Table 1.
Mean and standard deviations of the static friction during sliding tests. Comparison between different types of ligation and duration of intraoral bracket use
| Type of ligation | Force (N) | |||
|---|---|---|---|---|
| New | 12 months | 24 months | P value * | |
| Metallic ligatures 2/4 | 2.64±0.43 | 1.72±0.35 | 1.91±0.47 | n.s. 3 /p<0.05 1,2 |
| Metallic ligatures 4/4 | 1.98±0.26 | 1.95±0.26 | 2.42±0.36 | n.s. 1,2,3 |
| Elastomeric | 4.31±0.27 | 3.70±0.29 | 4.18±0.59 | n.s. 2,3 /p<0.05 1 |
| Slide® | 2.74±0.35 | 1.67±0.19 | 1.51±0.16 | n.s. 3/p<0.05 1,2 |
| P value * | n.s. 6 | n.s. 4,6,8 | n.s. 6 | |
| p<0.05 4,5,7,8,9 | p<0.05 5,7,9 | p<0.05 4,5,7,8,9 |
*
P values were obtained by two way analysis of variance (one way ANOVA) followed by the Bonferroni's post hoc test
n.s.=not significant (p>0.05)
1
New versus 12 months
2
New versus 24 months
3
12 months versus 24 months
4
2/4 versus 4/4
5
2/4 versus Elastomeric
6
2/4 versus Slide®
7
4/4 versus Elastomeric
8
4/4 versus Slide®
9
Elastomeric versus Slide®