Functional state of the mandible and rolling–gliding characteristics in the TMJ |
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Authors: | Dietmar Kubein-Meesenburg Jochen Fanghnel Dankmar Ihlow Ulrich Lotzmann Wolfram Hahn Kirsten M Thieme Peter Proff Tomas Gedrange Hans Ngerl |
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Institution: | aDepartment of Orthodontics, University of Göttingen, Robert-Koch-Straße 40, D-37099 Göttingen, Germany;bDepartment of Oral Anatomy, University of Greifswald, Rotgerberstraße 8, D-17487 Greifswald, Germany;cDepartment of Prosthetic Dentistry, University of Marburg, Georg-Voigt-Straße 3, D-35033 Marburg, Germany;dDepartment of Orthodontics, University of Greifswald, Rotgerberstraße 8, D-17487 Greifswald, Germany |
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Abstract: | For the physiological intact stomatognathic system, the three main functional states (occlusal articular functions, free mandibular movements, and ideal bolus function) were biomechanically discussed concerning the structure of movement, rolling–gliding characteristics, and force transfer in the temporomandibular joint (TMJ). In all three cases, rolling is not possible in the TMJ since the instantaneous rotational axis is positioned outside of the joint – rolling is not necessary because the TMJ is not loaded by appreciable forces. In the aged stomatognathic system with a lost discus and considerable loads in the TMJ, however, the attrition of the joint is eased by rolling movement at the articulating surfaces. The destruction of the discus can be seen as a physiological adaptation which brings back the joint to an original odontogen condition. |
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Keywords: | Normal and aged temporomandibular joint Bolus function Joint load |
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