アブストラクト(26巻3号:神奈川歯学)

神奈川歯学

Japanese

Title : 非接触型応力分析法の補綴領域への導入の試み - 各種床用材料の応力緩和について -
Subtitle : 原著
Authors : 木村朗, 松尾悦郎
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 : 26
Number : 3
Page : 225-238
Year/Month : 1991 / 12
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」義歯に加わる様々な力の解析に多くの試みがなされているが, その中に義歯の変形や破折の様相の解析手段の1つとして応力解析がある. 一般的に応力解析に用いられている測定法は, 光弾性法, 有限要素法, 歪みゲージ法, 応力塗料法ならびにレーザー・ホログラフィー法があり, これらのほとんどは静的荷重下での応力解析であり, 動的荷重下の応力変化を求めたものはあまり無い. 光弾性法では試料をエポキシなどで製作せねばならず, そのエポキシの組成を変えて測定してもあくまでも測定用試料の形態差の応力解析であり, 材質の傾向を判定することは出来ない. 同様に有限要素法はコンピュータ・シミュレーションであり, いかに応力の理論解析学が発展しコンピュータの能力が向上しても代入する値によっては, 実際の試料の測定結果と異なる可能性がある. したがって, これらの測定器における解析では, 可能な限り何らかの方法で実際の試料を用いた実験と解析結果とを対比させることが大切である.
Practice : 歯科学
Keywords : 応力解析, 床用材料, 赤外線応力画像法

English

Title : An Attempt of Introduction to Prosthodontics of a Non-contact Stress Analysis Method Stress Cushoning Ability of Denture Base Materials
Subtitle :
Authors : Akira KIMURA, Etsuro Matsuo
Authors(kana) :
Organization : The 1st Department of Prosthetic Dentistry, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 26
Number : 3
Page : 225-238
Year/Month : 1991 / 12
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Abstract: Various methods have been tested to analyze various forms of force exerted on the dentures. Stress analysis is one such method which has been used to analyze denture deformation and to observe denture fracture. Commonly, stress analysis is made using either the photoelastic method, finite element method, strain gauge method, brittle material coating method, and laser holographic method. Using these methods, stress analysis has been conducted mostly under static load conditions, and there have been few instances of conducting under dynamic load conditions. Thermoelastic stress imaging is one method enabling the measurement of stress easily and dynamically. However, it is vulnerable to ambient disturbances, and calls for obtaining average values of measurement many times to improve accuracy. For these reasons, the thermoelastic method is unfit for conducting accurate dynamic stress analysis. Our research team introduced the modal analysis method to observe a denture sample under dynamic load conditions. Modal analysis has made it possible to locate the points of stress concentraction fairly well. However, it was found to be unfit to measure stress quantitatively. Under these circumstances, we introduced OMETRON'S non-contact infrared stress analyzer SPATE 9000 to measure stress in resin-based dentures, MOLTENO as a resilient denture liner, and metal-based dentures dynamically. Based on the results of the measurement, the effectiveness of the equipment and the distribution of stress inthese materials have been studied, The results are as follows: 1. The introduction of the OMETRON'S equipment has made it possible to obtain dynamic stress distribution patterns in these materials with a high accuracy in about 8 minutes. 2. Stress in the resin base is scattered and dispersed across it, and MOLTENO absorbs stress in itself. 3. In metal base, stress concentrates on the skeleton, and in adhesive resin base stress scatters across the adhesive layer between the resin and metal.
Practice : Dentistry
Keywords :