Table 1 Statistical comparison between the different expansion screws at the different numbers of activations (1 activation is equivalent at ¼ of turn)
From: Evaluation of mechanical properties of three different screws for rapid maxillary expansion
A2620 (1) | Hyrax (2) | Palatal split screw (3) | Statistical comparisons (p<0.05; test di Kruskal-Wallis) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
Med. | 25% | 75% | Med. | 25% | 75% | Med. | 25% | 75% | ||
1 activation (1) | 23.4 | 18.2 | 27.4 | 21.8 | 6.5 | 22.7 | 15.9 | 14.5 | 18.0 | 1vs3 |
5 activations (5) | 100.3 | 65.1 | 122.4 | 86.6 | 81.5 | 109.8 | 56.6 | 53.8 | 61.1 | 1vs3; 2vs3 |
10 activations (10) | 170.4 | 145.9 | 181.2 | 150.8 | 146.3 | 179.6 | 103.2 | 101.7 | 104.0 | 1vs3; 2vs3 |
15 activations (15) | 202.9 | 196.7 | 209.3 | 182.6 | 179.8 | 209.6 | 135.6 | 126.7 | 137.7 | 1vs3; 2vs3 |
20 activations (20) | 215.0 | 210.7 | 217.2 | 197.9 | 193.8 | 221.0 | 157.8 | 143.0 | 159.8 | 1vs3; 2vs3 |
Significant statistical comparisons (p<0.05; test di Friedman) | 1vs10; 1vs15; 1vs20; 5vs15;5vs20; 10vs20 | 1vs10; 1vs15; 1vs20; 5vs15;5vs20; 10vs20 | 1vs10; 1vs15; 1vs20; 5vs15;5vs20; 10vs20 | |||||||