Abstract
Adaptation to dentin cavity wall of three marketed and eight experimental composites was investigated by measuring polymerization contraction in cylindrical dentin cavities and by SEM observation. The cavity adaptation of light cured composites was always inferior to that of the chemically cured composite and, in the experimental composites, the optimum filler content was obtained.
These facts indicate that cavity adaptation is affected significantly by the flow of the composites from the free surface into the cavity during polymerization.
