نبذة مختصرة : Objectives: To compare microtensile bond strength (µTBS) and depth of cure (DOC) of bulk fill composites cured by monowave (MW) and polywave (PW) LED units at different curing times. Materials and methods: Three composites were tested: Tetric EvoCeram Bulk Fill (TBF), Filtek Bulk Fill (FBF) and Tetric EvoCeram (T). Flat dentin surfaces treated with adhesive (Adhese, Ivoclar Vivadent) were bonded with cylindrical 4mm bulk composite of each material (n=6) and cured with monowave (Satelec) or polywave (Bluephase Style) curing units at 10s or 20s. After 24 hours, teeth were sectioned in individual 0.9 mm² beams and tested for µTBS. In addition, the DOC (IOS 4090) scrape test was performed (n=5) following the same curing protocols. Two-way ANOVA (=0.05) was performed isolating light curing units. Results: MW light curing unit showed no statistical significant difference in µTBS for all materials and curing times tested. Likewise, the PW light curing unit did not show differences, except for TBF. Overall, bulk fill composites presented greater DOC and longer curing time resulted in higher DOC for all composites. Conclusion: Curing mode does not result in differences in µTBS to dentin. However, bulk fill composites exhibit greater DOC than conventional resin composites. ; Dentistry, Faculty of ; Graduate
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