IADR Abstract Archives
The Characteristics of Resin-based Core Materials
Objectives: The aim of this study was to evaluate flexural strength and curing depth of the experimental and commercial resin-based core materials.
Methods: The experimental resin core (LN) and Beauti core LC Injectable (BC; Shofu) as light cure type, and Clearfil DC core Automix (DC; Kuraray Noritake Dental), Esthe Core (EC; Tokuyama Dental), Luxa core (LC; DMG) and Unifil Core EM (UC; GC) as dual cure type were used. The specimens of flexural strength were prepared with size of 2mm x 2mm x 25mm. Three-points bending test were performed after each storage: storing in air at room temperature for 7 days (R group), storing in distilled water at 37°C for 7 days (W group), and storing in thermal stress (5 and 55 °C) for 10,000 cycles (T group) (n=3). The curing depth was prepared with size of 12 mm thickness and irradiated. And then a half of length of the cured body was measured (n=7). These data were analyzed using one-way ANOVA followed by Tukey’s multiple comparison test (α=0.05).
Results: The flexural strength of all resin core materials were equally or lower than that of dentin, and that of LN, BC, EC and LC at R group were significantly lower than after thermal stress (T group). The flexural modulus of all resin core materials were similar to dentin, and that of LN, LC and UC were no significant difference after distilled water or thermal stress. The curing depth of LN (4.0 ± 0.1 mm) was significantly higher than the other resin core except UC (5.9 ± 0.2 mm), and that of LN was significantly higher compared with BC(2.8 ± 0.1 mm) in the light cure type.
Conclusions: It was suggested that LN would be useful for preventing root fracture and could be cured in the deep root canal as well as the other resin-based core materials.
Methods: The experimental resin core (LN) and Beauti core LC Injectable (BC; Shofu) as light cure type, and Clearfil DC core Automix (DC; Kuraray Noritake Dental), Esthe Core (EC; Tokuyama Dental), Luxa core (LC; DMG) and Unifil Core EM (UC; GC) as dual cure type were used. The specimens of flexural strength were prepared with size of 2mm x 2mm x 25mm. Three-points bending test were performed after each storage: storing in air at room temperature for 7 days (R group), storing in distilled water at 37°C for 7 days (W group), and storing in thermal stress (5 and 55 °C) for 10,000 cycles (T group) (n=3). The curing depth was prepared with size of 12 mm thickness and irradiated. And then a half of length of the cured body was measured (n=7). These data were analyzed using one-way ANOVA followed by Tukey’s multiple comparison test (α=0.05).
Results: The flexural strength of all resin core materials were equally or lower than that of dentin, and that of LN, BC, EC and LC at R group were significantly lower than after thermal stress (T group). The flexural modulus of all resin core materials were similar to dentin, and that of LN, LC and UC were no significant difference after distilled water or thermal stress. The curing depth of LN (4.0 ± 0.1 mm) was significantly higher than the other resin core except UC (5.9 ± 0.2 mm), and that of LN was significantly higher compared with BC(2.8 ± 0.1 mm) in the light cure type.
Conclusions: It was suggested that LN would be useful for preventing root fracture and could be cured in the deep root canal as well as the other resin-based core materials.