Table 2 Cumulative fluoride release for specimens with differing levels of nanoparticle substitution at each of 5 time points

7.38 (1.69)^a

27.65 (0.85)^a

85.82 (5.68)^a

119.9 (11.0)^a

154.5 (14.3)^{a, b}

2.61 (1.11)^b

18.59 (3.12)^{a, b}

70.72 (8.40)^a

106.9 (14.1)^a

148.1 (16.6)^a

1.68 (0.73)^b

17.10 (2.33)^b

64.30 (7.68)^a

101.1 (12.2)^a

147.5 (15.7)^a

1.74 (0.70)^b

19.31 (4.32)^{a, b}

82.67 (7.49)^a

124.2 (9.2)^a

181.4 (14.0)^{a, b}

1.83 (0.96)^b

18.73 (9.50)^{a, b}

81.73 (30.22)^a

122.8 (39.3)^a

184.4 (49.8)^{a, b}

2.09 (0.34)^b

23.74 (5.89)^{a, b}

81.73 (13.15)^a

134.6 (19.2)^a

204.4 (23.4)^b