JP4668777B2 - Occlusal force measuring device - Google Patents

Occlusal force measuring device Download PDF

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JP4668777B2
JP4668777B2 JP2005351102A JP2005351102A JP4668777B2 JP 4668777 B2 JP4668777 B2 JP 4668777B2 JP 2005351102 A JP2005351102 A JP 2005351102A JP 2005351102 A JP2005351102 A JP 2005351102A JP 4668777 B2 JP4668777 B2 JP 4668777B2
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occlusal force
pressure sensor
thin film
measuring device
occlusal
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JP2007151819A (en
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直広 上野
修 福田
守人 秋山
昭宏 眞竹
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National Institute of Advanced Industrial Science and Technology AIST
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Description

咬合力を測定する咬合力測定装置に関し、更に詳しくは被験者の咬合力を簡単に且つ正確に測定できる咬合力測定装置に関する。   More particularly, the present invention relates to an occlusal force measuring apparatus that can easily and accurately measure an occlusal force of a subject.

咬合力の測定評価は歯科治療の評価、疾病の予防、小児の顎の発達の評価などに用いられる。
従来、咬合力を測定する方法として、歯の咬合に使用される筋肉に光を照射して得られた散乱光からこの筋肉の酸素飽和度を計算し、予め計測しておいた酸素飽和度と咬合力との相関関係データに基づいて被験者の咬合力を推定する方法がある（特許文献１参照）。 The bite force measurement evaluation is used for evaluation of dental treatment, prevention of disease, evaluation of child's jaw development, and the like.
Conventionally, as a method of measuring the occlusal force, the oxygen saturation of this muscle is calculated from the scattered light obtained by irradiating light to the muscle used for tooth occlusion, and the previously measured oxygen saturation and There is a method of estimating a subject's occlusal force based on correlation data with the occlusal force (see Patent Document 1).

また、咬合力検出部に加えた圧力（咬合力）を、圧力媒体液を介して圧力検出器に送り、圧力を測定するような直接的に咬合力を測定する装置がある（特許文献２参照）。
また、直接的に咬合力を測定する別の方法として、プラスチックフィルム製の基板上にプリント配線を形成し、該配線上に圧力センサを配置した測定装置がある（特許文献３参照）。
この測定装置の特徴は、咬合力検出部の厚さが薄くなっている点である。
特開２００２−８５４３２号公報 特開平９−６６０４８号公報 特開平５−２７７１３６号公報 In addition, there is a device that directly measures the occlusal force, such as sending pressure (occlusal force) applied to the occlusal force detector to the pressure detector via the pressure medium liquid (see Patent Document 2). ).
As another method for directly measuring the occlusal force, there is a measuring device in which a printed wiring is formed on a plastic film substrate and a pressure sensor is disposed on the wiring (see Patent Document 3).
The feature of this measuring device is that the thickness of the occlusal force detection unit is thin.
JP 2002-85432 A JP-A-9-66048 JP-A-5-277136

しかし、例えば特許文献１に記載されているような間接的に測定する方法の場合、酸素飽和度と咬合力との相関関係データは被験者毎に異なる。
そのため、咬合力の測定を行おうとする度に予め被験者一人一人の酸素飽和度と咬合力との相関関係データを作成しておく必要があり、手間と時間を余分に要する。 However, in the case of the method of indirect measurement as described in Patent Document 1, for example, the correlation data between the oxygen saturation and the occlusal force is different for each subject.
Therefore, it is necessary to create correlation data between the oxygen saturation of each subject and the occlusal force in advance every time the occlusal force is measured, which requires time and labor.

一方、特許文献２に記載されているような直接的に測定する装置の場合、直接被験者の咬合力を測定するので事前に被験者毎のデータを収集する必要が無く、容易に測定することができる。
しかし、被験者に咬ませる部分である咬合力検出部に一定の大きさの機械的な構造を必要とするため、咬合力検出部が厚くなり（約６〜１２ｍｍ）特に小児の場合には咬合の状態に大きく影響を与え正確な測定を困難にする。 On the other hand, in the case of a device that directly measures as described in Patent Document 2, since the subject's occlusal force is directly measured, it is not necessary to collect data for each subject in advance, and it can be easily measured. .
However, since the occlusal force detection unit, which is a part to be bitten by the subject, requires a mechanical structure of a certain size, the occlusal force detection unit becomes thick (about 6 to 12 mm), especially in the case of children. It greatly affects the condition and makes accurate measurement difficult.

