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An elastic-viscoplastic model for excised facial tissues
M B Rubin1, S R Bodner, N S Binur
1Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa, Israel.
Journal of Biomechanical Engineering
|July 21, 1999
Summary
The Superficial Musculoaponeurotic System (SMAS) provides a firmer elastic foundation for the more viscous facial skin. This understanding is crucial for modeling facial tissue mechanics and surgical procedures.
Area of Science:
- Biomedical Engineering
- Tissue Mechanics
- Constitutive Modeling
Background:
- Facial tissues exhibit complex elastic and inelastic behaviors.
- Understanding these properties is vital for reconstructive surgery and biomechanical modeling.
Purpose of the Study:
- To model the nonlinear elastic and rate-dependent inelastic responses of facial skin and Superficial Musculoaponeurotic System (SMAS).
- To compare the mechanical properties of skin and SMAS.
Main Methods:
- Modified unified constitutive equations for elastic-viscoplastic materials.
- Experimental modeling of excised facial tissues (skin and SMAS).
Main Results:
- Skin is more strain rate dependent and has greater elastic nonlinearity than SMAS.
- Both tissues show hardening effects, reducing time dependence and increasing the elastic range, more so in SMAS.
- SMAS acts as a firmer elastic foundation for the more viscous skin.
Conclusions:
- The SMAS provides a stable elastic base for the facial skin.
- Short skin relaxation times suggest it conforms to SMAS deformation when attached.
- Findings are relevant for procedures where skin-SMAS separation is undesirable.