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Influence of Curing Time on the Microbiological Behavior of Bulk-Fill Nanohybrid Resin Composites. | LitMetric

AI Article Synopsis

  • This study investigated how curing time affects the surface properties and bacteria interaction of three types of bulk-fill resin-based composites (RBCs) by controlling light exposure during the curing process (10 vs. 80 seconds).
  • Various surface characteristics (like roughness and energy) and microbiological behavior (like bacterial adherence and biofilm formation) were measured, revealing that longer curing times resulted in lower bacterial adherence across all materials tested.
  • The findings suggest that prolonged curing not only improves the performance of bulk-fill materials compared to conventional RBCs, but that the differences in surface properties may not directly correlate with microbial behavior, which could impact the risk of secondary caries and the durability of dental restorations.

Article Abstract

This in vitro study aimed to evaluate the influence of curing time on surface characteristics and microbiological behavior of three bulk-fill resin-based composites (RBCs). Materials were light-cured for either 10 s or 80 s, then finished using a standard clinical procedure. They were characterized by surface morphology (SEM), surface elemental composition (EDS), surface roughness (SR), and surface free energy (SFE). Microbiological behavior was assessed as adherence (2 h) and biofilm formation (24 h) using a continuous-flow bioreactor. Statistical analysis included a two-way ANOVA and Tukey's test ( < 0.05). Materials differed substantially as filler shape, dimension, elemental composition and resin matrix composition. Significant differences between materials were found for SR, SFE, and microbiological behavior. Such differences were less pronounced or disappeared after prolonged photocuring. The latter yielded significantly lower adherence and biofilm formation on all tested materials, similar to conventional RBCs. Improved photoinitiators and UDMA-based resin matrix composition may explain these results. No correlation between surface characteristics and microbiological behavior can explain the similar microbiological behavior of bulk-fill materials after prolonged photocuring. This different performance of bulk-fill materials compared with conventional RBCs, where surface characteristics, especially surface chemistry, influence microbiological behavior, may have important implications for secondary caries occurrence and restoration longevity.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8434565PMC
http://dx.doi.org/10.3390/polym13172948DOI Listing

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