JaLCDOI 10.18926/AMO/31830
フルテキストURL fulltext.pdf
著者 Hareva, David H.| Okada, Hiroki| Kitawaki, Tomoki| Oka, Hisao|
抄録 <p>The authors previously developed a mobile ecological momentary assessment (EMA) system as a real-time data collection device using a mobile phone. In this study, a real-time advice function and real-time reporting function were added to the previous system as a supportive intervention. The improved system was found to work effectively and was applied to several clinical cases, including patients with depressive disorder, dizziness, smoking habit, and bronchial asthma. The average patient compliance rate was high (89%) without the real-time advice and higher (93%) with the advice. The trends in clinical data for patients using a mobile EMA with/without the new function were analyzed for up to several months. In the case of dizziness, an improving trend in its clinical data was observed after applying the real-time advice, and in the case of depressive disorder, a stabilizing trend was observed. The mobile EMA system with the real-time advice function could be useful as a supportive intervention in behavior modification and for motivating patients in self-management of their disease.</p>
キーワード ecological momentary assessment intervention mobile phone real-time advice
Amo Type Original Article
発行日 2009-04
出版物タイトル Acta Medica Okayama
63巻
2号
出版者 Okayama University Medical School
開始ページ 113
終了ページ 120
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
論文のバージョン publisher
査読 有り
PubMed ID 19404343
Web of Science KeyUT 000265457600006
JaLCDOI 10.18926/15179
タイトル(別表記) Requiring factors in structural model of the blood vesselfor the principle analysis of measurement of blood pressure waveform by applanation tonometry.
フルテキストURL 016_1_009_020.pdf
著者 北脇 知己| 岡 久雄|
抄録 生体内の血圧脈波を非侵襲的に計測する手法として,「トノメトリ法」が知られており,近年,この計測手法を用いて得られた血圧脈波波形から,動脈硬化などの循環器系疾患のスクリーニングや予防診断に役立てようという動きが活発である。しかしながら,組織内の血管を圧迫した場合の血管の変形挙動については,十分な解析は行われていない。そこで本研究では,生体中のトノメトリ状態を解析可能な数値解析モデルを構築することを目的とした。この結果, トノメトリ法による血圧脈波計測の原理解析を行うための血管断面構造の応力解析モデルには,以下の要件が求められることが明らかとなった。・センサ部と皮膚表面はそれぞれ独立な要素としてモデル化し,これらの接触部においては摩擦を考慮しなければならない。・応力の定量的な解析を行うためには,素材の非線形的な機械的特性を考慮する必要がある。さらに,実験結果と計算結果を一致させるためには,初期形状を正確にモデル化することが必要であることがわかった。
抄録(別表記) "Applanation tonometry" is well known method as the technique which measures blood pressure waveform in vivo non-invasively. Recently, utilizing for screening and prevention diagnosis of circulatory system diseases such as the arteriosclerosis from the blood pressure waveform gotten by this measurement technique is very actively being investigated. However, the sufficient analysis is not carried out on the deformation behavior of the blood vessel in real human body. Consequently, the purpose of this paper is to construct the analyzable numerical model in respect of the applanation tonometry. As this result, following factors are necessary in the numerical analysis model of cross sectional structure of blood vessel for the principle analysis of the blood pressure waveform measurement for applanation tonometry. 1) Sensor block and skin surface must have the independent structure, and it must consider the friction in the contact area. 2) For the quantitative analysis, it is necessary to consider the hyper-elasticity which is a nonlinear material property. In addition, it is necessary to accurately model the initial shapes of the material.
