STUDY ON THE CONSTITUTIVE MODEL OF PERIODONTAL LIGAMENT BASED ON FINITE ELEMENT METHOD

The Finite element models of a patient’s maxillary center incisor and attached dental tissue are built with a reverse engineering method. The volumetric compression test data are obtained though a group of human experimental data and two widely used Poisson’s ratios. So two groups of Ogden modal parameters are obtained through experiment data fitting, and two groups of parameters of a hypoelastic model are obtained from experimental data transformation. Applied with the same boundary condition, finite element simulations of human experiments are conducted with two hyperelastic, two hypoelastic and two linear elastic constitutive models of periodontal ligament respectively. Comparisons are made between the stress fields as well as the strain fields obtained with each constitutive modal, and also between the derived tooth displacements and experimental data. The results show that tooth displacements derived from the Ogden model and hypoelastic model are very close to the experimental data. However, the displacements derived with linear elastic modals are hardly to coincide with the experiment data. These stress filed in periodontal ligament obtained with each constitutive modal are different from each other.