Effect of Storage Conditions and Disinfection with 2% Deconex® on Dimensional Stability of Two Self-Cure Acrylic Resins

background and aim: there is a gap of information on the effect of time, disinfectant, and storage conditions on the dimensional stability of direct post patterns made of selfcure acrylic resins. this study assessed the effect of deconex ® and wet or dry storage conditions on the dimensional stability of post patterns made of duralay and gc acrylic resins.materials and methods: sixty specimens were fabricated of gc and duralay acrylic resins (n=30) by using a stainless steel mold. the specimens in each group were divided into three subgroups (n=10). the specimens of subgroup 1 were immersed in deconex ® for 2 minutes followed by dry storage at 25 °c. the specimens of subgroup 2 were stored in water at 25 °c. the samples of subgroup 3 were immersed in deconex ® for 2 minutes followed by water storage at 25 °c. the dimensions were measured immediately and 2 minutes, 1 hour, and 24 hours after setting. data were analyzed by repeated measures anova. oneway anova and t-test were used for subgroup analysis at 5% significance level.results: the greatest mean dimensional changes occurred after 24 hours in both groups. in gc group, subgroup 1 experienced minimal changes during 24 hours. duralay subgroups 1 and 2 experienced minimal changes after 1 and 24 hours; the difference between the two subgroups was not significant. maximum changes were noted in gc subgroups 2 and 3 and in duralay subgroup 3 (p<0.05).conclusion: in case of a 24-hour delay, storage conditions would have no effect on the dimensional stability of duralay patterns, while gc patterns should be stored in a dry condition.