キーワード トノメトリ法 (Applanation tonometry) 有限要素法 (Finite Element Model) 数値解析モデル (Numerical calculation) 血圧計測 (Blood pressure measurement)
出版物タイトル 岡山大学医学部保健学科紀要
発行日 2005-12-25
16巻
1号
開始ページ 9
終了ページ 20
ISSN 1345-0948
言語 Japanese
論文のバージョン publisher
NAID 120002307172
JaLCDOI 10.18926/15177
タイトル(別表記) Development of intramuscular probe for local muscle function
フルテキストURL 016_1_001_008.pdf
著者 岡 久雄| 枝松 幹也| 渡辺 彰吾| 北脇 知己|
抄録 臨床においては,筋機能や機能不全を診断するために,表面筋電図や針筋電図,筋生検などが行われている。しかし,これらの方法では筋機能や筋収縮メカニズムを連続的に測定することは難しい。本研究では新たに筋内挿入型プローブと測定システムを開発した。測定プローブは光ファイバと6本の白金細線から構成されている。光ファイバを用いて筋の局所血流量と筋内圧力を測定し,6個の電極を用いて運動単位活動電位を測定した。プローブと測定システムの基礎特性を確認した後,麻酔下のラットの排腹筋において,安静時および局所虚血時の活動電位,血流量,筋内圧力を測定した。また脛骨神経を電気刺激し,活動電位波形から伝播速度を算出したところ,プローブは正常に動作していることが確認できた。さらに筋小胞体からのカルシウム放出チャネルを抑制するdantroleneを筋注すると,筋内圧力波形は大きく減少したが,活動電位波形はほとんど変化しないことがわかった。
抄録(別表記) In order to diagnose muscle function or dysfunction, surface/needle electromyograms, muscle biopsy, biochemical markers inspection, muscle tone, etc. are carried out. It is difficult to measure muscle function continuously by using these methods. In this study, an intramuscular probe and measurement system were developed. The probe is composed of optical fibers and six small platinum electrodes. The probe, the tip of which is protected by epoxy resin, is inserted in a cannula of 1.26mm in diameter. By using the fibers, the local blood flow in a muscle and the intramuscular pressure were measured. By using six electrodes (50μm in diameter), a motor unit action potential was measured. The time-course changes of the action potential, blood flow and intramuscular pressure were measured in the gastrocnemius muscle of rats under the resting and the local ischemia. The tibial nerve was stimulated electrically using the current of the unipolar and negative polarity with 50μs pulse duration every 2 seconds and the propagation velocity of the action potential was calculated from the potential waves. The animal tests using rats were carried out in order to verify the developed probe and system. Under the local ischemia, the action potential, the blood flow and the intramuscular pressure decreased and the propagation velocity became slower. When dantrolene sodium was injected, which inhibits the calcium release channel of the sarcoplasmic reticulum, the intramuscular pressure decreased but the action potential wave was still detectable.
キーワード 筋機能 (muscle function) 筋内圧力 (intramuscular pressure) 筋内血流 (intramuscular blood flow) 活動電位 (action potential) 筋収縮 (muscle contraction)
出版物タイトル 岡山大学医学部保健学科紀要
発行日 2005-12-25
16巻
1号
開始ページ 1
終了ページ 8
ISSN 1345-0948
言語 Japanese
論文のバージョン publisher
NAID 120002307295
JaLCDOI 10.18926/15230
タイトル(別表記) マイクロコントローラを組み込んだ歯科インプラント動揺測定装置の開発
フルテキストURL 012_2_107_117.pdf
著者 クスマ ウイジャヤ サストラ| 岡 久雄| 更谷 啓治| 松谷 善雄| 龍田 光弘| 川添 堯彬| 小嶋 英幹|
抄録 The aim of this study was to develop a portable device (IM checker) for measuring dental implant mobility using a microcontroller. A constant amplitude and frequency vibration was applied to a dental implant model and the acceleration signal was detected using measuring probe. Then the IM score was obtained using the criteria developed in this study. We made several implant models of different implant lengths, diameters and material of Rigolac® or Molteno®. There was a linear relationship between mechanical mobility at 400 Hz of the models and the IM scores (R(2) = 0.92). The IM checker could discriminate the mobility of dental implant models in twelve measurements with P < 0.01. There was no significant difference in the means of the IM score measured by four operators with P < 0.01. The results indicated that the IM checker had sufficient reliability and could be available in dental clinics.
