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Capillary rheology of two composite resin systems
Author(s) -
WATTS D. C.,
COMBE E. C.,
GREENER E. H.
Publication year - 1980
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.1365-2842.1980.tb00467.x
Subject(s) - shear thinning , rheology , composite number , materials science , shear rate , composite material , power law , capillary action , exponent , shear (geology) , thermodynamics , shear stress , mathematics , physics , linguistics , statistics , philosophy
Summary The rheological properties of two commercial resin systems, Isopast and Cosmic, were studied in the shear rate range 0.65‐65 s −1 by capillary techniques. Isopast represents a low inorganic filled composite, whereas Cosmic is a conventionally filled system whose resin matrix resembles that of Isopast. All components of both systems obeyed power law dependence of shear stress as a function of shear rate according to the relation In τ= In K + n In γ; values of n for Cosmic catalyst and paste and Isopast paste were of the order of 0.6 whereas Isopast catalyst was of the order of 0.3. Setting systems obeyed a power law relationship during the working time with an exponent n≃0.7‐1.0. Accordingly the systems appear pseudoplastic in component form and slightly pseudoplastic to near Newtonian after mixing.