アブストラクト(15巻2号:神奈川歯学)

神奈川歯学

Japanese

Title : 既製スタッドアタッチメントの振動伝達性状に関する研究
Subtitle : 原著
Authors : 中沢清
Authors(kana) :
Organization : 神奈川歯科大学補綴学教室
Journal : 神奈川歯学
Volume : 15
Number : 2
Page : 202-229
Year/Month : 1980 / 9
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「抄録」 スタッドアタッチメントの特性について, 静的荷重を用いて模型上でその許容運動を求めた研究は数多くあるが, 咬合時の状態に近い動的荷重として特性を求めたものは少ない. 著者は支台歯に対する影響を求める以前に, 既製スタッドアタッチメントの特性が動的荷重下でどのように変化するか, またどのような因子が影響をあたえるかを探究し, 装置の選択や開発の一助とすることが重要と考えて本研究に着手した. 本研究は荷重を衝撃として考え, 装置内の抵抗状態を直接求められる機械インピーダンスを利用して振動学的解明を行なった. 実験試料に既製スタッドアタッチメント10種類を選択し, これらをバネ部分の構造によって大別しておのおのの特性を検討した. さらに, 求められた結果のみでは解析不十分なものについては, 拡大モデルを用いて実験し, 波形パターン上から装置の特性やバネ効果の様式を読みとるべく検討を行ない, 次の結果を得た. 1)既製スタッドアタッチメントの共振周波数帯域は8KHz~2KHz帯域にあり, 板バネ形式の維持力をもつ装置が高い帯域に, クラスプ様維持力や材質自体の弾性を利用したものは, より低い帯域にあった. 2)上記の帯域は板バネ形式のものが60°加振で1オクターブ低下し, その他の形式のものは60°加振でも変化がなかった. 3)Zm値はRothermannが小さく, 他の装置と差を玉めたが, Rothermann以外の対比間では大差を認めなかった. 4)Rothermannを除く装置は60°加振において, 独立したバネ機構と考えられる500Hz~1KHz帯域のf2が発現した. 5)同系のアタッチメント間ではnonresilientとresilientの差は振動学的には認められないものが多かった. 6)60°加振におけるf2, Zm2の発生は, 板バネ機構によるもので, 板バネ機構の存在位置(メールかフィメール)に関係がなかった. 7)装置の大部分が弾性源となるものは, f2, Zm2の値がf1, Zm1に接近し, 場合によっては一体となるものがあった.
Practice : 歯科学
Keywords :

English

Title : Studies on the Characteristics in Transfer Vibration of Pre-fabricated Stud Attachments.
Subtitle :
Authors : Kiyoshi Nakazawa
Authors(kana) :
Organization : Department of Prosthetic Dentistry, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 15
Number : 2
Page : 202-229
Year/Month : 1980 / 9
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Among research studies on the properties of the stud attachment there are several which have used static weighting on a model to find out permitted movement. There are few studies, however, which have concentrated on the properties revealed when dynamic weighting similar to occlusal force is applied. Before studying influences on the abutment teeth, the author sought to discover what changes took place in pre-fabricated stud attachments under dynamic weighting and what factors acted to bring about these changes. He undertook the experiment as a possible aid in selection and development of devices. The present experiment took weight as a form of shock and used mechanical impedence as a method of directly assessing resistance properties within the device, seeking to interpret results in terms of oscillatory science. The author selected 10 types of pre-fabricated stud attachments for the experiment and classified them according to the structure of their spring section or the section which acted as a spring. Feeling the information gained from those results to be insufficient, the author further used an enlarged model and performed tests to determine the properties of the device and effectiveness of spring properties in terms of oscillatory wave patterns. The following are the results. 1) The resonance frequency for the pre-fabricated stud attachments lay between the 8KHz and 2KHz bands on the recorder. Those devices having the resistance power of the flat-spring showed high frequency levels. Devices with clasp resistance power and which also took advantage of the elasticity of the device itself showed lower frequency levels. 2) For the above frequency bands, flat-spring models descended one octave at an acceleration of 60°. The other devices showed no change at 60° acceleration. 3) The Zm index for the Rothermann was small compared with the other devices. But there were no large differences found in other areas of comparison. 4) Except for the Rothermann, the devices produced an f2 in the 500Hz to 1KHz area at 60° acceleration, which could be interpreted as due to the independent spring construction. 5) In studying devices of the same construction, the author found that in many cases he could not distinguish between non-resilient and resilient in terms of oscillatory science. 6) The f2 and Zm2 recorded at 60° acceleration were due to the flat-spring construction itself and not to the position of the flat-spring construct (i.e. male or female). 7) As sources of elasticity for the devices as a whole, we can cite that the index for Zm2 and f2 approached that of the f1 and Zm1 and in some cases the two merged.
Practice : Dentistry
Keywords :