From: The effect of vertical bracket positioning on torque and the resultant stress in the periodontal ligament—a finite element study
Young's modulus (MPa)
Poisson's ratio
Enamel
84,100
0.33
Dentin
18,600
0.30
Alveolar bone
490
Cortical bone
14,700
PDL
0.1
0.45
Stainless steel
200,000
Composite
2,140
0.31