Table 2.

Mean µTBS values ± standard deviations expressed as MPa. Different letters show statistically significant differences among groups in the row (p < 0.05). Capital letters indicate significant differences among groups in the column (p < 0.05). Numbers indicate statistically significant differences between T₀ (specimens tested after 24 h) and T₁₂ (specimens tested after storage for 12 months in artificial saliva at 37 °C) (p < 0.05). Percentages of failure modes after µTBS test are also shown. A common trend was the occurrence of mixed failures in all the experimental groups, irrespective of the storage condition. Cohesive failures in composite were only recorded for RXU at baseline, irrespective of the curing mode. After aging, an increase of adhesive failures was observed for RXU in both curing modes

Materials	RXU		VAR
Curing mode	SC	DC	SC	DC
T0 (MPa)	23.8 ± 8.4 C1	40.8 ± 10.4 A1	23.3 ± 9.8 C1	33.3 ± 8.0 B1
	95% M; 5% CC	98% M; 2% CC	82%M; 18%AD	92% M; 8% AD
T12 (MPa)	20.8 ± 9.1 b2	26.6 ± 8.5 a2	14.4 ± 6.8 c2	28.5 ± 11.0a2
	88% M; 12% AD	97% M; 3% AC	93% M; 7% AC	100% M