Journal of Dental Research, Vol 69, 1240-1243, Copyright © 1990 by International & American Associations for Dental Research Online Journals

ARTICLES

Complete marginal seal of Class V resin composite restorations effected by increased flexibility

C. M. Kemp-Scholte and C. L. Davidson
Department of Clinical Materials Science, ACTA, University of Amsterdam, The Netherlands.

The use of adhesive resin composites for restoration of Class V lesions often results in cervical marginal gap formation due to polymerization contraction. In this laboratory study, flexible linings applied between the bonding agent and the bulk restorative appeared to preserve the marginal integrity of Class V restorations during curing. Measurements of the polymerization contraction stress showed 20 to 50% relief due to various flexible intermediate materials. Apparently, reduction of the total stiffness by application of an intermediate layer can render the total restoration sufficiently flexible to compensate for that part of the stress that would otherwise exceed the bond strength.

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