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

From: A comparison of three-dimensional stress distribution and displacement of naso-maxillary complex on application of forces using quad-helix and nickel titanium palatal expander 2 (NPE2): a FEM study

  Quad-helix NPE2
  X Y Z X Y Z
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
  1. X transverse, Y sagittal Z vertical, + indicates outward, backward and downward displacement