Abstract
Objective: To evaluate the coesival strength of resin repairs using silane as a bonding agent. Methods: 48 blocks of composite resin for dentin in color A3.5 measuring 8 x 8 x 4 mm were sequenced and divided into 4 groups, in which G1 = total-etch adhesive; G2 = 37% phosphoric acid+conventional adhesive; G3 = Phosphoric acid 37%+silane+total-etch adhesive; G4 = 37% phosphoric acid+universal adhesive. After that, the blocks were restored with a clear composite resin, 24 being immediately after the block was made and 24 after preservation in 24 hours distilled water. The specimens were submitted to microtensile test before and after artificial aging for 5000 cycles of thermocycling. The materials used in the study were analyzed in a Micro-Raman spectroscopy. Results: The groups containing silane presented better results in the microtensile test when compared to the groups without silane addition (P< 0,05). In the Micro-Raman spectroscopy, the silane and the universal adhesive presented increased Si-O-Si peaks when compared to the total-etch adhesive. Conclusions: It can be concluded that the presence of silane interferes positively in repairs of composite resins.