The role of the fluid phase in the viscous response of bovine periodontal ligament |
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| Authors: | Marzio Bergomi Joël Cugnoni John Botsis Urs C. Belser H.W. Anselm Wiskott |
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| Affiliation: | 1. Laboratoire de Mécanique Appliquée et D''analyse de Fiabilité, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland;2. Division of Fixed Prosthodontics, Faculty of Medicine, University of Geneva, 1205 Geneva, Switzerland;3. Laboratory of Biomaterials, Faculty of Medicine, University of Geneva, 19, Barth-Menn, 1205 Geneva, Switzerland;1. Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Pusan National University, Yangsan, Korea;2. Department of Conservative Dentistry, School of Dentistry, Kyungpook National University, Daegu, Korea;3. Department of Conservative Dentistry, School of Dentistry, Seoul National University, Seoul, Korea;1. Department of Orthodontics, Tehran University of Medical Sciences, Tehran, Iran;2. Department of Orthodontics, Hiroshima University, Hiroshima, Japon;1. School of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Katz Group, Rexall Place, Edmonton, AB, Canada T6G 2E1;2. Division of Oral Pathology, Department of Pathology, Faculty of Medicine and Dentistry, University of Western Ontario, London, Ont., Canada;2. Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania;3. Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts;4. Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania;5. Department of Structural Biology, University of Pittsburgh, Pittsburgh, Pennsylvania;1. Postgraduate student, State Key Laboratory of Oral Diseases and Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China;2. Resident, Department of Orthodontics, Stomatological Hospital of Nanjing, School of Stomatology, Nanjing University Medical Center, Nanjing University, Nanjing, China;3. Lecturer, State Key Laboratory of Oral Diseases and Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China;4. Professor, State Key Laboratory of Oral Diseases and Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China;1. Department of Obstetrics and Gynecology, University Clinic Magdeburg, Magdeburg, Germany;2. Department of Obstetrics and Gynecology, University Medical Center Regensburg, Regensburg, Germany |
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| Abstract: | 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. |
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