抄録(別表記) 本研究の目的は歯科インプラントの動揺を簡易に測定できる装置の開発である。本装置では測定プローブで一定振幅の周波数を歯科インプラントに与え、その加速度信号を検出する。そして本研究で考察した評価基準に基づいてIM値を表示する。さらにRigolac®やMolteno®を用い、インプラント体の長さおよび直径を変えたインプラントモデルを作製した。400Hzにおけるモデルの機械モビリティとIM値との間には、よい相関が見られた(R(2)=0.92)。IMチェッカーを用い、一人の測定者が行った12回の測定において、インプラントの動揺を判別することが可能であった(P<0.01)。また4人の測定者による測定では,その平均値に対し測定者間の有意差は見られなかった(P<0.01)。従ってIMチェッカーは十分な信頼性を有し、歯科臨床に有効であると考える。
キーワード Tooth mobility (歯の動揺) mechanical mobility (機械モビリティ) dental implant (インプラント) manual examination (触診)
出版物タイトル 岡山大学医学部保健学科紀要
発行日 2002-03-20
12巻
2号
開始ページ 107
終了ページ 117
ISSN 1345-0948
言語 English
論文のバージョン publisher
NAID 120002307430
JaLCDOI 10.18926/11709
タイトル(別表記) 歯科インプラント動揺測定装置の開発
フルテキストURL 011_1_025_034.pdf
著者 岡 久雄| 小野 浩一| Wijaya Sastra Kusuma| 更谷 啓治| 川添 堯彬|
抄録 Evaluation of dental implantation is very important because it gives useful information for both planning the dental treatment and evaluating of prognosis. This study aimed at improving our previously developed Tooth Mobility (TM) tester and developing a dental implant movement (IM) checker. The measuring probe included a bimorph transducer of two piezoelectric elements. It was actuated by single frequency and detected tooth acceleration. The acceleration signal was processed and the IM score was calculated in PC. Two artificial implant models in which IMZ implant was buried with different elasticity of surrounding (molteno(@)) were used to examine the performance of the IM checker. The IM scores obtained in the models were 29 and 58. The measurement time was below 15 seconds. The average of measurement variation of one operator was below 6% and the average variation among five operators was below also 6%. The IM checker reduced a measurement variation by 51% and a measuring time by 61% compared with those of the TM tester in natural teeth. The newly developed IM checker had sufficient measuring reliability and we could objectively estimate the implant movement in dental clinics.
抄録(別表記) 臨床歯科において,歯の動揺度診査が日常的に行われているのと同じように,近年行われるようになってきた歯科インプラント施術においても,その植立評価は重要である。歯の動揺は,歯の治療計画において,また予後の評価においても重要な情報を与えてくれる。本研究では,その植立評価を行うために,インプラントの動揺に着目した。動揺を簡便にかつ定量的に測定するために,著者らがすでに開発したT-Mテスタ(Tooth Mobility tester)を改良して,IMチェッカ(Implant Mobility Checker)を開発した。IMチェッカは測定プローブと増幅器などのインタフェース,演算処理用のノートパソコンから構成される。測定プローブは圧電素子を2枚重ねたバイモルフ構造で,単一周波数の振動駆動と加速度検出を行い,口腔内でも測定ができるほどに小型に設計した。ノートパソコンでは得られた加速度信号をデータ処理し,IM値を算出する。IM値は,測定周波数と駆動力が一 定の場合,インプラント周囲の機械モビリティに比例するので,インプラントの動揺を数値化することができる。内可動性機構をもつIMZタイプのインプラントを埋植したモデルを製作し,そのIM値を測定した。インプラント周囲の材料(モルテノ(@))の硬さを変えた2種類のモデルを作製したところ,歯科医による臨床的動揺度診査はいずれもM0であったが,本チェッカによってその動揺の差を測定したところ,IM値は29と58となり,客観的に動揺の差を評価することができた。試作したIMチェッカで測定したところ,一歯の測定時間は約15秒以下であり,また測定のばらつきは術者内で平均6%以下,また術者間で6%以下であった。一方,従来のアナログ型T-Mテスタと比較したところ,天然歯の測定において,測定のばらつきは51%,測定時間は61%減少させることができた。従って,IMチェッカは十分な測定精度を確保できており,今後,臨床での試用を行いたいと考える。
キーワード tooth mobility (歯の動揺) mechanical mobility (機械モビリティ) dental implant (インプラント) manual examination (触診)
出版物タイトル 岡山大学医学部保健学科紀要
発行日 2000-11-16
11巻
1号
開始ページ 25
終了ページ 34
ISSN 1345-0948
言語 English
論文のバージョン publisher
NAID 120002313864
JaLCDOI 10.18926/19666
フルテキストURL Mem_Fac_Eng_OU_33_2_45.pdf
著者 Yamada Nobuya| 岡 久雄|
抄録 It is difficult to evaluate a biomechanical properties quantitatively. The authors developed the measurement system of biomechanical properties formerly but it is on a large scale because of the use of personal computer. In this study, the portable measurement system of biomechanical impedance/mobility is developed. To establish a rapid measurement, a random vibration is adopted in input signal. The system consists of the measuring probe, amplifier, and a note-typed personal computer. The measurement probe is developed newly, and has an overall length of 9 ㎝ (without a handle) and a total weight of about 500 g. The measurement program is also developed and is available to any computer which is worked under MS DOS compatible in Windows 95/98 operating system. The biomechanical spectra of thigh, temple and forehead are obtained and they show three typical spectrum patterns.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1999-04-27
33巻
2号
開始ページ 45
終了ページ 50
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002309193
