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Simulation of the aging face.

E Mazza1, O Papes, M B Rubin

  • 1Institute of Mechanical Systems, ETH Zentrum, 8092 Zurich, Switzerland. edoardo.mazza@imes.mavt.ethz.ch

Journal of Biomechanical Engineering
|July 28, 2007
PubMed
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This study models facial aging due to gravity using a finite element program, simulating soft tissue descent over 30 years. The model incorporates tissue aging and nonlinear mechanical behavior for realistic facial deformation analysis.

Area of Science:

  • Biomechanical Engineering
  • Computational Anatomy

Background:

  • Human facial structure exhibits complex nonlinear mechanical behavior.
  • Aging leads to progressive soft tissue descent, influenced by gravity and physiological changes.

Purpose of the Study:

  • To develop and validate a three-dimensional finite element program simulating the nonlinear mechanical behavior of an aging human face.
  • To model progressive gravimetric soft tissue descent over time.

Main Methods:

  • A multilayered composite model of facial tissues with distinct mechanical properties was used.
  • Incorporated elastic-viscoplastic behavior for short-term response and an aging function for long-term stiffness loss.
  • Simulated 30 years of gravitational force exposure to analyze tissue deformation and stress distribution.

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Main Results:

  • Demonstrated the feasibility of using constitutive relations for nonlinear elastic-viscoplastic facial soft tissues in 3D finite element analysis.
  • Calculations showed deformations and stress distributions in soft tissue layers due to long-term gravitational effects.
  • The proposed aging function yielded physically plausible long-term responses.

Conclusions:

  • The finite element program effectively simulates nonlinear mechanical behavior and aging-related soft tissue descent in the human face.
  • Further development could lead to clinical applications in facial analysis and treatment.
  • Quantitative validation requires experimental data to refine the aging function.