BOND STRENGTH EVALUATION OF DIRECT AND INDIRECT COMPOSITE RESTORATIONS
Keywords:
Shear bond strength, Flow resin, CementAbstract
The purpose of this study was to evaluate the bond strength of direct or indirect composite restorations to dentine. Thirty bovine teeth were flattened in order to obtain a plain dentine area. The teeth were divided in 3 groups of 10, according to the restoration fixing method: 1) Direct technique using Single Bond Adhesive System; 2) Indirect technique using Rely-X resin cement; 3) Indirect technique using high viscosity Filtek Flow composite. For group 1, Z- 250 composite discs were fixated (6mm diameter by 2 mm height) directly on the treated area. For groups 2 and 3, composite discs were made 24 hours before being cemented, with the same dimensions of group 1, and according to the Rely-X (group 2) and Filtek Flow (group 3) manufacturer’s recommendations. After 24h of water storage, the specimens were submitted to a shear bond test on Instron at a speed of 0.5 mm/min. The data were submitted to ANOVA and Tukey’s test (5%). Filtek Flow (6.81MPa) had a significantly lower bond strength mean than Rely-X (10.18MPa) and Single Bond (13.16MPa), which did not differ significantly from each other. The indirect technique showed similar or worse results than the direct restoration technique, which is dependent on the material used for fixation.
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