In order to measure the viscoelastic properties of tissue conditioners, a series of stress relaxation tests was carried out using poly ethyl methacrylate polymer powders and liquids composed of butyl phthalyl butyl glycolate/ethyl alcohol mixtures, respectively. The analysis method using the Maxwell model analogy is discussed. The results may be summarized as follows. (i) In this study it was feasible to make the stress relaxation curves for 30min analogous to the Maxwell model, using a model with a maximum of 5 elements. (ii) The elastic modulus E1, the coefficient of viscosity ν, and relaxation time tj, for each element, and the instantaneous modulus Eo, tended to increase with time. These values in the element of the longest relaxation time were most marked in the increase among those in all the elements. Furthermore, in every element the rate of increase of ν was greater than that of E1. The method described is considered to be one of the most useful techniques available for the study of the viscoelastic properties of tissue conditioners.
|Number of pages||11|
|Journal||Journal of oral rehabilitation|
|Publication status||Published - 1990 Jul|
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