特許文献３に記載されている測定装置の咬合力検出部は、厚さは薄いが、そのことが原因で測定時に被験者が咬むと撓み易く、咬合力検出部に曲げモーメントが発生する。
その結果、該曲げモーメントによっても電圧が発生し、それがノイズとなり正確な咬合力の測定ができない欠点がある。 The occlusal force detection unit of the measuring apparatus described in Patent Document 3 is thin, but because of this, when the subject bites at the time of measurement, it tends to bend, and a bending moment is generated in the occlusal force detection unit.
As a result, a voltage is also generated by the bending moment, which becomes a noise and cannot accurately measure the occlusal force.

また、従来の咬合力測定装置に用いられている圧力センサは、その種類によってダイナミックレンジが固定されてしまう。
その結果、被験者に応じて予め概略的に咬合力を予測し、適当な圧力センサを用いなければ正確に測定することができない。
更にまた、従来の咬合力測定装置では、咬合力検出部内の機械構造を保護するために、咬合力検出部全体をシェル構造にしている。
しかし、シェル構造は咬合力を効率よく圧力センサに伝達することができないため、咬合力を加えても圧力センサが反応しない力の範囲、いわゆる不感帯が発生する。 Further, the dynamic range of the pressure sensor used in the conventional occlusal force measuring device is fixed depending on the type of pressure sensor.
As a result, it is impossible to accurately measure the occlusal force roughly in advance according to the subject and using an appropriate pressure sensor.
Furthermore, in the conventional occlusal force measuring apparatus, the entire occlusal force detection unit has a shell structure in order to protect the mechanical structure in the occlusal force detection unit.
However, since the shell structure cannot efficiently transmit the occlusal force to the pressure sensor, a range of force in which the pressure sensor does not react even when the occlusal force is applied, a so-called dead zone occurs.

本発明は以上のような課題背景をもとになされたものである。
即ち、本発明は被験者の咬合力を簡単且つ正確に測定でき、薄型の不感帯が存在しない咬合力測定装置を提供することを目的とする。 The present invention has been made based on the background of the problems as described above.
That is, an object of the present invention is to provide an occlusal force measuring device that can easily and accurately measure a subject's occlusal force and does not have a thin dead zone.

本発明者は上記のような技術的背景を鑑み、鋭意研究を重ねた結果、咬合力検出部の表裏に薄膜状圧電体を配置することで、曲げモーメントによるノイズの影響を除去できることを見出し、その知見に基づいて本発明を完成させたものである。   In view of the technical background as described above, the inventor has conducted extensive research, and as a result, by arranging a thin film piezoelectric body on the front and back of the occlusal force detector, it has been found that the influence of noise due to bending moment can be removed, The present invention has been completed based on the findings.

すなわち本発明は、（１）咬合力を測定する装置であって、その構成部である咬合力検出部が平面状部材の表裏に薄膜状圧電体を用いた圧力センサを相対向させて配置してなる咬合力測定装置に存する。   That is, the present invention is (1) an apparatus for measuring an occlusal force, wherein the occlusal force detection unit, which is a component thereof, is arranged with pressure sensors using thin film piezoelectric elements facing each other on the front and back of a planar member. The occlusal force measuring device.

また本発明は、（２）、薄膜状圧電体が窒化アルミニウム、酸化亜鉛、又はポリフッ化ビニリデンである上記（１）記載の咬合力測定装置に存する。   Moreover, this invention exists in the biting force measuring apparatus of the said (1) description whose (2) thin film-shaped piezoelectric material is aluminum nitride, zinc oxide, or polyvinylidene fluoride.

また本発明は、（３）、薄膜状圧電体が窒化アルミニウムである上記（１）記載の咬合力測定装置に存する。   The present invention also resides in (3) the occlusal force measuring device according to (1), wherein the thin film piezoelectric body is aluminum nitride.

また本発明は、（４）、咬合力検出部の厚さが１．０mm以下である上記（１）記載の咬合力測定装置に存する。   The present invention also resides in (4) the occlusal force measuring device according to (1), wherein the thickness of the occlusal force detector is 1.0 mm or less.

