Journal of Dental Research, Vol 67, 841-845, Copyright © 1988 by International & American Associations for Dental Research Online Journals
Marginal sealing of curing contraction gaps in Class V composite resin restorations
C. M. Kemp-Scholte and C. L. Davidson
Department of Clinical Materials Science, ACTA, University of Amsterdam, The Netherlands.
When one uses composite resins, the curing contraction, the stiffness of
the material, and the strength of the vulnerable dentinal bond are
important factors in determining the marginal adaptation of the
restoration. Calculations based on these intrinsic material properties have
indicated that both bulk placement and incremental placement of the
restorative material in the cervical cavity inevitably lead to marginal gap
formation. Sealing of this gap with an unfilled low-viscosity resin,
directly after the composite resin is cured, may lead to perfectly closed
restoration margins, provided that composites with low linear curing
contraction and low Young's modulus are used. These conditions were
experimentally shown to be valid for laboratory and clinical situations.
