アブストラクト(25巻2号:神奈川歯学)

神奈川歯学

Japanese

Title : ヒト乾燥頭蓋ハンマ加振時の線形性, 相反性の検討
Subtitle : 原著
Authors : 熊澤裕子, 関口淳平, 斎藤実, 本間和人, 豊田實, 松尾悦郎
Authors(kana) :
Organization : 神奈川歯科大学歯科補綴学教室第一講座
Journal : 神奈川歯学
Volume : 25
Number : 2
Page : 242-249
Year/Month : 1990 / 9
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」 咬合に関する音響振動現象は臨床において聴診法, 触診法等に応用され, 実際にサウンドチェッカー等の診断法として顎機能の解明に役立っている. 咬合音および顎口腔における振動の伝達に関する研究は, すでに, Watt, Bekesy, 松尾, 石岡, 豊田らにより, 多岐にわたり報告がなされている. 当教室では今までに咬合力を動的荷重と考え, モーダル解析法により義歯や生体側の様々な動態解析をアニメーション化して行ってきた. その結果, 咀嚼時には咬合力により歯や歯槽骨に一時的変形が生じていることが解り, 小森は, ヒト乾燥頭蓋において歯に衝撃を加えたときの振動伝達特性をモーダル解析法によりアニメーション化して報告している. これらは頭蓋の動態を理解しやすくするために頭蓋骨, 下顎骨をそれぞれ単独の状態とし, 加振力を上下顎第一大臼歯に加えている. 今回はさらに研究を進める目的で上下顎を疑似関節円板を介して一体とし, 咬合状態で弱いタッピングに相当する0.3Gと, 強いタッピングに相当する1Gをオトガイ部より加え, ヒト乾燥頭蓋の動態解析をより実際に近づいた実験条件で行い, 多少の知見を得たので報告する.
Practice : 歯科学
Keywords : ハンマ, 線形性, 相反性

English

Title : A Study of Linearity and Reciprocity during Shock applied with a Hammer to Human Dry Skull
Subtitle :
Authors : Yuko KUMAZAWA, Junpei SEKIGUCHI, Minoru SAITO, Kazuto HONMA, Minoru TOYODA, Etsuro MATSUO
Authors(kana) :
Organization : The 1st Department of Prosthetic Dentistry, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 25
Number : 2
Page : 242-249
Year/Month : 1990 / 9
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : [Abstract]: The authors used a human dry skull on which the cranial bone mandible had been joined with an artificial articulator disk to form a single unit. Impact acceleration corresponding to weak and strong tapping was considered a dynamic load in examining the vibration transfer characteristics of the facial cranial bone when impact was applied from the mentum section in a situation designed to be closer to reality. Flexicon injection type (resonance frequency f0=100 to 150Hz, produced by GC Corp.) was applied to the human dry skull as an artificial periodontal membrane at thickness of 0.3 mm. In addition, Exaflex heavy body type (f0=400Hz, produced by GC Corp.) was applied as an artificial disk. This was then placed on a damper produced by spreading a rubber dam sheet with a thickness of 35μm on a tire tube with a diameter of 35cm and an air pressure of 35kg/cm2. Investigations were then made concerning linearity and reciprocity to determine whether an experimental system could be achieved or not. This was then followed by modal analysis. As a result, the following matters were ascertained : (1) The resonating area differed according to the extent of the force. (2) An increase in the viscoelastic elements of the silicon was accompanied by attenuation of force. (3) Directionality of force attenuation was caused by the complexity of the bone structure. (4) A tapping force of 0.3G or 1G was sufficiently attenuated by the facial cranial bone. (5) The transfer function at the bone seams and thinner areas of the bones was insufficient for modal analysis of the facial region and total cranial bone of the human dry skull.
Practice : Dentistry
Keywords :