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Progress in Orthodontics

Table 4 Correlation of width and inter-bracket distance L with friction

From: Frictional resistance exerted by different lingual and labial brackets: an in vitro study

Group

Mean friction

Mean width

Mean distance L

Lower lingual

Pearson correlation

.339

-.404

Sig. (two-tailed)

.144

.078

n

20

20

Lower labial

Pearson correlation

.306

-.164

Sig. (two-tailed)

.249

.544

n

16

16

Upper lingual

Pearson correlation

.179

-.405

Sig. (two-tailed)

.451

.077

n

20

20

Upper labial

Pearson correlation

.609-

-.606-

Sig. (two-tailed)

.012

.013

n

16

16

  1. Significant correlation only in Upper lingual group; statistical tendency between distance L and friction in both lingual groups (p < 0.05); with an increase in the value of width, friction increases r = 0.61, p < 0.05 (n = 16); with a decrease in the value of distance L, friction increases r = -0.61, p < 0.05 (n = 16).
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