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Updated: Aug 6, 2026
Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
Published on: July 3, 2020
Effect of Combined Mechanical and Thermal Cycling on Adhesion of a New Self-Cure Bulk-Fill Composite
Bruna Perazza1, Érika Mayumi Omoto1, Anderson Catelan1
1Department of Restorative Dentistry and Endodontics, São Paulo State University (UNESP), School of Dentistry, Araçatuba, São Paulo, Brazil.
Objective:
This study aimed to evaluate the adhesive performance of a new self-cure bulk-fill restorative system compared with conventional and light-cured bulk-fill resin composites after mechanical and thermal cycling.
Materials And Methods:
Sixty molars were prepared for Class I cavities and restored according to the restorative systems from each group. After 24 h of storage, 30 specimens were sectioned to obtain rectangular sticks (0.9 ± 0.1 mm2), which were submitted to microtensile bond strength testing. The remaining specimens were submitted to mechanical cycling; subsequently, beams were thermocycled and tested. Three beams from each group were subjected to nanoleakage testing to obtain illustrative images. Two-way ANOVA and Tukey's post hoc tests were performed, with a significance level of 5%.
Results:
No difference on bond strength was observed among groups after 24 h (p > 0.05). Although all restorative systems showed adhesion reduction, self-cure bulk-fill resin composite showed higher values compared to other resin composites after cycling (p < 0.05). Nanoleakage images revealed a continuous adhesive interface between the self-cure bulk-fill composite and dentin, which was maintained after cycling.
Conclusions:
New self-cure bulk-fill resin composite showed initially similar adhesive performance to other restorative systems; however, it demonstrated superior adhesion after mechanical and thermal aging.