また本発明は、（５）、上記圧力センサが薄膜状圧電体、二層の電極層及び絶縁層の４層で構成され、該圧力センサを折り畳んでなる上記（１）記載の咬合力測定装置に存する。   Further, the present invention provides (5) the occlusal force measuring device according to (1), wherein the pressure sensor is composed of four layers of a thin film piezoelectric body, two electrode layers and an insulating layer, and the pressure sensor is folded. Exist.

また本発明は、（６）、平面状部材の材質がエラストマー、合成ゴム、又はシリコンゴムである上記（１）記載の咬合力測定装置に存する。   The present invention also resides in (6) the occlusal force measuring device according to (1), wherein the material of the planar member is elastomer, synthetic rubber, or silicon rubber.

なお本発明の目的に添ったものであれば上記発明を適宜組み合わせた構成も採用可能である。   In addition, as long as the objective of this invention is met, the structure which combined the said invention suitably is also employable.

本発明は咬合力検出部を平面状部材の表裏に圧力センサを相対向させて配置する構造とすることで、被験者が咬合力検出部を噛んだ時に生じるノイズ（圧力センサに曲げモーメントが加わることで発生する余計な電圧）の影響を排し、より正確な咬合力を測定することが可能になる。
また、圧力センサに対し、薄膜状圧電体を用いることで咬合力検出部の厚さを被験者が無理なく噛める厚さ（例えば約１．０ｍｍ以下）にすることができる。
その結果、被験者の咬合力を正確に測定することが可能になる。
また、咬合力検出部は機械的な構造を有さず、咬合力を直接薄膜状圧電体に作用させて咬合力を測定する。 The present invention has a structure in which the occlusal force detection unit is arranged so that the pressure sensors are opposed to each other on the front and back of the planar member, so that noise generated when the subject bites the occlusal force detection unit (a bending moment is applied to the pressure sensor) It is possible to measure the occlusal force more accurately, eliminating the influence of the extra voltage generated by
In addition, the thickness of the occlusal force detection unit can be set to a thickness (for example, about 1.0 mm or less) that the subject can comfortably bite by using a thin film piezoelectric body for the pressure sensor.
As a result, it becomes possible to accurately measure the biting force of the subject.
Further, the occlusal force detection unit does not have a mechanical structure, and measures the occlusal force by applying the occlusal force directly to the thin film piezoelectric body.

このような測定方法を採用することで、咬合力検出部をシェル構造にする必要がなくなり、不感帯が発生せず、精密な咬合力を検出することができる。
また、圧力センサには薄膜状圧電体を用いているので、圧力センサのダイナミックレンジが固定されず、感度の調節をアンプのみで行えるため、そのセンサのみで幅広い咬合力の大きさを高精度で測定することが可能になる。
また従来の筋肉に光を照射して咬合力を間接的に測定する場合と異なり、直接咬合力を測定するので被験者個々のデータを測定前に予め収集する必要が無い。 By adopting such a measurement method, the occlusal force detection unit does not need to have a shell structure, a dead zone does not occur, and a precise occlusal force can be detected.
In addition, since the pressure sensor uses a thin film piezoelectric body, the dynamic range of the pressure sensor is not fixed, and the sensitivity can be adjusted only with an amplifier. It becomes possible to measure.
Further, unlike the case where the occlusal force is indirectly measured by irradiating light to the conventional muscle, the occlusal force is directly measured, so that it is not necessary to collect data on each subject before measurement.

〔実施形態〕
以下、図面を用いて本発明の実施形態について説明する。
最初に本発明の咬合力測定装置の構成について説明する。
図１は本発明の咬合力測定装置を概略的に説明するための平面概略図である。
本発明は、薄膜状圧電体を二層の電極層で挟み込み一体化した図示しない圧力センサ１と圧力センサ２、これらの圧力センサを固定するための平面状部材３、圧力センサに発生した電圧から咬合力を計算する電圧検出部４、及び加わった咬合力を表示する測定値表示部５とよりなる。
そして咬合力検出部Ａは平面状部材３の表裏に圧力センサ１及び圧力センサ２を相対向させて配置させている。 Embodiment
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the configuration of the occlusal force measuring device of the present invention will be described.
FIG. 1 is a schematic plan view for schematically explaining the occlusal force measuring apparatus of the present invention.
The present invention includes a pressure sensor 1 and a pressure sensor 2 (not shown) in which a thin film piezoelectric body is sandwiched and integrated between two electrode layers, a planar member 3 for fixing these pressure sensors, and a voltage generated in the pressure sensor. The voltage detection unit 4 calculates the occlusal force, and the measurement value display unit 5 displays the applied occlusal force.
The occlusal force detection unit A is arranged with the pressure sensor 1 and the pressure sensor 2 facing each other on the front and back of the planar member 3.

