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Background This study was conducted to evaluate the effect of radiation exposure and storage time on the degree of conversion (DC%) and flexural strength (FS) of three different resin composites. In total, 90 disk-shaped, and 360 rod-shaped composite specimens were prepared to evaluate the DC% and FS, respectively. Specimens were divided into 18 groups (DC%:  n  = 5 and FS:  n  = 20) according to the three experimental factors of the study: 1—Radiation (no-exposure and exposure), 2—Resin composite material (Herculite XRV Ultra, Z250 XT and Grandio), and 3—Storage time (24 h in distilled water, 3-m and 6-m in 70% ethanol). Fourier transform infrared spectrometer (FTIR) was used to determine the DC%. For FS, the specimens were subjected to a three-point bending test at 1 mm/min crosshead speed. Data were analyzed using three-way ANOVA/Tukey HSD test. Significant level was set at  P  =  0.05 . Results For DC%, there was no significant difference between no-radiation exposure and radiation exposure ( P  &gt;  0.05 ). Herculite XRV Ultra revealed the highest statistically significant DC% ( P  &lt;  0.05 ). The 24-h storage time revealed the least significant DC% ( P  &lt;  0.05 ). For FS, radiation exposure showed a statistically significant higher value compared to no-radiation exposure ( P  &lt;  0.05 ). Herculite XRV Ultra showed the least FS value ( P  &lt;  0.05 ). The 24-h storage time showed the highest significant value ( P  &lt;  0.05 ). Conclusions Radiation exposure has no significant impact on the DC% of the different resin composites, but it has a significant positive effect on the FS. Storage time had a significant effect on both DC% and FS.

The effect of radiation exposure and storage time on the degree of conversion and flexural strength of different resin composites