アブストラクト（19巻4号：神奈川歯学）

神奈川歯学

Japanese

Title　： 抜去歯のモーダル解析
Subtitle　： 原著
Authors　： 白沢勝沖
Authors（kana）　：
Organization　： 神奈川歯科大学補綴学教室第一講座
Journal　： 神奈川歯学
Volume　： 19
Number　： 4
Page　： 325-340
Year/Month　： 1985 / 3
Article　： 原著
Publisher　： 神奈川歯科大学学会
Abstract　： 「緒言」音響や振動の伝達特性を利用して, 上下顎咬合接触状態や歯の健康度などを推測し, 診断の一助にしようとする考えが古くから発表されている. 諸外国では, 聴診器を用いて咬合音を聴覚的にとらえたStewart (1953) を始めとして, 電気的に咬合音をとらえ視覚的表示で分析を行ったWatt (19639 など多くの報告がある. 本邦では杉崎ら (1960) の天然歯列者ならびに義歯装着者の咬合音の周波数分析を行ったのを始めとし, 倉島 (1963), 加藤 (1967), 八島 (1971), 石岡ら (1973), 三島 (1973), 白沢ら (1973), 井上ら (1973), 永田 (1976), 芦沢 (1976), 池田 (1977), 伊藤 (1979), 池田ら (1979), 高宮 (1979), 羽賀ら (1980), 大倉 (1982), 中村 (1983), などによって数多くの報告がなされている.
Practice　： 歯科学
Keywords　：

English

Title　： Modal Analysis of Extracted Teeth
Subtitle　：
Authors　： Katsuoki SHIRASAWA
Authors（kana）　：
Organization　： 1st Department of Prosthetics, Kanagawa Dental College
Journal　： Kanagawa Shigaku
Volume　： 19
Number　： 4
Page　： 325-340
Year/Month　： 1985 / 3
Article　： Original article
Publisher　： Kanagawa Odontological Society
Abstract　： Measurement of the vibratory characteristics of extracted teeth has been carried out using various methods. However, results can differ considerably depending on the method. Determination of these characteristics is important it form starting point for occlusal sound research in the field of dentistry. As an answer to this problem, the author used modal analysis to determine sympathetic vibration frequencies in an extracted tooth. The experimental system consisted of a minishaker, a laser doppler vibrometer (LDV), a 2ch FFT analyzer and a computer. Modal analysis is a method which uses a transfer function of m/sec2/N as basis in determining the vibratory characteristics of the object. The angles of vibration were 90°, 45°, and 0°in relation to the root axis, the area where sympathetic vibration is most likely to occur. Resuts showed peaks of 1525.8 Hz, 1833.6 Hz, 2227.2 Hz and 4264.0 Hz. Results of modal analysis showed the second third peaks to be the sympathetic frequency of the tooth. To summarize results: 1. Modal analysis of the teeth was recognized an an effective procedure in the random noise vibration method. 2. Sympathetic vibration of extracted teeth using modal analysis was found to be 1833.6 Hz and 2227.2 Hz at an angle of 90°. Seen in terms of the Q-value of sympathetic vibration, 2227.2 Hz can be considered a sharper sympathetic vibration. 3. Using the present experimental method, no sympathetic vibration frequency was determined at a vibratory angle of 0°.
Practice　： Dentistry
Keywords　：