次に圧力センサの構造について説明する。
圧力センサ１及び圧力センサ２の基本構造は薄膜状圧電体６を二層の電極層７で挟み込んだものであるが、電極層の短絡を防止するために絶縁層８をその構成の一部に加えることが好ましい。 Next, the structure of the pressure sensor will be described.
The basic structure of the pressure sensor 1 and the pressure sensor 2 is such that a thin film piezoelectric body 6 is sandwiched between two electrode layers 7, but an insulating layer 8 is part of the configuration in order to prevent a short circuit of the electrode layers. It is preferable to add.

その絶縁層８を加えた圧力センサの例を図２に示す。
薄膜状圧電体６の表面に絶縁層８を形成し、一体化したものを電極層７Ａ及び電極層７Ｂで挟み込んだ構造である。
圧力センサをこのような構造とすることで、圧電体の薄膜化に伴う電極層７Ａと電極層７Ｂ間の短絡を防止することができる。
また、図３に示すように、図２の圧力センサを幅方向に沿って複数回折り畳む構造（図では一回折り畳む構造を示す）も可能である。
外側の電極層７Ｂを接地電位に接続することで、外側の電極層７Ｂが薄膜状圧電体６を電磁的にシールドする。
その結果、外部のノイズを遮断し、正確な圧力を測定することが可能となる。 An example of a pressure sensor to which the insulating layer 8 is added is shown in FIG.
In this structure, the insulating layer 8 is formed on the surface of the thin film piezoelectric body 6 and the integrated layer is sandwiched between the electrode layer 7A and the electrode layer 7B.
With the pressure sensor having such a structure, it is possible to prevent a short circuit between the electrode layer 7A and the electrode layer 7B due to the thinning of the piezoelectric body.
Further, as shown in FIG. 3, a structure in which the pressure sensor of FIG. 2 is folded a plurality of times along the width direction (a structure in which the pressure sensor is folded once) is also possible.
By connecting the outer electrode layer 7B to the ground potential, the outer electrode layer 7B electromagnetically shields the thin film piezoelectric body 6.
As a result, external noise can be blocked and an accurate pressure can be measured.

ここで、圧力センサにおける絶縁層の材質は特に限定されるものではないが、可撓性があり、軽量で、取り扱い易い特徴を有するプラスチックフィルムが好ましい。
特に耐熱性、絶縁破壊強度、機械的強度等に優れるポリイミド系のフィルムがより好ましい。
また、電極層の材質は特に限定されるものではないが、例えばＡｌ、Ｎｉ、Ｐｔ、Ａｕ、Ａｇ、Ｃｕ等の金属や合金の導電材料、又は金属酸化物や金属窒化物の導電材料を用いることができる。
また、薄膜状圧電体の種類は限定されないが、薄膜であっても感度が高い窒化アルミニウム、酸化亜鉛、ポリフッ化ビニリデン等を使うことが好ましい。
特に窒化アルミニウムは耐食性や化学的安定性に優れ、且つ加工の際も比較的簡単に薄膜状に形成することが可能である。 Here, the material of the insulating layer in the pressure sensor is not particularly limited, but a plastic film that is flexible, lightweight, and easy to handle is preferable.
In particular, a polyimide film having excellent heat resistance, dielectric breakdown strength, mechanical strength, and the like is more preferable.
The material of the electrode layer is not particularly limited. For example, a conductive material of metal or alloy such as Al, Ni, Pt, Au, Ag, or Cu, or a conductive material of metal oxide or metal nitride is used. be able to.
The type of the thin film piezoelectric body is not limited, but it is preferable to use aluminum nitride, zinc oxide, polyvinylidene fluoride, or the like that has high sensitivity even if it is a thin film.
In particular, aluminum nitride is excellent in corrosion resistance and chemical stability, and can be formed into a thin film relatively easily during processing.

