IADR Abstract Archives
Dual-Cure, Flowable and Bulk-Fill Materials: Comparison of Degree of Conversion
Objectives: Manufacturers continue to produce materials which simplify and shorten placement time of dental bonding agents and restorative materials, including Bulk-fill composite restoratives. A challenge with bulk-fill materials is adequate polymerization throughout the material. Dual-cure polymerization strategies of such materials may improve Degree of Conversion (%DC) compared to light-cure or auto-cure materials. This study compared %DC of dual-cure bulk-fill material to light-cured flowable and bulk-fill composites.
Methods: Three samples of each material were placed in 4mm deep molds and tested for DC (iS50 FT-IR, ThermoFisher Nicolet, Waltham, MA) ) prior to, immediately after photopolymerization following manufacturer’s recommendations, and at 10 minutes post-curing. See Table 1. Tetric Power Fill was cured at 2750 mW/cm2 for 3 seconds, whereas all other groups were cured at 1150 mW/cm2 for 20 seconds, using the same curing light (Bluephase PowerCure, Ivoclar Vivadent, Amherst, NY).. The BEZ DC group was light cured after 120 seconds of auto curing. Statistical comparisons was made ANOVA with a post-hoc Tukey test (α=0.05)
Results: All groups tested had an increase in %DC at 10 minutes from initial cure. Highest %DC was seen with the dual-cure material at both time points. Power cure materials had similar %DC to conventional light-cured materials.
Conclusions: As tested in this study, all groups had clinically acceptable degree of conversion. Shortened curing times with the power-cure may provide clinicians with time savings, however the additional time spent with dual-cure materials may ultimately yield restorations with increased longevity.
Methods: Three samples of each material were placed in 4mm deep molds and tested for DC (iS50 FT-IR, ThermoFisher Nicolet, Waltham, MA) ) prior to, immediately after photopolymerization following manufacturer’s recommendations, and at 10 minutes post-curing. See Table 1. Tetric Power Fill was cured at 2750 mW/cm2 for 3 seconds, whereas all other groups were cured at 1150 mW/cm2 for 20 seconds, using the same curing light (Bluephase PowerCure, Ivoclar Vivadent, Amherst, NY).. The BEZ DC group was light cured after 120 seconds of auto curing. Statistical comparisons was made ANOVA with a post-hoc Tukey test (α=0.05)
Results: All groups tested had an increase in %DC at 10 minutes from initial cure. Highest %DC was seen with the dual-cure material at both time points. Power cure materials had similar %DC to conventional light-cured materials.
Conclusions: As tested in this study, all groups had clinically acceptable degree of conversion. Shortened curing times with the power-cure may provide clinicians with time savings, however the additional time spent with dual-cure materials may ultimately yield restorations with increased longevity.
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