IADR Abstract Archives
Evaluation of the Simultaneous Photopolymerization Properties of A BPA-Free Fluorinated Composite
Objectives: To investigate the photopolymerization properties (the degree of conversion, DC; polymerization shrinkage stress, PS; and polymerization exotherm, PE) of a novel, bis-phenol A-free, fluorinated urethane dimethacrylate (FUDMA)-based dental resin composite.
Methods: Experimental groups comprised 50/50wt% and 70/30wt% mixtures of FUDMA/TEGDMA, with a micro-sized glass filler (75wt%), composites. Control groups comprised bis-GMA/TEGDMA and UDMA/TEGDMA-based dental composites with same wt% to experimental groups. All groups were photo-polymerized under light irradiance of 500mW/cm2 for the 40s. A cantilever-beam based instrument, in situ coupled with a near infrared spectrometer and a microprobe thermocouple, was used for simultaneous measurement of PS, DC and PE in real-time. The development of polymerization properties was assessed during the first 10 mins after the beginning of irradiation. The peak PE, final PS, and DC results were analyzed using one-way ANOVA followed by the Tukey’s test (α<0.05).
Results: Increase in monomers’ concentration was associated with a decrease in PS and DC values in all groups. FUDMA/TEGDMA composites (50/50wt%, 70/30wt%) demonstrated significantly lower (P<0.05) PS (2.35, 1.67MPa) than both bis-GMA/TEGDMA (2.94, 2.32MPa) and UDMA/TEGDMA (3.02, 2.16MPa)-based composites. The DC of FUDMA/TEGDMA composites (74%, 70%) was significantly higher (P<0.05) than that of bis-GMA/TEGDMA composites (69%, 57%), however, slightly lower (P>0.05) than that of UDMA/TEGDMA composite (75%, 74%). Although the peak PE values of three groups were similar, the polymerization rates varied significantly (P<0.05).
Conclusions: Based on the simultaneous measurements acquired, a new insight into the relationship of kinetics and photo-polymerization properties in composites was provided. The results indicate that FUDMA/TEGDMA-based dental composites possess comparable, and at times improved, polymerization properties compared to conventional dental composites investigated. The preliminary findings of the study demonstrate the potential of the FUDMA resin to substitute bis-GMA in dental restorative applications, with the added advantage of being BPA-free.
Methods: Experimental groups comprised 50/50wt% and 70/30wt% mixtures of FUDMA/TEGDMA, with a micro-sized glass filler (75wt%), composites. Control groups comprised bis-GMA/TEGDMA and UDMA/TEGDMA-based dental composites with same wt% to experimental groups. All groups were photo-polymerized under light irradiance of 500mW/cm2 for the 40s. A cantilever-beam based instrument, in situ coupled with a near infrared spectrometer and a microprobe thermocouple, was used for simultaneous measurement of PS, DC and PE in real-time. The development of polymerization properties was assessed during the first 10 mins after the beginning of irradiation. The peak PE, final PS, and DC results were analyzed using one-way ANOVA followed by the Tukey’s test (α<0.05).
Results: Increase in monomers’ concentration was associated with a decrease in PS and DC values in all groups. FUDMA/TEGDMA composites (50/50wt%, 70/30wt%) demonstrated significantly lower (P<0.05) PS (2.35, 1.67MPa) than both bis-GMA/TEGDMA (2.94, 2.32MPa) and UDMA/TEGDMA (3.02, 2.16MPa)-based composites. The DC of FUDMA/TEGDMA composites (74%, 70%) was significantly higher (P<0.05) than that of bis-GMA/TEGDMA composites (69%, 57%), however, slightly lower (P>0.05) than that of UDMA/TEGDMA composite (75%, 74%). Although the peak PE values of three groups were similar, the polymerization rates varied significantly (P<0.05).
Conclusions: Based on the simultaneous measurements acquired, a new insight into the relationship of kinetics and photo-polymerization properties in composites was provided. The results indicate that FUDMA/TEGDMA-based dental composites possess comparable, and at times improved, polymerization properties compared to conventional dental composites investigated. The preliminary findings of the study demonstrate the potential of the FUDMA resin to substitute bis-GMA in dental restorative applications, with the added advantage of being BPA-free.