PHYSICOCHEMICAL EVALUATION OF A HIGH-OPACITY COMPOSITE RESIN POLYMERIZED WITH DIFFERENT LED LIGHT-CURING UNITS

Elvia Maria Sousa CAMPOS, Davi Iago Sousa dos SANTOS, Ketelyn Kerty Moreira de OLIVEIRA, Karlos Eduardo Rodrigues LIMA, Ruan Carlos Barroso LOPES, Sérgio Lima SANTIAGO, Celiane Mary Carneiro TAPETY, Lidiane Costa de SOUZA

Resumo


Aims: This study aimed to evaluate the physicochemical properties of a high-opacity microhybrid composite resin in shade DA3.5, photoactivated using different LED light-curing units (LCUs). Study design: An experimental in vitro study was conducted to compare the effects of different generations of LED LCUs on the mechanical and chemical behavior of a composite resin. Place and Duration of Study: Research Laboratory of Dental Materials, Graduate Program in Dentistry (PPGO), Federal University of Ceará (UFC) Methodology: Three experimental groups were formed based on the type of LED LCU used: two second-generation devices, G1 (Kondentech) and G2 (Radii-Cal), and one third-generation device, G3 (Valo Cordless Grand). Physical properties were evaluated through flexural strength tests using resin bars (n=10; 12 × 2 × 2 mm), photoactivated according to each group. Knoop microhardness was assessed on cylindrical specimens (n=8; 1 mm thick × 15 mm diameter). Chemical properties were determined by water sorption and solubility tests (n=8). Data were analyzed using one-way ANOVA (α=0.05) followed by Tukey’s post hoc test. Results: No statistically significant differences were found among groups for flexural strength (p=0.183). Microhardness values showed a significant difference only between G3 and G1 (p=0.019). Water sorption (p=0.260) and solubility (p=0.414) did not differ significantly among groups Conclusion: The different LED light-curing units evaluated demonstrated satisfactory performance. No significant differences were observed in the physicochemical properties of the high-opacity microhybrid composite resin tested, indicating consistent polymerization performance across devices.

Keywords: Composite resins. Physical Properties. Mechanical Tests. Curing Lights. Dental.


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Referências


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