義歯用軟性裏装材の弾性ならびにクリープ特性の変化

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  • 矢野 健三郎
    九州歯科大学大学院歯学研究科:九州歯科大学歯科理工学講座

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  • Changes in Elastic and Creep Properties of Denture Soft Lining Materials

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The elastic and creep properties of commercial denture soft liners were evaluated through static and dynamic creep test. The materials employed were an acrylate (Soft-liner : SL) as a tissue conditioner or a functional impression material, a fluoropolymer (Kurepeet Dough : KD) and four silicones (Neo-snugger : NS, Evatouch S : ES, Evatouch H : EH, Mollosil : ML) as resilient liners. Their changes in surface aspect in water were also examined with a scanning electron microscope. The findings obtained were as follows : 1. In the early stage of aging, SL showed larger viscous flow and creep favorable for conditioning unsound tissues or taking functional impression. However, it would no more effectively serve as those uses over the third day because of its markedly decreased thickness, loss of flow and creep rates, and increased surface roughness. 2. The resilient liners used were classified into two groups by the deformation under static compressive loading ; one involved KD and ML showing large elastic deformation and the other NS, ES and EH showing smaller deformation, less than a half the values for KD and ML. 3. The dynamic compressive creep linearly increased with increase in the repetition number of loading in the silicone materials, while KD maintained smaller level of creep. 4. All the resilient liners exhibited good elastic recovery even after six-month aging or repeated compressive preloading by 540, 000 times corresponding to the average number of mastication for a six-month period. 5. The surface roughness and pore exposure were increased by aging in water in the silicone materials. On the other hand, little change was found in the surface of KD.

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