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Cytotoxicity assay of various composites. The viability of L929 cells was determined with the WST-1 reagent after culture with various extracts for 24 h (a), and images of cellular morphology were taken using an inverted microscope (b). Data are presented as the mean ± SD (n = 9) and were analyzed using the nonparametric Kruskal–Wallis H-test. Differences of p < 0.05 were considered statistically significant. (*) denotes a significant difference (p < 0.05).