そして、平面状部材の材質は支持力を担保出来る限り、特に限定されるものではないが、咬合力検出部は薄く、且つ軽いことが好ましいので、例えば硬質プラスチック、エストマー、合成ゴム、シリコンゴム等が適している。
しかし薄い状態であってもある程度の弾性を有し、被験者が咬んで咬合力検出部が湾曲した場合に折れないことが条件となり、例えば、エラストマー、合成ゴム、シリコンゴム等が適している。 The material of the planar member is not particularly limited as long as the supporting force can be ensured, but the occlusal force detection unit is preferably thin and light, for example, hard plastic, elastomer, synthetic rubber, silicon rubber, etc. Is suitable.
However, even if it is in a thin state, it has a certain degree of elasticity, and it is a condition that it does not break when the subject bites and the occlusal force detecting portion is bent. For example, elastomer, synthetic rubber, silicon rubber, etc. are suitable.

ところで、測定する際に、幼児を含む被験者が無理なく咬合力検出部を噛めることや圧力感知性の観点から、二つの圧力センサと平面状部材の合計の厚さは１．０ｍｍ以下であることが好ましい。
咬合力検出部と圧力センサに発生した電圧を咬合力に換算する電圧検出部４と、その換算した咬合力を外部に表示する測定値表示部５を常法により接続する。
ここで、電圧検出部４と測定値表示部５は咬合力測定装置内に配置しても良く、また咬合力測定装置の外部に配置しても良い。 By the way, in the measurement, the total thickness of the two pressure sensors and the planar member is 1.0 mm or less from the viewpoint that the subject including the infant can bite the occlusal force detection part without difficulty and pressure sensitivity. Is preferred.
The occlusal force detector and the voltage detector 4 that converts the voltage generated in the pressure sensor into an occlusal force and the measured value display unit 5 that displays the converted occlusal force to the outside are connected by a conventional method.
Here, the voltage detection unit 4 and the measurement value display unit 5 may be arranged in the occlusal force measuring device or may be arranged outside the occlusal force measuring device.

次に本発明における咬合力の測定原理について説明する。
被験者が咬合力検出部を咬むことで圧力センサ１，圧力センサ２には、上下方向から咬合力Ｆが与えられ、また同時に咬合力Ｆによって咬合力検出部は曲げられ、曲げモーメントＭが圧力センサに与えられる。
その結果、図４のような形に変形する。 Next, the measurement principle of the occlusal force in the present invention will be described.
When the subject bites the occlusal force detection unit, the occlusal force F is applied to the pressure sensor 1 and the pressure sensor 2 from above and below, and at the same time, the occlusal force detection unit is bent by the occlusal force F, and the bending moment M is detected by the pressure sensor. Given to.
As a result, the shape is deformed as shown in FIG.

圧力センサ１、圧力センサ２に加わる曲げモーメントは、大きさは等しいが曲げの方向が逆であるので、曲げモーメントにより発生した電圧は、符合が逆で大きさが等しくなる。
即ち発生電圧は以下の式で表される。
Ｖ１= ＡＰＦ＋ＡｍＭ（式１）
Ｖ２= ＡＰＦ−ＡｍＭ（式２）
Ｖ1 ：圧力センサ１から測定される電圧( Ｖ)
Ｖ2 ：圧力センサ２から測定される電圧( Ｖ)
ＡＰ：比例係数
Ｆ：咬合力( Ｎ)
Ａｍ：比例係数
Ｍ：曲げモーメント( Ｎ)
上記二つの式を変形するとＦ及びＭは以下の式で表される。
Ｆ＝( Ｖ１＋Ｖ２)/２ＡＰ（式３）
Ｍ＝( Ｖ１−Ｖ２)/２Ａｍ（式４）
この計算を電圧計測装置に行わせることで曲げモーメントＭの影響を排除した正確な咬合力を測定することができる。
なお、ＡＰ、Ａｍの比例係数は圧電体に固有の値である。 Since the bending moments applied to the pressure sensor 1 and the pressure sensor 2 are equal in magnitude, but the direction of bending is reversed, the voltages generated by the bending moment are opposite in sign but equal in magnitude.
That is, the generated voltage is expressed by the following equation.
V 1 = AP F + A m M (Formula 1)
V 2 = A P F-A m M ( Equation 2)
V 1 : Voltage measured from the pressure sensor 1 (V)
V 2 : Voltage measured from the pressure sensor 2 (V)
A P : Proportional coefficient F: Occlusal force (N)
Am : Proportional coefficient M: Bending moment (N)
When the above two expressions are modified, F and M are expressed by the following expressions.
F = (V 1 + V 2 ) / 2A P ( Equation 3)
M = (V 1 −V 2 ) / 2A m (Formula 4)
By causing the voltage measurement device to perform this calculation, it is possible to measure an accurate occlusal force excluding the influence of the bending moment M.
Incidentally, the proportional coefficient A P, A m is a value specific to the piezoelectric body.

