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Table 3 Results of stiffness tests

From: Evaluation of the stiffness characteristics of rapid palatal expander screws

Type Activations Number Mu SD
2B 1 3 37 14.6
2B 2 3 96 24.7
2B 3 3 147 46.6
2B 4 3 183 61.3
2B 5 3 224 59.9
2B 6 3 256 49.7
2B 7 3 275 34.0
2B 8 3 282 11.0
2B 9 3 286 8.2
2B 10 3 284 20.7
2B 11 3 278 17.1
2B 12 3 271 19.7
2B 13 3 280 12.0
2B 14 3 275 14.1
2B 15 3 265 4.2
4B 1 7 24 6.6
4B 2 7 44 11.6
4B 3 7 66 18.0
4B 4 7 86 26.2
4B 5 7 103 32.9
4B 6 7 118 36.8
4B 7 7 131 39.2
4B 8 7 141 40.1
4B 9 7 151 41.6
4B 10 7 158 40.9
4B 11 7 164 42.2
4B 12 7 165 45.4
4B 13 7 158 42.8
4B 14 7 160 41.3
4B 15 7 162 41.5
4B 16 7 163 40.6
4B 17 7 164 41.2
4B 18 7 164 40.8
4B 19 7 164 40.4
4B 20 7 162 39.8
4B 21 7 162 38.6
4B 22 7 174 30.7
4B 23 7 172 29.2
4B 24 7 149 6.4
4B 25 7 149 6.8