アブストラクト(24巻3号:神奈川歯学)

神奈川歯学

Japanese

Title : 支台装置差による片側遊離端義歯の動態分析
Subtitle : 原著
Authors : 藤澤國興, 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 : 3
Page : 463-483
Year/Month : 1989 / 12
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「I. 緒言」生体と調和のとれた補綴装置を製作して口腔内で適切に機能させる事は, 補綴臨床上の大きなテーマの一つである. パーシャルデンチャーにおいては, 欠損の形態, 欠損部粘膜状態, 支台歯や残存歯の状態という様な生体側の構成要素と, 支台装置を始めとする義歯側の多数の構成要素が複雑に絡みあい, 生体と調和のとれた補綴装置を製作するのを困難にしている. また, できたとしてもその持続期間は比較的短い場合が多い. 従来より, これらの問題点を解明する為に, 義歯床下の変位量, 支台装置による支台歯の動揺度測定, 支台歯の連結固定による支台歯の負担軽減効果, 有限要素法による義歯および支台歯の応力解析などの多種の研究が行われているが, いずれも持続的な静的荷重下での実験にとどまり, 機能時の状態を推定するには到らず問題解決策としては不十分である. 当教室では, これらの問題点を解決する目的で, 機能時の状態を想定した動的荷重下における一連の研究を行い, 最近では米谷が下顎第一大臼歯欠損症例に対して, 固定性ブリッジ, コーヌステレスコープデンチャー, クラスプデンチャーの3種類の異なる支台装置を設計し, これらの差が支台歯と義歯に与える影響を分析している.
Practice : 歯科学
Keywords : モーダル解析, 片側遊離端, 義歯の動態, 支台歯の負担力

English

Title : An Analysis of Movement in a Unilateral Free-End Denture Due to Retainer Differences
Subtitle : Original article
Authors : Kunioki FUZISAWA, Etsuro Matsuo
Authors(kana) :
Organization : The 1st Department of Prosthetic Dentistry. Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 24
Number : 3
Page : 463-483
Year/Month : 1989 / 12
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Abstract : In daily practice, cases of unilateral free-end saddle involving loss of two teeth are apt to cause problems such as a loss of function and injury on the abutment teeth due to instability of the dentures. In attempting to remedy these problems, a variety of prosthesis have been used and their dynamics analyzed. Nevertheless, dynamics during function, one basis for judging the relative worth of prostheses, remain unclear. In this study, modal analysis and linear-value analysis were used to derive values for the dynamics of the denture during function of a cone telescopic denture, an attachment denture and a clasp denture as well as impact on the abutment teeth. The following results were obtained : 1. Characteristic frequency and observation of animation showed that : (a) Mode #1 is the vibration mode for the entire system including the denture. (b) Mode #2 is the vibration mode for the abutment tooth itself. (c) Mode #3 is the mode for the resin or the metal frame of the denture. 2. In the direction of the tooth axis, the tendency for displacement of the abutment tooth decreased in the following order : unilateral clasp denture > bilateral clasp denture > cone telescopic denture > attachment denture. 3. In a bucco-labial direction, the order was as follows : unilateral clasp denture > bilateral clasp denture > cone telescopic denture > attachment denture. 4. In a mesio-distal direction, the order was as follows: unilaeral clasp denture > attachment denture > cone terescpic denture > bilateral clasp denture. 5. A comparison with the clasp denture in terms of attenuation hints at the possibility that the design is superior with the cone telescopic denture and the attachment denture in cases of free-end saddle.
Practice : Dentistry
Keywords :