以下に具体的な実施例を示して、本発明を説明するが本発明は以下の実施例に限定されることはない。   The present invention will be described below with reference to specific examples, but the present invention is not limited to the following examples.

〔実施例〕
薄膜状圧電体として用いる厚さ約１．０μｍの窒化アルミニウム薄膜６１を用い、電極層として厚さ約５０ｎｍの銅薄膜７１と１２μｍのアルミニウム薄膜７２用いた。
そして銅薄膜とアルミニウム薄膜間でのショートを防ぐために、厚さ約８．５μｍのポリイミド薄膜９を絶縁層とした。
該ポリイミド薄膜９をアルミニウム薄膜に重ねて接着して一体化させ、圧力センサを作製した。
なお、銅薄膜７１を可能な限り薄くするためにポリイミド薄膜９に蒸着させた。 〔Example〕
An aluminum nitride thin film 61 having a thickness of about 1.0 μm used as a thin film piezoelectric body was used, and a copper thin film 71 having a thickness of about 50 nm and an aluminum thin film 72 having a thickness of 12 μm were used as electrode layers.
In order to prevent a short circuit between the copper thin film and the aluminum thin film, a polyimide thin film 9 having a thickness of about 8.5 μm was used as an insulating layer.
The polyimide thin film 9 was superposed on the aluminum thin film and bonded and integrated to produce a pressure sensor.
In order to make the copper thin film 71 as thin as possible, it was deposited on the polyimide thin film 9.

次に図５に示す通り、該圧力センサの端部を銅薄膜７１が接着している面を内側にして、圧力センサの端部同士が接触しないような箇所で折り曲げた。
そして折り曲げた結果作られた隙間に導線を挿入し、銅薄膜７１に樹脂系接着剤を用いて接着固定した。
導線接着後はシリコン樹脂１０で該隙間を埋め液体が中に混入しないようにした。
一方、もう一本の導線は圧力センサの外側にむき出しになったアルミニウム薄膜７２の任意の位置に同じように樹脂系接着剤を用いて接着固定した。
圧力センサをもう一つ作成し、以上と同様の処理を行った。 Next, as shown in FIG. 5, the end of the pressure sensor was bent at a location where the end of the pressure sensor was not in contact with the surface where the copper thin film 71 was bonded inside.
Then, a conducting wire was inserted into the gap created as a result of bending, and the copper thin film 71 was bonded and fixed using a resin adhesive.
After bonding the conductive wire, the gap was filled with silicon resin 10 so that the liquid was not mixed in.
On the other hand, another conductive wire was similarly fixed to an arbitrary position of the aluminum thin film 72 exposed outside the pressure sensor by using a resin adhesive.
Another pressure sensor was created and processed in the same manner as above.

二つの圧力センサを厚さ約０．３ｍｍのステンレス製の平面状部材３の表裏に樹脂系接着剤で接着固定し、圧力センサを保護するためにシリコンゴムで圧力センサを覆って咬合力検出部を作った。
咬合力検出部の厚さは約１．０ｍｍとなった。
最後に各電極層から導線を電圧検出部４に常法により接続した。 Two pressure sensors are bonded and fixed to the front and back of a stainless steel flat member 3 having a thickness of about 0.3 mm with a resin adhesive, and the pressure sensor is covered with silicon rubber to protect the pressure sensor, and the occlusal force detection unit made.
The thickness of the occlusal force detection part was about 1.0 mm.
Finally, conductive wires from each electrode layer were connected to the voltage detector 4 by a conventional method.

