アブストラクト(24巻1号:神奈川歯学)

神奈川歯学

Japanese

Title : モーダル解析からみた金属床フィニッシングラインの検討
Subtitle : 原著
Authors : 三宅亘, 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 : 24
Number : 1
Page : 1-23
Year/Month : 1989 / 6
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」義歯の動態を求めた報告には, 歪み計, 光弾性法を利用した報告があるが, これらは静的荷重下における義歯の変形を求めたものであり, 動的荷重下での義歯の動態を求めたものではない. また近年, 義歯の動揺をMKG, 光ファイバーセンサー等を使用して求めた報告もあるがモーダル解析のように動態観察はできない. さらに, 有限要素法の応用により義歯の静的および動特性を求める試みも行われているが, 有限要素法は力学特性の異なる多くの材料からなる弾性複合体のモデル化に際し, 与えるパラメータによっては正確な解析を行う事はできない欠点を有している. そこで筆者は, 松尾ら, 白沢が歯科界に導入したモーダル解析法を用いて義歯の動態を把握する事とした. この方法は, 有限要素法では, 難点とされていた試料実物の計測に基づいた振動系の種々のパラメータを真値として捕らえられるので, そのデータはきわめて信頼性の高いものである.
Practice : 歯科学
Keywords : モーダル解析, 付線, 連結装置

English

Title : The Study on the Finishing Line of the Metal Framework in terms of Modal Analysis
Subtitle : Original article
Authors : Toru MIYAKE, Etsuro Matsuo
Authors(kana) :
Organization : The 1st Department of Prosthetic Dentistry, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 24
Number : 1
Page : 1-23
Year/Month : 1989 / 6
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Abstract : The finishing line on a metal framework strengthens the mechanized coupling between the metal and the resin. However, due to extreme variations in metal thickness on the finishing line section, stress tends to concentrate in certain areas during function, making the finishing line an area with frequent denture breakage in a clinical setting. The author used modal analysis to clarify the manner in which stress concentrates on the finishing line. The activity observed was them used to determine the influence on the activity of the finishing line from factors such as differences in the finshing line angle, differences in the major connector and differences in the skeleton configuration. The following results were obtained. 1. Regarding the reasonance frequency of the test materials, modes 6-7 were detected. 2. Displacement in the periphery of the finishing line and for the major connector in each mode was extremely small compared to the amount of downward pressure on the mucose and the labio-lingual displacement of natural teeth. 3. The activity of the test materials between 200Hz and 300Hz was the rigid body mode for the entire test material using as a fulcrum the rest on the side where vibration was applied. There was resonance detected in the test materials between 1kHz and 6kHz. 4. It is believed that there is less concentration of stress on a palatal bar when the angle of the finishing line is an obtuse angle. 5. It was difficult to determine any effect on activity due to the difference in the angle of the finishing line on a palatal bar, lingual bar and lingual plate. 6. The skeleton configuration was more bended the lattice type than the ladder type.
Practice : Dentistry
Keywords :