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Table 3 Mid-palatal suture 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
Point A 0.004173 −0.006665 0.008415 0.004138 −0.006013 0.005668
Point B 0.004667 −0.004224 0.012245 0.004367 −0.00415 0.010171
Point C 0.004893 −0.002638 0.012336 0.004564 −0.002295 0.011241
Point D 0.005149 −0.001793 0.012932 0.004922 −0.001159 0.012924
  1. Point A point near incisive foramen, Point D point near palatine bone, Points B and C divide the A–D line into three equal parts, X transverse, Y sagittal, Z vertical, + indicates outward, backward and downward displacement