JaLCDOI 10.18926/19663
フルテキストURL Mem_Fac_Eng_OU_33_2_39.pdf
著者 Yanagi Makoto| 岡 久雄|
抄録 The acousicmyogram (AMG) is a mechanical phenomenon recorded at the surface of an active muscle. It is used to monitor force production, fatigue, and contractile properties of muscle. In this study, the new electrode with accelerometer for electrostimulation and acoustic detection. It consists of Ag-AgCl active electrode and solid-gel annular groud, and a very light piezoresistive accelerometer. The recorded AMG waveform depends on the pulse amplitude and duration of stimulation current and its lag from the electroatimulation is about 7 ms. The strengh-duration (S-D) curve (the threshold current for stimulation vs. pulse duration) describes the excitability of muscle. The left forearm is electrostimulated by using the same electrode and the muscle vibration (AMG) is recorded with accelerometer. During the muscle fatigue, the S-D curve changes and the current threshold increases under the same pulse duration. The rheobase of S-D curve increases gradually but the chronaxie hardly changes during muscle fatigue.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1999-04-27
33巻
2号
開始ページ 39
終了ページ 44
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002309185
JaLCDOI 10.18926/19634
フルテキストURL Mem_Fac_Eng_OU_32_15.pdf
著者 森 政弘| 岡 久雄|
抄録 In a stiffness estimation of living body, an internal structure under the skin influences the measured results. Because a different stiffness of body caused by bones and muscles is obtained. In this paper, by using a measurement system of mechanical impedance, the relations between a viscoelasticity and a distance from the surface of silicone-gel model is calculated. This relation is applied to silicone-gel tumor model and a shape and a viscoelasticity of semi-sphere silicone-gel tumous are estimated. The obtained results are expressed as a reconstructed 3-D image of shape / viscoelasticity. The revised curve-fitting of mechanical impedance and the cancellation of peripheral vibration influence are proposed in order to increase an estimation acccuracy.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1998-04-20
32巻
1-2号
開始ページ 15
終了ページ 22
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002309047
JaLCDOI 10.18926/19591
フルテキストURL Mem_Fac_Eng_OU_31_2_21.pdf
著者 岡 久雄| 中村 貴彦|
抄録 In evaluating the stiffness of skin surface, internal structures such as bone and muscle often affect the measurements. In the present paper, acoustic random vibration is used to estimated the viscoelasticity of a silicone-gel model. This viscoelasticity, which includes two different stiffness strata, is first estimated using a mechanical impedance spectrum, which describes the relation between the depth and viscoelasticity of internal objects. This method is applied to the depth of a silicone-gel tumor model measured by ultrasound imaging and the viscoelasticity of internal gel can be accurately estimated.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1997-03-28
31巻
2号
開始ページ 21
終了ページ 27
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002309105
JaLCDOI 10.18926/19592
フルテキストURL Mem_Fac_Eng_OU_31_2_29.pdf
著者 岡 久雄| 大島 正和|
抄録 Knee replacement arthroplasty is indicated for the patient with advanced knee pain, knee deformation, and knee functional disorder. The aim of this study was to estimate loosening after a knee replacement arthroplasty. Loosening is measured by a frequency response function, and mobility by random vibration. The modal parameters for the knee joint are obtained by applying a modal analysis to the frequency response function. The values decrease as the knee joint prosthesis loosened. These parameters serve as an index for the condition between a thighbone and the prosthesis. The various indexes will greatly clarify the stage of advance in the loosening of knee-joint prostheses.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1997-03-28
31巻
2号
開始ページ 29
終了ページ 37
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002309172
著者 Oka, Hisao|
発行日 1996-11
出版物タイトル Engineering in Medicine and Biology Society
4巻
資料タイプ 学術雑誌論文
JaLCDOI 10.18926/15393
