Journal of Conservative Dentistry
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Year : 2015  |  Volume : 18  |  Issue : 3  |  Page : 242-246

Influence of surface treatments to repair recent fillings of silorane-and methacrylate-based composites

1 Departments of Prosthodontics and Periodontics, Restorative Dentistry, Campinas State University, Campinas, São Paulo, Brazil
2 Department of Restorative Dentistry, Veiga de Almeida University, Rio de Janeiro, Brazil

Correspondence Address:
Dr. Ataís Bacchi
Piracicaba Dental School, University of Campinas - Prosthodontics and Periodontics, Av. Limeira, 901 Piracicaba, São Paulo - 13414-903
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0707.157265

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Purpose: The aim of this study was to evaluate the tensile bond strength (TBS) of repairs in recent fillings of methacrylate- (MBC) or silorane-based composites (SBC) subsequent to different surface treatments. Materials and Methods: Fifty slabs of Filtek P60 (3M ESPE, St Paul, USA) and Filtek P90 (3M ESPE) were stored for 10 days in distilled water at 37°C. The surface of adhesion was abraded with a 600-grit silicone paper and repaired using each respective composite: G1, no treatment (control); G2, application of adhesive; G3, application of silane and adhesive; G4, sandblasting (Al2O3) and adhesive; and G5, sandblasting (Al2O3), silane, and adhesive. Further 10 slabs of each composite were also evaluated for cohesive strength (G6). After 30 days immersion in distilled water at 37°C, the TBS was determined. Results: TBS results were higher for MBC than for SBC (P = 0.00012). The experimental groups were similar for SBC and the TBS was 27% of its cohesive strength. For P60, sandblasting significantly improved the TBS compared to other groups. With MBC, G4 and G5, the TBS was approximately 47% of its cohesive strength. Conclusion: Sandblasting (Al2O3) improves the repair-strength of MBC, whilst for the SBC all treatments succeed. MBC presents higher repair strength than SBC.

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