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.

In-vitro Study to Compare Repairing Resin Composite Restorations Using two Different Types

Resin based composite considers substantially as a restorative material in clinic. Dentists concern in placement resin composite restorations with Long term survival. Materials and Methods: 20 Non carious human third molars, class I cavity was prepared in every molar, restored with methacrylate resin composite Tetric EvoCeram. The restored teeth were subjected to thermocycles. Specimen was randomly divided into two groups : the first group 10 restorations, were repaired by Cojet® (3M ESPE, Germany) and restored by Filtek™ P90, the second group 10 restorations also repaired by Cojet ® but restored by Filtek™ Z350 XT. After that all teeth were subjected to thermocycles again, later immersed in 0.5% basic fuchsin solution for 1 s. The teeth were transversely sectioned and observed under a stereomicroscope. The degree of dye penetration was recorded and analyzed. Results: No statistically significant differences in microleakage were observed between two groups either with low shrinkage Silorane resin composite or methacrylate resin composite