Resumo (EN)
Introduction - The bone morphogenetic protein has been found in bone formation after fracture, acting as bone neoformation inductor. The aim of this study was to evaluate the microleakage composite restoration in dentin surface treated with bone morphogenetic protein associated with Nd:YAG laser irradiation. Material and Method - Fifty-two bovine teeth were divided in three groups. Each tooth received Class V restoration, with standard measurements of depth and width. In all groups the conventional treatment of composite restoration were the same. The Group / was a control group, with conventional adhesive and restoration procedures. In the Group II the dentin was treated with BMP + hydroxyapatite + colagen, irradiation with Nd:YAG laser, adhesive technique and composite restoration. In the Group Ill the dentin was treated with BMP (+ hydroxyapatite + colagen) + NOYAG + adhesive technique + another Nd:YAG laser irradiation + composite restoration. In the Group IV the dentin was treated only with hydroxyapatite, irradiation with Nd:YAG laser, adhesive technique and composite restoration. The samples were submitted to a microleakage test. Results - After three different evaluations the Fisher test was concluded. The association of Nd YAG laser after and before application of BMP decreased the microleakage when compared with the control group. Conclusion - The association of Nd:YAG laser and BMP promote a lower microleakage in composite Class V restorations.