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

From: Development of a novel antimicrobial-releasing glass ionomer cement functionalized with chlorhexidine hexametaphosphate nanoparticles

  Cumulative fluoride release [ng.mm-2] (standard deviation in parentheses)
NP substitution [%] 1 h 24 h 8 days 15 days 33 days
0 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
1 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
2 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
5 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
10 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
20 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
  1. Within each time point, superscript letters indicate statistically homogeneous groups, so figures with different superscript letters are statistically significantly different to a 95% confidence level at that time.