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The Competition between the Composite-Dentin Bond Strength and the Polymerization Contraction Stress
C.L. Davidson
Department of Dental Materials Science of the University of Amsterdam, Louwesweg 1, 1066 EA Amsterdam, The Netherlands
A.J. De Gee
Department of Dental Materials Science of the University of Amsterdam, Louwesweg 1, 1066 EA Amsterdam, The Netherlands
A. Feilzer
Department of Dental Materials Science of the University of Amsterdam, Louwesweg 1, 1066 EA Amsterdam, The Netherlands
The influence of contraction stresses, developed during the polymerization of composites, on adhesion to dentin treated with a dentin adhesive was studied for a chemically- and a light-activated microfilled composite, in both linear and 3-D models.
The linear model consisted of an arrangement set up in a tensilometer in which the composites could be applied to a flat dentin surface fixed to the stationary cross-head at one end, and mechanically clamped to the cross-head connected to the load cell at the other end. The increase of the bond strength was measured at different time intervals from the start of mixing and was compared with the developing contraction stress. Throughout the complete polymerization process, the adhesion survived the contraction stress, which is explained by flow relaxation, which can occur sufficiently in this configuration.
In the three-dimensional model, the composites are attached to more than two dentin walls. In this situation, flow is severely limited, and contraction stress values can exceed the bond strength, leading to separation. This was demonstrated in Class V cavities. The shape of the cavity is considered to be of great importance in conservation of the composite-dentin bond.
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Journal of Dental Research, Vol. 63, No. 12,
1396-1399 (1984)
DOI: 10.1177/00220345840630121101

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