Experimental and Numerical Modeling of Screws Used for Rigid Internal Fixation of Mandibular Fractures

Table 2

Material properties used in FEA of the mandible. Orthotropic properties were used for cortical bone, while isotropic properties were used for cancellous bone, dentin, and the titanium plate. The x-direction is along the length of the mandible, the y-direction is normal to the bone plane, and the z-direction is their cross product.

Material properties	Symphysis	Parasymphysis	Angle	Ramus	Condyle	Coronoid	Cancellous	Dentin	Titanium
𝐸𝑥 (MPa)	20 492	21 728	23 793	24 607	23 500	28 000	7 930	17 600	110 000
𝐸𝑦 (MPa)	12 092	12 700	12 757	12 971	12 650	14 000	7 930	17 600	110 000
𝐸𝑧 (MPa)	16 350	17 828	19 014	18 357	17 850	17 500	7 930	17 600	110 000
ν xy	0.43	0.45	0.41	0.38	0.32	0.28	0.3	0.34	0.34
ν yz	0.22	0.2	0.22	0.23	0.25	0.28	0.3	0.34	0.34
ν xz	0.34	0.34	0.3	0.28	0.24	0.23	0.3	0.34	0.34
𝐺𝑥𝑦 (MPa)	5 317	5 533	5 493	5 386	5 500	5 750	3 050	6 567	41 045
𝐺𝑦𝑧 (MPa)	4 825	5 083	4 986	5 014	5 150	5 300	3 050	6 567	41 045
𝐺𝑥𝑧 (MPa)	6 908	7 450	7 579	7 407	7 150	7 150	3 050	6 567	41 045