Table 4 Dento-alveolar displacement (mm) after activation of quad-helix and NPE2

Lingual marginal ridge of central incisor

0.005346

−0.005947

0.008094

0.005254

−0.005312

0.00549

Lingual marginal ridge of lateral incisor

0.006913

−0.004625

0.006239

0.006758

−0.004031

0.003674

Lingual marginal ridge of first permanent molar

0.017585

−0.000169

0.003302

0.015673

−0.000006

0.00233

Central incisor cusp tip

0.003598

−0.006677

0.008102

0.003688

−0.005642

0.005067

First permanent molar mesiobuccal cusp tip

0.021027

0.001396

0.005404

0.020318

0.001291

0.007759

Erupting canine cusp tip

0.00872

0.001526

0.005405

0.008523

0.002276

0.001431

Erupting second molar mesiobuccal cusp tip

0.01962

0.000524

0.002048

0.017849

0.000452

0.003237