Development of a measurement system for the mechanical load of functional appliances |
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| Institution: | 1. Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan;2. Department of Mechanical Engineering, School of Engineering, Tokyo Institute of Technology, Tokyo, Japan;1. Univ Lyon, Université Claude Bernard Lyon 1, IFSTTAR, LBMC UMR_T9406, F69622 Lyon, France;2. Univ Lyon, Université Claude Bernard Lyon 1, INSERM, Lyos UMR1033, F69622 Lyon, France;3. Service de Radiologie, Centre Hospitalier Lyon Sud, Pierre-Bénite, France;4. Service de chirurgie orthopédique et traumatologique – Hôpital d''instruction des armées Desgenettes, 69003 Lyon, France;1. Department of Sports Medicine and Health Promotion, Friedrich-Schiller University Jena, Wöllnitzer Straße 42, D-07749 Jena, Germany;2. Center of Interdisciplinary Prevention of Diseases related to Professional Activities, Friedrich-Schiller University Jena, D-07737 Jena, Germany;3. Department of Sports and Motion Science, University Stuttgart, Allmandring 28, D-70569 Stuttgart, Germany;4. Department of Sports Management, University Bayreuth, Universitätsstraße 30, D-95440 Bayreuth, Germany;1. Radboud University Medical Center, Radboud Institute for Health Sciences, Nijmegen, The Netherlands;2. Department of Orthopedic Surgery, State University of New York, Upstate Medical University, Syracuse, NY, USA;3. University of Twente, Laboratory for Biomechanical Engineering, Faculty of Engineering Technology, Enschede, The Netherlands |
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| Abstract: | Devices called functional appliances are commonly used in orthodontics for treating maxillary protrusion. These devices mechanically force the mandible forward to apply traction force to the mandibular condyle. This promotes cartilaginous growth in the small mandible. However, no studies have clarified how much traction force is applied to the mandibular condyle. Moreover, it remains unknown as to how anatomical characteristics affect this traction force. Therefore, in this study, we developed a device for measuring the amount of force generated while individual patients wore functional appliances, and we investigated the relationship between forces with structures surrounding the mandibular condyle. We compared traction force values with cone-beam computed tomography image data in eight subjects. The functional appliance resulted in a traction force of 339–1477 gf/mm, with a mean value of 196.5 gf/mm for the elastic modulus of the mandible. A comparison with cone-beam computed tomography image data suggested that the mandibular traction force was affected by the mandibular condyle and shape of the articular eminence. This method can contribute to discovering efficient treatment techniques more suited to individual patients. |
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| Keywords: | Functional appliances Orthodontics Mechanical load Temporomandibular joint Morphology |
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