The validity of determining the working times of polymeric restorative materials with the use of rheologic methods in the laboratory has been investigated by measuring the adaptation of polymeric restorative materials to artificial cavities when inserted at 30-second time intervals during their setting reactions. There was a significant deterioration in adaptation during the working times which suggests that small changes in viscosity early in the setting reactions radically affect the materials' mobility.
References
1.
Jacobsen, P.H. , and Von Fraunhofer , J.A.: Setting Characteristics of Anterior Restorative Materials, J Dent Res53: 461, 1974.
2.
Bovis, S.C.; Harrington, E.; and Wilson, H.J.: Setting Characteristics of Composite Filling Materials, Br Dent J131: 352, 1971.
3.
Specification for Resin-Based Dental Filling Materials, London: British Standards Institution, BS5199, 1975.
4.
Jacobsen, P.H. : An Assessment of the Influence of the Setting Characteristics of Polymeric Restorative Materials on Their Possible Clinical Behavior, MDS thesis, University of London, 1975.
5.
Bowen, R.L., and Argentar, H.: Tertiary Aromatic Amine Accelerators with Molecular Weights Above 400, J Dent Res51: 473, 1972.
