Table 1: Effects of fluoride on cell viability in microglial BV-2 cells (the percentage against the control group, %).

NaF (μg/mL)6 h12 h24 h48 h72 h

0100.0 ± 3.6100.0 ± 1.7100.0 ± 0.0100.0 ± 5.1100.0 ± 0.9
1107.7 ± 4.6**100.0 ± 2.195.0 ± 1.0**90.2 ± 3.7**102.2 ± 3.4
5106.8 ± 2.2*98.4 ± 3.596.0 ± 1.0**93.2 ± 3.3*100.2 ± 3.1
10102.6 ± 4.594.5 ± 1.4*94.3 ± 1.6*92.3 ± 1.9*102.2 ± 3.1
25101.4 ± 5.694.8 ± 5.9**91.6 ± 5.4**84.4 ± 5.8**102.7 ± 2.2
50100.2 ± 5.193.9 ± 2.6*87.1 ± 4.2**81.0 ± 5.0**86.4 ± 1.6**
10090.3 ± 1.8**78.1 ± 1.4**70.7 ± 6.2*71.8 ± 7.7**50.2 ± 2.9**

−0.517−0.766−0.809−0.826−0.684
0.0020.0000.0000.0000.000

: the correlation coefficients; : values; compared with 0 μg/mL group; compared with 0 μg/mL group.