Abstract
To determine the influence of light curing units (LCUs) and material viscosity on the degree of conversion (DC) of bulk-fill (BF) resin-based composites (RBCs) placed in deep cavity preparations. Four LCUs were tested: Valo cordless, Bluephase-G2, Poly wireless and Radii-cal. Light irradiance was determined at 0 mm and 6 mm distance to the reading sensor. The following RBCs were considered: Filtek BF, Filtek BF Flow, Opus BF, Opus BF Flow, Tetric N-Ceram BF and Surefil SDR Flow. Sirius-Z was used with the incremental technique. DC (n = 3) was evaluated by spectroscopy both at top and bottom regions of deep preparations with 6 mm depth. The data were submitted to ANOVA and Tukey’s test (α = 0.05). Pearson’s correlation (95%) was used to verify the relation between the LCUs and the curing potential of RBCs. The DC at 6 mm depth was reduced when Opus BF, Opus BF Flow and Tetric N-Ceram BF were activated with Radii-cal. There was a positive correlation between the LCU irradiance and the bottom/top conversion ratios. The materials’ viscosities did not affect the curing potential. Bulk-fill composites did not present higher curing potential than the conventional composite used with the incremental technique; the most important aspect of the LCU was the irradiance ratio; and the materials’ viscosity did not affect the curing potential as a function of depth. Radii-cal negatively impacted the degree of conversion at 6 mm depth for most bulk-fill resin composites. Depending on the brand, bulk-fill composites may present reduced curing potential due to the light source when placed in deep cavities. Dentists should avoid LCU with acrylic tips to photoactivate bulk-fill resin-based composites.
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Funding
Rodrigo Antonio Modena received MSc scholarship from CAPES/Brazil (Finance code 001). Luis Felipe Schneider receives the Young Scientist of Rio de Janeiro State Scholarship from FAPERJ/Rio de Janeiro/Brazil (E-26/202.735/2018).
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Rodrigo Antonio Modena declares that he has no conflict of interest. Larissa Maria Cavalcante declares that she has no conflict of interest. Mário Alexandre Coelho Sinhoreti declares that he has no conflict of interest. William Palin declares that he has no conflict of interest. Luis Felipe Schneider declares that has received consultant honorarium from DFL Company.
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Modena, R.A., Sinhoreti, M.A.C., Palin, W. et al. Light and viscosity effects on the curing potential of bulk-fill composites placed in deep cavities. Odontology 109, 874–883 (2021). https://doi.org/10.1007/s10266-021-00614-3
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DOI: https://doi.org/10.1007/s10266-021-00614-3