〔実験１〕
（動的圧力実験）
以上により作成した咬合力検出部を使って下記の実験を行い、本発明である咬合力測定装置の性能を証明した。
なお実際の生活において咬合力は食物を咀嚼するときに発生させるものであり、静的な咬合力より動的な咬合力の測定が実際の咬合力評価には向いていることから動的圧力実験を行った。
本発明の咬合力測定装置の咬合力検出部に対し、加圧機を使って上下から挟むようにして正弦波状に変化する応力を加えた。
図６の上段には加えた応力を示し、下段にはその時咬合力検出部の圧力センサが発生させた電荷量を示した。
図７は加えた応力の振幅値と咬合力に対応した出力の振幅値の対応を示す。 [Experiment 1]
(Dynamic pressure experiment)
The following experiment was performed using the occlusal force detection unit created as described above, and the performance of the occlusal force measuring apparatus according to the present invention was proved.
In actual life, the occlusal force is generated when chewing food, and the dynamic occlusal force measurement is more suitable for the actual occlusal force evaluation than the static occlusal force. Went.
To the occlusal force detection part of the occlusal force measuring apparatus of the present invention, a stress changing in a sine wave shape was applied so as to be sandwiched from above and below using a pressurizer.
The upper part of FIG. 6 shows the applied stress, and the lower part shows the amount of charge generated by the pressure sensor of the occlusal force detection unit at that time.
FIG. 7 shows the correspondence between the amplitude value of the applied stress and the amplitude value of the output corresponding to the occlusal force.

〔実験２〕
（咬合力測定実験）
本発明の咬合力測定装置を実際に被験者に使用させ、咬合力の測定を行った。
図８は、本発明の咬合力測定装置によって奥歯における咬合力を測定した結果を示している。
実際の咀嚼運動のようにかみしめを繰り返し、咬合力を時間的に変化させた。
したがって測定結果は絶対値ではなく、変動する咬合力の振幅によって評価した。 [Experiment 2]
(Occlusal force measurement experiment)
The subject actually used the occlusal force measuring apparatus of the present invention, and the occlusal force was measured.
FIG. 8 shows the result of measuring the occlusal force in the back teeth with the occlusal force measuring apparatus of the present invention.
The biting force was changed temporally by repeating chewing like an actual chewing movement.
Therefore, the measurement result was evaluated not by the absolute value but by the amplitude of the changing occlusal force.

〔比較例〕
咬合力測定装置として従来の装置である歯科用咬合力計オクルーザルフォースメータＧＭ１０（株式会社モリタ製）の咬合力検出部を用い、静的な応力を加えてその出力をひずみゲージアンプの出力として測定した。
図９は加えた応力と、咬合力検出部の出力の対応を示す。 [Comparative example]
The conventional occlusal force meter occlusal force meter GM10 (manufactured by Morita Co., Ltd.), an occlusal force detector, is used as an occlusal force measuring device. As measured.
FIG. 9 shows the correspondence between the applied stress and the output of the occlusal force detection unit.

図６から分かるように、本発明の咬合力測定装置は微細な咬合力を検知することが可能であり、曲げモーメントの発生によるノイズを除去し、正確な咬合力の測定を行うことができる。
また図９に示すように、従来の咬合力計測装置は応力を加えてもセンサの出力が発生しない範囲（いわゆる不感帯）が存在する。
一方、図７から分かるように、本発明による咬合力測定装置は、咬合力検出部において咬合力が直接薄膜圧電体に作用するため、不感帯が発生せず、微細な咬合力も容易に検出することができる。 As can be seen from FIG. 6, the occlusal force measuring device of the present invention can detect a fine occlusal force, remove noise due to the generation of a bending moment, and accurately measure the occlusal force.
Further, as shown in FIG. 9, the conventional occlusal force measuring device has a range (so-called dead zone) in which no sensor output is generated even when stress is applied.
On the other hand, as can be seen from FIG. 7, the occlusal force measuring device according to the present invention can detect minute occlusal force easily without generating a dead zone because the occlusal force detecting unit directly acts on the thin film piezoelectric body. Can do.

