Methods: Thirty truncated cones of Grandio SO (VOCO) were prepared and thermo-cycled for 5000 cycles for artificial aging. Specimen’s surface were sandblasted with aluminum oxide, cleaned with air/water spray and conditioned with phosphoric acid for 15s. After that, one coat of Admira Bond Adhesive (VOCO) was applied and light cured for 20s. Specimens were divided into 3 groups according to the repair material used (n=10): Conventional Resin – Grandio SO (R), A thin layer of Flowable resin – Grandio SO Heavy Flow + conventional Resin (FR) and Flowable resin (F). Over the original specimens, a sectional cone-shape teflon matrix was hold in position , and the cones were built, according the groups described above. Another thirty specimens were built, 10 of each group, simulating a restoration without repair. Specimens were submitted to tensile stress in a universal testing machine. Data were recorded in MPa and evaluated with ANOVA, Tukey´s and non-paired “t’’ tests.
Results:
ANOVA showed significant differences between groups which were performed repair (p<0.00). The results of Tukey´s test for these groups were: R (19.89±5.31)ab, F+R (14.49±5.59)a, F (20.91±3.99)b. The groups followed by the same letter did not show statistical differences. Non-paired “t” test showed that groups R and F repairs were similar of the correspondent groups which simulated a restoration without repair.
Conclusions: The repair with conventional or flowable composite produced bond strength values similar to cohesive strength of the same materials. The use of a thin layer of flowable resin as an intermediate agent in composite repair decreased the bond strength when compared the same method for restoration.