アバットメントの水平応力。特に可撤式部分床義歯の設計の違いについて

[Horizontal stress of abutment. Particularly regarding difference in removable partial denture design].

抄録

可撤性部分床義歯による補綴は、歯の形態的欠損や機能低下を補うための日常的な臨床処置である。可撤性部分床義歯は、義歯床、支台歯、クラスプなどの多くの要素から構成されるだけでなく、形態学的に複雑な手術過程を経なければならないため、多様な咀嚼運動に対応する機能的安定性に関する多くの要因を抱えている。しかし、義歯の機能維持と安定性は基本的に支台との連結によって得られることから、義歯の動きを直接伝達するクラスプという構造要素の違いが支台に及ぼす影響について多面的な評価がなされてきた。変位による評価、マイクロダイヤルゲージ、立体カメラ、渦電流転写、耐磁素子などを用いた測定系、光弾性法、ホログラフィー、モアレ法、ストレインゲージ法などの変形測定系がある。しかし，これらのシステムはアバットメントを対象として評価する方法であり，義歯の基本的な構造要素すべてを含む評価システムではない．そこで，筆者は鋳造フレームを標準化した支台歯にaker'sクラスプとRPIクラスプを設計し，2種類のクラスプの違いによる支台歯の動力学への影響とクロスアーチの安定化を観察した(ABSTRACT TRUNCATED AT 250 WORDS)．

Prosthesis with removable partial denture is a daily clinical procedure for compensating the morphological loss and hypofunction of teeth and various gnathostomatic system. The removable partial denture not only comprises of many elements such as denture base, abutment and clasp but accordingly has to undergo morphologically complicated operative process, thus posing many factors concerning the functional stability coping with diverse masticatory motions. However, from the fact that retention and stability of the denture at it's functioning are obtained basically from it's connection with abutment, assessments in multiple aspects have been made regarding the influence exerted on abutment by difference in the structural elements, i. e. clasps, which transmit the movement of denture directly. There were the assessments by means of the displacement, measuring system by the use of microdial gage, stereoscopic camera, eddy currents transfer, and magnetic resistant element, and deformation measuring systems such as photoelasticity method, holography, moiré method and strain gage method. However, these systems are the methods for assessing abutment as subject but not the assessing system including all the basic structural elements of denture. Therefore, the author has made observation of the influence exerted on the dynamics of abutment by the difference between clasps in 2 kinds and by cross arch stabilization by designing aker's clasp and RPI clasp for the abutment by the use of cast frame standardized.(ABSTRACT TRUNCATED AT 250 WORDS)