In-vitro Study to Compare The Repair of old and new silorane Composite Restorations

The elapsed time is considered as an essential factor when some procedures are required on resin composite restorations like repairing, etc.., and the question is whether this factor is going to effect on using silorane resin composite. Twenty silorane based resin composite blocks were prepared (8×8×4)mm, randomly assigned into two groups: the first group 10 blocks, half of each resin block was removed by diamond burs after thermocycles, the second group 10 blocks also half of each resin block was removed by diamond burs after fabrication. All Interfacial surfaces were conditioned by (Cojet™, 3M ESPE). Blocks were restored with silorane resin composite and subjected to thermocycles. Microleakage observed under a stereomicroscope after blocks were immersed in 0.5% basic fuchsin solution for 10 s, and transversely sectioned. Mann-Whitney U test found no statistically significant differences in microleakage between two groups either with fresh silorane resin composite group or aged silorane resin composite group.