Influence of immediate and delayed post space preparation on sealing ability of resilon

Objective. The purpose of this study was to evaluate the effect of immediate and delayed post space preparation on the sealing ability of a new root canal filling material. Study design. Seventy-two extracted teeth were prepared and obturated with gutta-percha/AH-Plus and Resilon/Epiphany sealer by the lateral compaction technique. The teeth were divided randomly into 4 groups, and the post space was prepared either immediately after filling or after the obturated teeth had been stored in saline at 37 degrees C for a week. Leakage was determined by a fluid-transport device. Results. The results showed that immediate post space preparation of the Resilon/Epiphany-filled group had a mean leakage value of 0.81 mu L/h, whereas the delayed preparation had a mean leakage value of 0.75 mu L/h. No difference (P > .05) in microleakage was found between gutta-percha/AH-Plus and Resilon/Epiphany-filled groups after immediate preparation. There was significant difference between gutta-percha/AH-Plus and Resilon/ Epiphany groups in the delayed post space preparation (P < .05). Conclusion. Epiphany/Resilon obturation achieved better sealing than gutta-percha/AH-Plus at the apical end, especially in delayed post space preparation when mechanical techniques were used.