Abstract
The optimum concentration and application time for an experimental dentin primer composed of an aqueous solution of 1, 6-hexanediol were determined by measuring the wall-to-wall polymerization contraction gap width of a commercial light-activated resin composite in a cylindrical dentin cavity prepared in an extracted human molar. Contraction gap formation was completely prevented only when the dentin cavity wall was primed with 45wt% 1, 6-hexanediol for 60s. There were no significant differences in tensile bond strength among primers composed of 20.0-57.5wt% 1, 6-hexanediol. These results suggest that the optimum concentration and application time are 45wt% and 60s, respectively.
