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Journal of Dental Research
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Rheological Properties of Elastomers during Setting

J.F. McCabe

Dental Materials Science Unit, The Dental School, Framlington Place, Newcastle upon Tyne NE2 4BW, United Kingdom

T.E. Carrick

Dental Materials Science Unit, The Dental School, Framlington Place, Newcastle upon Tyne NE2 4BW, United Kingdom

A controlled stress rheometer has been used to monitor the changes in rheological properties occurring in five elastomeric impression materials during setting. The rheometer differs from conventional rotary viscometers in that the torque is the controlled variable, and the resulting deformation is measured. The use of such an instrument in oscillatory mode enables a range of rheological parameters-including viscosity, rigidity, and elasticity-to be monitored during setting. The polyvinylsiloxane impression materials develop elasticity at a rate that would not be apparent from measurements of viscosity or rigidity alone. This highlights the potential danger of basing the evaluation of clinically important properties, such as working time, on simple measurements of viscosity or rigidity.

Journal of Dental Research, Vol. 68, No. 8, 1218-1222 (1989)
DOI: 10.1177/00220345890680080101
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This article has been cited by other articles:


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 JDRHome page
J.F. McCabe and H. Arikawa
Rheological Properties of Elastomeric Impression Materials Before and During Setting
Journal of Dental Research, November 1, 1998; 77(11): 1874 - 1880.
[Abstract] [PDF]

Home page
 JDRHome page
J.F. McCabe and T.E. Carrick
Onset of Elasticity in Setting Elastomers
Journal of Dental Research, September 1, 1990; 69(9): 1573 - 1575.
[Abstract] [PDF]