Abstract
It is said that plastic teeth possess the ability to flex, thereby absorbing a greater amount of the masticatory impact when deflective contacts are encountered. The purpose of this study wasto investigate dynamic viscoelastic properties of artificial teeth. The test specimens were composedof artificial teeth (Livdent FB-20 teeth, lower second premolar, made from either plastic or porcelain, both by G. C. Co.) and heat-cured denture base resin. The compressive stress, strain and their phasedifference were measured directly by using the viscoelastic spectrometer of Orientec Co., Ltd. with theadoption of the forced vibration non-resonance method. The frequencies used in our experimentwere 11, 35, 110 Hz. The static compression (20.0 N) was given previously to the test specimen, and then together on this force the vibratory force (5.0, 10.0, 15.0 N) was to be put on in order tosimulate the condition in vivo.
The results are that plastic teeth showed low modulus of elasticity, high fracture toughness andhigh shock absorbing ability compared with porcelain teeth.
