The effect of a light-cured periodontal dressing material on HeLa cells and fibroblasts in vitro. The effect that a visible light curing periodontal dressing material based upon a urethane dimethacrylate resin has upon HeLa cells and fibroblasts in its uncured and fully cured state has been examined in vitro. Results Fully cured material has no effect on either cell type.
Uncured material produces a surrounding zone of growth inhibition and cell death on direct contact.
Unhibition is caused by the release into the medium of substances toxic to cells. It is suggested that partly cured material containing residual free monomer in contact with a healing gingival site could impede rapid repair.