アブストラクト（16巻1号：神奈川歯学）

神奈川歯学

Japanese

Title　： 支台歯と欠損部との連結機構に関する振動学的研究
Subtitle　： 原著
Authors　： 依田英司
Authors（kana）　：
Organization　： 神奈川歯科大学補綴学教室
Journal　： 神奈川歯学
Volume　： 16
Number　： 1
Page　： 71-91
Year/Month　： 1981 / 6
Article　： 原著
Publisher　： 神奈川歯科大学学会
Abstract　： 近年, 局部義歯学において, 支台歯の特性について静的荷重を用いて模型上で検討された研究は数多くみられるが, 動的荷重下で支台歯の特性を求めたものは少ない. 著者は歯周組織と組み合わせた場合の維持装置差が, 支台歯の振動伝達特性にどのような影響を与えるかを探究し, 局部義歯の設計や維持装置選択の一助とすることが重要と考え, 本研究に着手した. 成犬の下顎を用い, クラスプ, テレスコープクラウンおよびブリッジの3様式の実験用義歯を連結機構別に製作し, ランダムノイズによる振動測定を行った. また, 振動分析には, 周波数, レベルおよび時間の三成分を鳥瞰図として同時に記録できるシステムを用い, 三次元的に検討を行って, 次の結論をえた. 1)被験義歯の減衰量は最低500Hz60°加振テレスコープクラウンの7.8db, 最高4KHz0°加振クラスプの25.6dBで, ほとんどの周波数帯域でクラスプの減衰量が最も多く, 次いでテレスコープクラウン, ブリッジの順となった. 2)63Hz～500Hz帯域では60°加振の減衰量が各被験義歯において0°加振の減衰量よりも少なく, 有意差を認めた. 3)0°加振のとき63Hz帯域でクラスプの上昇時間が長く, 他のものに有意差が認められたが, その他の帯域では有意差が認められなかった. 4)0°加振のクラスプの残留振動時間が, 各周波数帯域で他のものと比較して短かく有意差が認められた. 5)各被験義歯の特性は, 支台歯自身の振動特性パターンを大きく変化させる要素にはならないが, 特定周波数のレベルに変化をあたえた.
Practice　： 歯科学
Keywords　：

English

Title　： Connecting Mechanism for the Abutment Teeth and Edentulous Areas ; A Study in Terms of Vibratory Science
Subtitle　：
Authors　： Eiji YODA
Authors（kana）　：
Organization　： Department of Prosthetic Dentistry, Kanagawa Dental College
Journal　： Kanagawa Shigaku
Volume　： 16
Number　： 1
Page　： 71-91
Year/Month　： 1981 / 6
Article　： Original article
Publisher　： Kanagawa Odontological Society
Abstract　： In recent years we have seen many studies in partial prosthodontics using models to investigate the properties of abutment teeth under static weight. Relatively few studies have appeared, however, dealing with how abutment teeth respond to dynamic weight. The author was interested in determining what effects a retainer on the supporting tissues would have on the vibration transmitting properties of the abutment teeth. He emphasized his research as an aid in constructing partial dentures and in the selection of retainers. Using the mandible of an adult dog, he constructed three types of experimental dentures differing in their connecting mechanisms, namely, clasp, telescope-crown, and bridge. Random noise was used to determine vibration levels. Also, in analyzing data on vibration, the author used a system whereby he could concurrently map out the three components of frequency, level, and time factors to gain a three-demensional overall view of vibration effects. The results are as follows. 1) The telescope-crown displayed the lowest attenuation for the three experimental prostheses, registering 7.8 dB under conditions of 500 Hz at 60°angle of vibration. Highest in attenuation was the clasp with 25.6 dB at 4 KHz/0°angle of vibration. In almost all wave frequencies the attenuation for the clasp was lowest followed by that for the telescope crown and the bridge in that order. 2) In the range between 63 Hz and 500 Hz the attenuation for all the prostheses was less at 60°angle of vibration than at 0°angle of vibration, results which display a significant difference. 3) At 0°angle of vibration and at the 63 Hz level, the time needed for a vibration rise using the clasp was long compared to rather short rise-time for the other two prostheses. This is once again a meaningful difference. 4) At 0°angle of vibration the residual vibration time for the clasp was shorter than that for the others in all wave frequencies, a significant difference. 5) The properties of the three prostheses did not contain elements which would sizably change the vibratory patterns of the abutment teeth themselves but did produce changes at particular frequency levels.
Practice　： Dentistry
Keywords　：