Aim:The aim of this study was to investigate in vitro the bond strength of composite resins on enamel previously treated with whitening strips. Materials and methods:A total of 48 bovine incisors were allocated to four experimental groups (n = 12 each): G1 (WSC)-treated with 9.5% hydrogen peroxide whitening strips (3D White Whitestrips ® Advanced Vivid/CREST); G2 (WSO)-treated with 10% hydrogen peroxide whitening strips (3D WhiteTM/Oral B); G3 (WG)-treated with 7.5% hydrogen peroxide gel with fluorine, calcium and potassium nitrate (White Class ® /FGM); and G4 (C)-control not subjected to bleaching treatment. The specimens were subjected to bleaching over 2 weeks following the manufacturers' instructions. Following the elaboration of the composite resin test specimens, the samples were stored in artificial saliva and subsequently subjected to the microshear test using the universal testing machine (EMIC ® ). The bond strength values were analyzed by one-way ANOVA and Tukey's statistical test (5%).Results: Significant differences were observed among the investigated groups (p < 0.05). The G3-WG exhibited greater values compared with the control group and the groups treated with strips, G1-WSC and G2-WSO. Analysis of the bond interface revealed that a large fraction of the failures occurred at the enamel-resin interface. Can Whitening Strips interfere with the Bond Strength of Conclusion:The bond strength decreased following 14 days of treatment with bleaching strips, whereas the whitening gel with 7.5% hydrogen peroxide, calcium and fluorine increased the bond strength.

Full arch implant-supported prostheses following Branemark protocol are widely used for oral rehabilitation of people with edentulous jaws and associated to the full upper conventional prosthesis. Their indication requires that the dental surgeon be prepared for prosthetic-surgical approach and planning. Therefore, this work aims to present the planning and execution of a lower arch implant-supported immediate-load prosthesis associated to a conventional upper prosthesis through a clinical case report. Previous planning on the installation of the implants aims at the proper fixation after defining the prosthesis design. Predictability of results and patient satisfaction demonstrate how important this planning is. KeywordsDental implants, immediate load on dental implant, prostheses and implants Correspondence