The role of the fluid phase in the viscous response of bovine periodontal ligament
| Autor: | H. W. Anselm Wiskott, Marzio Bergomi, Urs C. Belser, John Botsis, Joël Cugnoni |
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| Rok vydání: | 2010 |
| Předmět: |
medicine.medical_specialty
Materials science Compressive Strength Periodontal Ligament Biomedical Engineering Biophysics In Vitro Techniques Matrix (biology) Models Biological Invitro Viscosity Mechanical-Behavior Solid matrix stomatognathic system Tensile Strength Ultimate tensile strength medicine Animals Periodontal fiber Orthopedics and Sports Medicine Composite material Fluid phase Tension (physics) Hyperelasticity Rehabilitation technology industry and agriculture Compression (physics) Biomechanical Phenomena Body Fluids Surgery Compressive strength Hyperelastic material Cattle Stress Mechanical Model |
| Zdroj: | Journal of Biomechanics. 43:1146-1152 |
| ISSN: | 0021-9290 |
| DOI: | 10.1016/j.jbiomech.2009.12.020 |
| Popis: | The mechanical response of the periodontal ligament (PDL) is complex. This tissue responds as a hyperelastic solid when pulled in tension while demonstrating a viscous behavior under compression. This intricacy is reflected in the tissue's morphology, which comprises fibers, glycosaminoglycans, a jagged interface with the surrounding porous bone and an extensive vascular network. In the present study we offer an analysis of the viscous behavior and the interplay between the fibrous matrix and its fluid phase. Cylindrical specimens comprising layers of dentine, PDL and bone were extracted from bovine first molars and affixed to a tensile-compressive loading machine. The viscous properties of the tissue were analyzed (1) by subjecting the specimens to sinusoidal displacements at various frequencies and (2) by cycling the specimens in 'fully saturated' and in 'partially dry' conditions. Both modes assisted in determining the contribution of the fluid phase to the mechanical response. It was concluded that: (1) PDL showed pseudo-plastic viscous features for cyclic compressive loading, (2) these viscous features essentially resulted from interactions between the porous matrix and unbound fluid content of the tissue. Removing the liquid from the PDL largely eliminates its damping effect in compression. |
| Databáze: | OpenAIRE |
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