Repair on silorane-based composite

Resumo

Silorane-based composites have low polymerization
shrinkage and good color stability. However, the effectiveness and
the best surface treatment to carry out repairs to this type of
restoration is unclear. Objective: To evaluate the effect of different
types of repair made on a silorane-based composite. Material and
methods: 80 disks of silorane-based composite were prepared (Filtek
P90, 3M ESPE) and divided into eight groups (n = 10), according
to the surface treatment being carried out before repairs of either
the same silorane composite or a dimethacrylate material (Filtek
Z350, 3M ESPE) were conducted. In two groups the immediate
adhesion without repair (positive control) was evaluated. In other
two groups repairs without any surface treatment (negative control)
were evaluated. Surface treatments before the repair of the four
remaining groups included the application of adhesive systems
specific to silorane (Silorane System Adhesive, 3M ESPE) or to
dimethacrylate (Adper Single Bond 2, 3M ESPE) and roughening
followed by application of adhesive system. All groups were stored
into distilled water at 37°C for 1 week prior to the microshear
bond strength evaluation. Results: The group immediate adhesion
silorane-dimethacrylate and group repair silorane-dimethacrylate without surface treatment showed lower microshear bond strength
values and were statistically different from groups with surface
treatment and immediate adhesion silorane-silorane (p < 0.05).
Conclusion: Surface treatments with application of adhesive systems
compatible with the repair material or roughening prior to the
application of these adhesive systems are suitable for repairing
silorane-based composites.