人工歯の動的力学特性 Dynamic Mechanical Properties of Artificial Teeth
The purpose of this investigation is to evaluate the dynamic viscoelastic properties of artificial denture teeth using a viscoelastic spectrometer. Specimens were porcelain and resin teeth mounted in denture base. The measurement of viscoelastic frequency spectrum based on the fast fourier transform of displacement to applied random forces was analyzed using spectrum analyzer. The materials was tested under two dynamic conditions. One was a static load of 10.0N and a dynamic peak load of 3.0N. Second was a static load of 20.0N and a dynamic peak load of 5.0N. The dynamic stiffness of the porcelain specimens measured under each condition was significantly (P<.001) higher than that of the resin specimens. The phase lag of the porcelain specimens measured under each condition was significantly (P<.001) lower than that of the resin specimens. The results of this study revealed that the resin teeth had greater toughness and higher shock-absorbing ability than the porcelain teeth. It was indicated that the porcelain teeth were more brittle material than the resin teeth.
日本レオロジー学会誌 27(1), 49-52, 1999-03
The Society of Rheology, Japan