Numerical analysis of biomaterial deformation with non-uniform elasticity for maxillofacial palpation by particle method

DOI Web Site 7 References Open Access

Bibliographic Information

Other Title
  • 頭頸部触診のための粒子法による非一様弾性生体変形解析

Abstract

<p>Palpation is an important medical skill to find bad lumps or tumors in the first medical examination. However, the practical palpation training has not been conducted enough to avoid patient’s risk in medical educational institutions. Hence, a virtual reality training system is useful for reproducing various affected parts. In this paper, the particle method to calculate the deformation of biomaterial with non-uniform elasticity is developed for the VR palpation system, which is based on the moving particle semi-implicit method (MPS). The target biological model is a maxillofacial part for dental palpation, which is discretized with 2 mm in particle intervals. In the analysis, we set a local calculation region near the palpation position to reduce computational time. The local region has a spherical lump of 10 mm in diameter. The accuracy of the present calculation is examined through comparing FEM’s one about deformation and stress. Here, we mention that there is hardly a comparison of MPS’s and FEM’s stress for biological tissues. This is because that the definition of pressure in MPS is different from one in FEM. Evaluating the method of stress on the basis of von Mises stress is newly proposed in order to improve the problem. Consequently, the displacement and stress by the present particle method and FEM are qualitatively the same distributions for an example local model with a lump. Furthermore, large elastic deformation is calculated with large palpation pressure. It is clarified that the palpation pressure is about 500 Pa to deform 5mm on the palpation surface. Finally, the particle method can simulate the deformation and stress of the practical maxillofacial model with a lump by the palpation pressures of 400 Pa and 600 Pa. In addition, computer graphics are made to easily understand the maxillofacial surface deformation for a VR system.</p>

Journal

References(7)*help

See more

Related Projects

See more

Keywords

Details 詳細情報について

Report a problem

Back to top