Skip to main content

Advertisement

Table 5 Stress distribution (MPa) at the maxillofacial sutures and landmarks after activation of the quad-helix and NPE2 appliance

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
Mid-palatal suture   
 Point A 0.317823 0.317135
 Point B 0.969081 0.786962
 Point C 2.433233 1.896292
 Point D 0.000522 0.00446
Maxillofacial landmarks   
 Point A 0.434458 0.409881
 ANS 0.060478 0.059042
 PNS 0.022241 0.01746
 Maxillary tuberosity 0.252454 0.189975
 Pterygoid hamulua 0.429192 0.375754
 Infra-orbital rim 1.029457 0.976392
 Frontal process of zygomatic bone 0.502464 0.460146
 Maxillary process of zygomatic bone 0.55113 0.509731
 Temporal process of zygomatic bone 1.053598 0.9987
 Lateral nasal wall 1.219208 1.165219
 Inferior nasal floor 0.095343 0.100366
 Lateral pterygoid plate 0.21982 0.200389
 Fronto-maxillary suture 0.000932 0.000812
 Zygomaticomaxillary suture 0.005582 0.005473
 Fronto-zygomatic suture 0.075531 0.067953
 Fronto-nasal suture 0.020907 0.017968
 Zygomatico-temporal suture 0.039584 0.03841
 Pterygo-maxillary suture 0.012675 0.007898
 Inter-nasal suture 0.06921 0.071998
 Naso-maxillary suture 0.002441 0.002493
  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