. It's a diagram.

In the figure (1)... probe, (ri... rod, ■)
... Rod body, (2) ... Vibration tip, <4
1)...Case, (4)...Elastic material, (
5)...Driver, Zeng...Spring coil, -...Mass sphere, ^...Tooth, P...
·Piezoelectric element.

611th Figure 7 8th II

Claims (9)

[Claims] (1) A detector used in a tooth movement diagnostic device that converts mechanical vibrations generated in teeth into electrical vibrations by applying an impulse impact to the teeth, and determines the tooth movement degree by analyzing the frequency of the electrical vibrations. In the probe, the probe, in which the piezoelectric element is entirely interposed at the tip of the rod, is held in the case using an elastic material with the tip protruding from the opening at the end of the case, and the probe is Probe-0 of a tooth movement diagnostic device characterized by a drive unit for applying an impulse shock to the feeler. (2) A patent claim in which the rod is composed of a rod body and a vibration tip attached to the tip thereof, a piezoelectric element is sandwiched between the rod body and the vibration tip, and nine probes are used. Range III & 1
The probe of the tooth movement degree diagnostic device described in 2. (3) A probe of a tooth movement degree diagnosing device according to claim FS2, which uses a tapered vibration tip. (4) A probe for the tooth movement diagnostic device according to claim 8 using a nine-stroke tip with an L-shaped tip. (5) A probe for a tooth movement degree diagnosing device according to claim 2, which uses a percussion tip with a hook-shaped tip. (6) Claim III using a striking tip with a bifurcated tip! 1llf A probe for the tooth movement degree diagnostic device according to item 2. (7) A probe for a tooth movement degree diagnosing device according to claim 1, which uses a drive section that generates an impulse impact by directly transmitting mechanical force generated by electromagnetic force to the probe. (8) After the mechanical force generated by the electromagnetic force is stored in a spring coil with a weighted ball attached to the tip, the weighted ball is made to collide with the rear end of the probe using the extension force of the cough spring pull to generate an invulsion lIs. A probe of a tooth movement degree diagnosing device according to claim 1, which transmits information to a probe. (9) A probe for a tooth movement degree diagnostic device according to claim 1yLK, wherein the mass of the probe is equal to or less than that of a tooth.