Abstract
Purpose: Temporary restorative materials are widely used as short-term seals after cavity preparation for indirect restorations. Recently, an experimented temporary material containing S-PRG filler has been developed. The purpose of this study was to examine the marginal sealing ability of experimental temporary restoration materials. Methods: Five chemical-cured type temporary materials and three light-cured type temporary materials were used in this study. Cavity preparations were prepared, then the temporary restorative materials were condensed into the cavity according to each manufacturer's instructions. Specimens were stored in 37℃ water for 24 h (24 h group). After storage, half of each group was thermally stressed for 100 cycles at 5℃ and 55℃ (TC group). All specimens were immersed in 0.5 % basic fuchsin solution for 24 h and the degree of dye penetration was scored. Thermal expansion of the materials was also measured. Results: For the 24 h group, chemical-cured materials showed less dye penetration, then light-cured materials showed good marginal sealing. For the TC group, less dye penetration was observed for chemical-cured materials, but light-cured materials showed reduced marginal sealing. Conclusions: From the results of this study, the experimental temporary restorative materials containing S-PRG filler showed good marginal sealing with lower thermal expansion.