title: Mechanical responses of the periodontal ligament based on an exponential hyperelastic model: a combined experimental and finite element method.
abstract: The V-W exponential hyperelastic model is adopted to describe the instantaneous elastic response of the periodontal ligament (PDL). The general theoretical framework of constitutive modeling is described based on nonlinear continuum mechanics, and the elasticity tensor used to develop UMAT subroutine is formulated. Nanoindentation experiment is performed to characterize mechanical properties of an adult pig PDL specimen. Then the experiment is simulated by using the finite element (FE) analysis. Meanwhile, the optimized material parameters are identified by the inverse FE method. The good agreement between the simulated results and experimental data demonstrates that the V-W model is capable of describing the mechanical behavior of the PDL. Therefore, the model and its implementation into FE code are validated. By using the model, we simulate the tooth movement under orthodontic loading to predict the mechanical responses of the PDL. The results show that local concentrations of stress and strain in the PDL are found.
authors: a School of Mechanical Engineering, Southeast University , Nanjing , P.R. China.
authors: Huixiang
authors: H
authors: Huang
authors: a School of Mechanical Engineering, Southeast University , Nanjing , P.R. China.
authors: Wencheng
authors: W
authors: Tang
authors: b School of Stomatology, Nanjing Medical University , Nanjing , P.R. China.
authors: Bin
authors: B
authors: Yan
authors: c School of Mechanical and Electronic Engineering, Nanjing Forestry University , Nanjing , P.R. China.
authors: Bin
authors: B
authors: Wu
authors: b School of Stomatology, Nanjing Medical University , Nanjing , P.R. China.
authors: Dan
authors: D
authors: Cao
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D003198:Computer Simulation; D004548:Elasticity; D020342:Finite Element Analysis; D008422:Materials Testing; D008954:Models, Biological; D017711:Nonlinear Dynamics; D010513:Periodontal Ligament / Q000502:physiology*; D013314:Stress, Mechanical; D034421:Sus scrofa
keywords: finite element simulation; hyperelastic constitutive model; nanoindentation; parameter identification; periodontal ligament