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The time-dependent biomechanical behaviour of the periodontal ligament—an in vitro experimental study in minipig mandibular two-rooted premolars

Papadopoulou, Konstantina ; Keilig, Ludger ; Eliades, Theodore ; Krause, Rolf ; Jäger, Andreas ; Bourauel, Christoph

In: The European Journal of Orthodontics, 2014, vol. 36, no. 1, p. 9-15

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    Titre
    • The time-dependent biomechanical behaviour of the periodontal ligament—an in vitro experimental study in minipig mandibular two-rooted premolars
    Auteur
    • Papadopoulou, Konstantina. Oral Technology, University of Bonn, Germany
    • Keilig, Ludger. Oral Technology, University of Bonn, Germany
    • Eliades, Theodore. Department of Orthodontics and Paediatric Dentistry, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
    • Krause, Rolf. Institute of Computational Science, University of Lugano, Switzerland
    • Jäger, Andreas. Department of Orthodontics, University of Bonn, Germany
    • Bourauel, Christoph. Oral Technology, University of Bonn, Germany
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • The European Journal of Orthodontics, 2014, vol. 36, no. 1, p. 9-15. Oxford University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:294937
    Summary
    The aim of the present work was to evaluate the biomechanical behaviour of the periodontal ligament (PDL) with respect to force development with different controlled loading velocities. For this purpose, an in vitro experimental study was performed on 18 minipig jaw segments. Displacements with variable increasing loading time were applied to one premolar crown of each jaw segment into the linguobuccal direction through a force sensor provided by a specialized biomechanical set-up. The predefined displacement values to be achieved were 0.1 and 0.2 mm. Each of the given displacement increments was applied on the specimens with a linear displacement increase employing the following time spans: 5, 10, 20, 30, 60, 120, 300, 450, and 600 seconds. Force values were measured during load application to register force/displacement diagrams and after the maximum displacement was reached force decay was monitored for a period of 600 seconds. Force/time curves for each tooth were plotted according to the data obtained. Diagrams of the maximum force values obtained from these plots and the force at the end of each measurement were extracted for all teeth. Forces at the point when maximum displacement was reached ranged from 0.5 to 2.5 N for the 0.1 mm activation and showed extreme variation with the specimens. The factor of volume and surface area of the individual roots were evaluated and found not to be responsible for these deviations. A comparable behaviour was recorded for the 0.2 mm deflection, however, on a higher force level. The results show that the force development at different displacement velocities is complex and dominated by the PDL biomechanical characteristics