図１は本発明の咬合力測定装置を説明するための平面概略図である。FIG. 1 is a schematic plan view for explaining an occlusal force measuring apparatus according to the present invention. 図２は、圧力センサに絶縁層を加えた構造を説明する概略図である。FIG. 2 is a schematic diagram illustrating a structure in which an insulating layer is added to the pressure sensor. 図３は、絶縁層を加えた圧力センサを幅方向にそって一回折り畳んだ時の様子を示した図である。FIG. 3 is a diagram showing a state in which the pressure sensor to which the insulating layer is added is folded once along the width direction. 図４は、咬合力検出部に咬合力が加わったときの咬合力検出部の変形の様子を説明する概略図である。FIG. 4 is a schematic diagram illustrating a state of deformation of the occlusal force detector when an occlusal force is applied to the occlusal force detector. 図５は実施例で用いた咬合力検出部の形状を説明する概略図である。FIG. 5 is a schematic diagram illustrating the shape of the occlusal force detection unit used in the example. 図６は実施例における咬合力検出部を加圧した場合の出力の様子を示すグラフである。FIG. 6 is a graph showing an output state when the occlusal force detection unit in the embodiment is pressurized. 図７は実施例における咬合力検出部を加圧した場合の、加えたときの荷重に対応する出力電圧の振幅を示すグラフである。FIG. 7 is a graph showing the amplitude of the output voltage corresponding to the load when the occlusal force detection unit in the embodiment is pressurized. 図８は実施例における咬合力検出部を実際に噛んで、咬合力を測定した結果を示すグラフである。FIG. 8 is a graph showing the result of measuring the occlusal force by actually biting the occlusal force detector in the example. 図９は比較例を加圧した場合の加えた荷重に対応する出力電圧の振幅を示すグラフである。FIG. 9 is a graph showing the amplitude of the output voltage corresponding to the applied load when the comparative example is pressurized.

符号の説明Explanation of symbols

１…圧力センサ
２…圧力センサ
２１…窒化アルミニウム薄膜
３…平面状部材
４…電圧検出部
５…測定値表示部
６…薄膜状圧電体
６１…窒化アルミニウム薄膜
７…電極層
７Ａ…電極層
７Ｂ…電極層
７１…銅薄膜
７２…アルミニウム薄膜
８…絶縁層
９…ポリイミド薄膜
１０…シリコン樹脂
Ａ…咬合力検出部 DESCRIPTION OF SYMBOLS 1 ... Pressure sensor 2 ... Pressure sensor 21 ... Aluminum nitride thin film 3 ... Planar member 4 ... Voltage detection part 5 ... Measurement value display part 6 ... Thin film-like piezoelectric body 61 ... Aluminum nitride thin film 7 ... Electrode layer 7A ... Electrode layer 7B ... Electrode layer 71 ... Copper thin film 72 ... Aluminum thin film 8 ... Insulating layer 9 ... Polyimide thin film 10 ... Silicone resin A ... Occlusal force detector

Claims (6)

咬合力を測定する装置であって、その構成部である咬合力検出部が平面状部材の表裏に薄膜状圧電体を用いた圧力センサを相対向させて配置してなることを特徴とする咬合力測定装置。   A device for measuring an occlusal force, wherein the occlusal force detection unit, which is a component of the occlusal force, has pressure sensors using thin-film piezoelectric elements arranged on opposite sides of a planar member. Force measuring device. 薄膜状圧電体が窒化アルミニウム、酸化亜鉛、又はポリフッ化ビニリデンであることを特徴とする請求項１記載の咬合力測定装置。   2. The occlusal force measuring device according to claim 1, wherein the thin film piezoelectric body is aluminum nitride, zinc oxide, or polyvinylidene fluoride. 薄膜状圧電体が窒化アルミニウムであることを特徴とする請求項２記載の咬合力測定装置。   3. The occlusal force measuring device according to claim 2, wherein the thin film piezoelectric body is aluminum nitride. 咬合力検出部の厚さが１．０mm以下であることを特徴とする請求項１記載の咬合力測定装置。   2. The occlusal force measuring device according to claim 1, wherein the thickness of the occlusal force detecting portion is 1.0 mm or less. 上記圧力センサが薄膜状圧電体、二層の電極層及び絶縁層の４層で構成され、該圧力センサを折り畳んでなることを特徴とする請求項１記載の咬合力測定装置。   2. The occlusal force measuring device according to claim 1, wherein the pressure sensor is composed of four layers of a thin film piezoelectric body, two electrode layers, and an insulating layer, and the pressure sensor is folded. 平面状部材の材質がエラストマー、合成ゴム、又はシリコンゴムであることを特徴とする請求項１記載の咬合力測定装置。   2. The occlusal force measuring device according to claim 1, wherein the material of the planar member is elastomer, synthetic rubber, or silicon rubber.
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