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