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Table 2 Summarises the values for each cleaning strategy: number of observations, mean grey value and standard deviation

From: Comparative SEM analysis of nine F22 aligner cleaning strategies

Method

Length

Mean

SD

1

5

150.1

9.492

2

5

117.3

7.334

3

5

120.1

11.63

4

5

120.2

14.57

5

5

127.8

17.6

6

5

127.5

12.25

7

5

123

10.28

8

5

119.6

5.865

9

5

80.55

4.232