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Viscoelastic properties of tissue conditioners — stress relaxation test using Maxwell model analogy
Author(s) -
MURATA H.,
SHIGETO N.,
HAMADA T.
Publication year - 1990
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.1990.tb00021.x
Subject(s) - viscoelasticity , analogy , stress relaxation , stress (linguistics) , relaxation (psychology) , mechanics , materials science , physics , thermodynamics , medicine , creep , philosophy , linguistics
Summary 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 E 1 , the coefficient of viscosity ν, and relaxation time tj, for each element, and the instantaneous modulus E o , 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 E 1 . The method described is considered to be one of the most useful techniques available for the study of the viscoelastic properties of tissue conditioners.