フルテキストURL Mem_Fac_Eng_OU_30_2_15.pdf
著者 岡 久雄| 藤原 史朗|
抄録 An estimation of muscle fatigue is very important study and many laboratory researchers had done actively in this field. The excellent measurement and analysis methods, however, have not established yet. The aim of this study was to investigate the muscle fatigue of low back, caused by sitting on the vehicle seat for a long time. The muscle viscoelasticity and the EMG (Electromyogram) were measured. The authors proposed the objective muscle fatigue index that was obtained from the result of PCA (Principal Component Analysis) by using the measured varlables. The objective muscle fatigue index suggests an adequate correlation with the subjective fatigue on the vehicle seat.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1996-03-29
30巻
2号
開始ページ 15
終了ページ 20
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307965
JaLCDOI 10.18926/15417
フルテキストURL Mem_Fac_Eng_OU_29_2_39.pdf
著者 岡 久雄| 坂本 俊哉| Irie Takashi|
抄録 The body structures under the skin surface, such as bones and tendon, have an influence on the stiffness evaluation observed from the surface. In this case, the observed stiffness should be called an apparent stiffness. To obtain the biomechanical properties of skin itself, the influence of body structure should be removed. This study deals with the correction method of apparent viscoelasticity which calculated from apparent biomechanical impedance. This method is applied to the measured result of the forearm and the right chest to confirm its effectiveness.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1995-03-27
29巻
2号
開始ページ 39
終了ページ 47
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307527
JaLCDOI 10.18926/15415
フルテキストURL Mem_Fac_Eng_OU_29_2_29.pdf
著者 岡 久雄| 福田 敬|
抄録 In the stiffness evaluation from the skin surface, the body structure under the skin, like a bone and muscle, influences on the measurement results. The authors developed the measurement system of biomechanical impedance with applying a vibration of acoustic frequency onto the body surface. We measured the viscoelasticity of the silicone-gel model, which involves metal blocks, from the gel surface by using this system. The internal structure of model is estimated from the relation between the viscoelasticity and the distance from the gel surface to the internal block. Applying this method, the shape of ribs of the right chest are estimated. The shapes and viscoelasticity of silicone-gel tumor model, which has two different tumors, are also estimated.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1995-03-27
29巻
2号
開始ページ 29
終了ページ 37
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307199
JaLCDOI 10.18926/15400
フルテキストURL Mem_Fac_Eng_OU_27_2_11.pdf
著者 岡 久雄| 山本 辰馬| Saratani Keiji| Tanaka Masahiro| Kawazoe Takayoshi|
抄録 The use of dental implants has increased together with increases in the human life span and it has become an imperative subject for dentists to familiarize themselves with this treatment modality. Unfortunately, there has been no practical and quantitative method for in vivo evaluation of the stability of dental implants. In the tooth mobility examination, the tactile sense of natural teeth is different from that of dental implants. The authors have developed an automatic diagnosis system of tooth mobility for clinical use. The biomechanical mobility of peri-implantium is measured with a pseudo-random vibration, from which the viscoelasticity c1, c2, k of peri-implantium is obtained. The diagnosis system has been applied to the quantitative evaluation of the stability of implants : endodontics endosseous implants (titanium pin), endosseous implants (Bioceram). It has also been applied to the evaluation of the long-term prognoses of dental implantation (Bioceram) and the examination of Intramobile implant (IMZ), and the satisfactory results have been obtained.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1993-03-25
27巻
2号
開始ページ 11
終了ページ 17
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308018
著者 Oka, Hisao| Irie, Takashi| Hao, Sun Yong| Yamamoto, Tatsuma|
発行日 1991-5
