Comparison effect of exposure-time (24 vs 72 h) of 1-, 3- and 7-day extracts of Coe-Pak and Reso-Pac on cell viability and one another: A = human gingival fibroblast (HGF); B = human osteoblast-like cell (Saos-2).
No significant differences were seen between 24 h and 72 h exposure in all experimental groups (P < 0.05) (no time-dependent cytotoxicity).
NC = negative control (no cytotoxicity, 100% viability); PC = positive control (cytotoxicity, viability ≤ 10%).