錬線材クラスプが支台歯の状態に及ぼす影響の解析

The analysis of the effect of wrought wire clasps on the conditions of abutment teeth.

抄録

取り外し可能な部分床義歯（RPD）から分離された錬金ワイヤークラスプ（WWC）のバネ定数（k）の実験室評価と、エナメル質の摩耗の常用力依存性を表す脛骨試験の結果が論文で発表された。実験室での検査結果は、支台歯の摩耗レベルの臨床評価結果と組み合わされた。RPDの使用時間とWWCが支台歯に及ぼす法線力である。法線力は、WWCが歯に接触する場所に大きく依存する。また、摩耗の程度が大きい支台歯は、より緩むことが判明しています。WWCの製作に使用したワイヤーの直径、アームの全長、およびアームの全長に対して決定したkは、支台歯の摩耗規模に影響を及ぼさなかった。

Laboratory evaluation of spring constants (k) of wrought wire clasps (WWC) separated from removable partial denture (RPD) and the results of tibological tests which represent the dependence of enamel wear with normal force have been presented in the paper. The results of laboratory examinations have been combined with the results of clinical assessment of the level of abutment teeth wear. On the basis of the examinations performed it has been revealed that the following factors have the greatest impact on tribological wear of abutment teeth: the time of using RPD and the normal force exerted by WWC on abutment tooth. Normal force depends to a great extent on the place of contact of WWC with the tooth. It has also been found that abutment teeth featuring higher scale of wear are more loosened. The diameter of wire used for making WWC, total length of the arm and k determined for the total length of the arm did not have any impact upon the scale of wear of abutment teeth.