アブストラクト(23巻4号:神奈川歯学)

神奈川歯学

Japanese

Title : 支台装置差による義歯と支台歯の動態解析
Subtitle : 原著
Authors : 米谷明, 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 : 23
Number : 4
Page : 486-509
Year/Month : 1989 / 3
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」口腔内に装着される補綴物は, 形態, 機能の回復とともに残存組織に障害を与えることなく生体と調和し, 再構成した状態を維持していくことが望まれる. とくにパーシャルデンチャーでは, 支台歯と欠損部顎堤との咬合圧の負担能力差および被圧変位量差を生じるため, 支台歯の負担過重による寿命の短縮を招来しやすく, その設計は困難なものとなる. 臨床上, 支台歯の保護を考慮した補綴装置の設計において, 支台歯と義歯の結合様式はいわゆる緩圧型から非緩圧型へ, または緩圧型であってもわずかに動きを認めるものへとその考え方は変化してきているが, 実際に口腔内に装着された義歯を含めた顎口腔系, とくに支台歯の動態についてはなお不明な点が多く, 支台歯と義歯の結合様式において客観的評価は未だに困難である. この点を解明するために多くのシュミレーション実験が行われてきた. 岡田, 長久保, 健石, Aydinlikらは, 支台歯の連結固定による支台歯の負担軽減効果を報告し, 水川は三次元光弾性法を応用して支台歯と顎骨および顎粘膜の応力解析を行い, ステレォフォトグラミックシステムを用いてEickらは可撤性パーシャルデンチャーの適合精度が支台歯に与える影響を, Browingらはクラスプ形態の差による支台歯への影響を報告している.
Practice : 歯科学
Keywords : モーダル解析, 支台装置, 義歯の動態

English

Title : Analysis of Movement in Partial Prostheses and Abutment Teeth with Differences in Retainer
Subtitle : Original article
Authors : Akira YONETANI, Etsuro Matsuo
Authors(kana) :
Organization : The 1st Department of Prosthetic Dentistry Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 23
Number : 4
Page : 486-509
Year/Month : 1989 / 3
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Abstract : When designing a prosthesis in a clinical setting that takes into consideration the protection of the abutment teeth and alveolar ridge, it remains difficult to carry out a method of conneecting the abutment tooth and prosthesis based on objective grounds. This is because there are still many matters that remain unclear about dynamics of the stomatognathic system, including the prosthesis, when attached in the oral cavity. The author created the following three prostheses on a simulation model of a tooth bone saddle that included an artificial mucos membrane and periodontal membrane : (1) A fixed bridge, (2) A telescopic denture (Konuskronen Telescope), (3) An Akers clasp denture. Following this, flat-controlled random noise was applied to each denture to create a dynamic load that exhibits a state closer to a clinical situation. Modal analysis was carried out with a laser doppler vibrometer and observations were made of the prosthesis and the abutment tooth apex to obtain visual clarification of dynamics, The following results were obtained. 1. As far modal resonant frequency, in mode #1, the bridge measured at 483 Hz and 561 Hz, the Telescope at 452 Hz and 600 Hz and the clasp at 581 Hz and 596 Hz. In mode #2 the bridge measured at 1,355 Hz and 1,370 Hz, the Telescope at 1,343 Hz and 1,040 Hz and the clasp at 1,114 Hz and 1,079 Hz. In mode #3, only the bridge was detected and the recorded values 1,906 Hz and 2,026 Hz. 2.The influence on the modal resonant frequency due to the difference in abutment devices was limited. 3. Observation of animation indicated that the tendency for lateral movement of the abutment teeth increased going from the bridge to the Telescope to the clasp. 4. Displacemnt of the abutment tooth root apex decreased in reverse proportion to the strength of the connection between the abutment tooth and the abutment device.
Practice : Dentistry
Keywords :