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
Young’s modulus (Newton/mm2)
Poisson’s ratio
Tooth [10]
2.07 × 104
0.30
Cortical bone [10]
1.37 × 104
Cancellous bone [10]
7.9 × 103
Suture [10]
7
0.40
Periodontal ligament [10]
50
0.49
Stainless steel [11]
2.1 × 105
0.3
Nickel titanium [12]
44 × 103
0.33
