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Cytotoxicity testing of resins for additive manufacturing. (A) Calcein-AM and PI staining, (B) TOX8 viability assay, and (C) MTT viability assay of MSCs after 4 days of cultivation with direct contact with the different resins. Data are given as mean ± SD (n = 4). * p < 0.05; ** p < 0.01; *** p < 0.001; **** p < 0.0001.
