Biomechanical Effects of Various Bone-Implant Interfaces on the Stability of Orthodontic Miniscrews: A Finite Element Study

Table 3

Anisotropy elastic coefficients for cortical and trabecular bone^a.

	E1	E2	E3	G12	G13	G23	ν12	ν13	ν23
Cortical bone^b	12.5	17.9	26.6	4.5	5.3	7.1	0.18	0.31	0.28
Trabecular bone^c	0.21	1.148	1.148	0.068	0.068	0.434	0.055	0.055	0.322

^abcE_i represents Young’s modulus (GPa); G_ij represents shear modulus (GPa); ν_ij represents Poisson’s ratio; the 1-direction is radial, the 2-direction is tangential (circumferential), and the 3-direction is axial (longitudinal); the 1-direction is inferosuperior (the axis of transverse isotropy symmetry with the smallest of Young’s modulus value), the 2-direction is mediolateral, and the 3-direction is anteroposterior.