出版物タイトル Instrumentation and Measurement Technology Conference
資料タイプ 学術雑誌論文
JaLCDOI 10.18926/15495
フルテキストURL Mem_Fac_Eng_OU_24_2_31.pdf
著者 岡 久雄| Isayama Yoshiharu| Nakauchi Makoto| 山本 辰馬|
抄録 A small vibration on the body surface is expected to apply to a clinical examination of the autonomic nervous system. The vibration cannot be found by the naked eyes. It is called a microvibration (MV) or a minor tremor (MT). It is not cleared out why and how the MV occurs, but many papers about its occurrence and clinical application have been published. In this study, the typical spectrum of MV and the various causes of MV occurrence are studied. The relationships of MV with heart rate, muscle contraction and MV are discussed. The power spectrum of MV is obtained by using an autoregressive model.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1990-03-29
24巻
2号
開始ページ 31
終了ページ 40
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307725
JaLCDOI 10.18926/15479
フルテキストURL Mem_Fac_Eng_OU_24_1_73.pdf
著者 岡 久雄| Isayama Yoshiharu| 山本 尚武| 山本 辰馬|
抄録 There is a small vibration which goes undetected by the naked eyes. It is called a microvibration (MV) or a minor tremor (MT). The MV on the body surface is expected to apply to a clinical examination of the autonomic nervous system. It is not cleared why and how the MV occurs, but there are many papers about its occurrence and clinical application. In this study, MV measuring system, its estimation and basic characteristics are examined. The difference between head MV and thenar MV, individual MV and diurnal and seasonal change are discussed. The power spectrum of MV is obtained using an autoregressive model.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1989-11-29
24巻
1号
開始ページ 73
終了ページ 80
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307633
JaLCDOI 10.18926/15476
フルテキストURL Mem_Fac_Eng_OU_24_1_63.pdf
著者 山本 尚武| Isshiki Hiromi| 岡 久雄| 山本 辰馬|
抄録 There is no doubt that many people feel the peace of mind or the pleasures of senses in appreciating music. But the estimation of the effect is very difficult and the objective estimation can be hardly done. This study proposed the objective estimating method of human emotion utilizing galvanic skin reflex (GSR) which reflects a human psychological activity. In this method, not by individual response, but by the series of response and pattern of appearance of GSR, the emotional response under appreciating music was investigated. In the case of appreciation of the same classic music to several subjects, the individual GSR responses are random and remarkable characteristic could not be find on the results. However, on the patterns of appearance of GSR, the patterns obtaining from the same generation are much similar each other and the patterns obtaining from different generation are less similar. It was cleared that the same music gave different effect on different generations.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1989-11-29
24巻
1号
開始ページ 63
終了ページ 72
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307670
JaLCDOI 10.18926/15465
フルテキストURL Mem_Fac_Eng_OU_23_1_49.pdf
著者 岡 久雄| 山本 辰馬| Isayama Yoshiharu|
抄録 In the field of dental study it is most fundamental and necessary to estimate the condition of periodontium. In order to examine a mechanical characteristics of periodontium, the theoretical displacement response to periodontal mechanical model (three elements model) are strictly solved in case of some pulse excitations. Impact excitations (rectangular, triangular and half-cycle sine pulse) are given in physical and mathematical definitions and complete solutions to the impact excitations are provided. The triangular pulse excitation which is obtained by means of a fracture of pencil-lead is most suitable. The mechanical parameters of periodontium are given using this input excitation. This is experimentally confirmed by artificial tooth model. The obtained mechanical characteristic of the periodontal tissues can be applied to clinical diagnosis.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1988-11-22
23巻
1号
開始ページ 49
終了ページ 60
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307622