Study on the reconstruction of a four-dimensional movement model and the envelope surface of the condyle in normal adults |
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| Institution: | 1. Department of Oral and Maxillofacial Surgery, National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Peking University School and Hospital of Stomatology, Beijing, P. R. China;2. Center of Digital Dentistry, Faculty of Prosthodontics, National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health, Peking University School and Hospital of Stomatology, Beijing, P. R. China;1. Department of Oral and Maxillofacial Surgery, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Glueckstrasse 11, D-91054 Erlangen, Germany;1. Department of Oral & Maxillofacial surgery, All India Institute of Medical Sciences, New Delhi, India;2. Department of Physiology, All India Institute of Medical Sciences, New Delhi, India;1. Head and Neck Academic Centre, University College London, Gower St, Bloomsbury, London WC1E 6BT, United Kingdom;2. Department of Oral and Maxillofacial Head and Neck Surgery, University College Hospital London, 235 Euston Rd, Bloomsbury, London NW1 2BU, United Kingdom;3. Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA;1. Division of Oral and Maxillofacial Surgery, Federal University of Ceará, Campus Sobral, Sobral, Brazil. Division of Oral and Maxillofacial Surgery, Walter Cantídio University Hospital, Federal University of Ceará, Fortaleza, Ceará, Brazil;2. Division of Oral and Maxillofacial Surgery, Walter Cantídio University Hospital, Federal University of Ceará, Fortaleza, Ceará, Brazil;3. Division of Oral and Maxillofacial Surgery, Leão Sampaio Universitary Center, Cariri, Ceará, Brazil. Division of Oral and Maxillofacial Surgery, Walter Cantídio University Hospital, Federal University of Ceará, Fortaleza, Ceará, Brazil;4. Division of Oral and Maxillofacial Surgery, Federal University of Ceará, Fortaleza, Brazil. Division of Oral and Maxillofacial Surgery, Walter Cantídio University Hospital, Federal University of Ceará, Fortaleza, Ceará, Brazil;5. Division of Oral Radiology, Federal University of Ceará, Fortaleza, Brazil. Division of Oral and Maxillofacial Surgery, Walter Cantídio University Hospital, Federal University of Ceará, Fortaleza, Ceará, Brazil |
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| Abstract: | The objective of this study was to reconstruct the envelope surface of the condyle and the four-dimensional trajectory model in mandibular border movement in normal adults. Eleven healthy subjects were selected as volunteers. Cone-beam computed tomographic (CBCT) scanning was performed on the volunteers. The three-dimensional (3D) movement path of the mandible was recorded using a virtual articulator (PN-300), which was based on a 3D model of the mandible. We used Proplan CMF 3.0 (Materialise) software to perform this from the DICOM data generated by CBCT scans. The distance of condylar movement was measured in this model during volunteers’ mouth opening, protrusion, and lateral excursions. The envelope surface of the condyle was reconstructed by merging a functional condylar surface at each recording moment during the movement of the whole border. In the mandibular digital models, the condyle moved downward firstly, and moved upward to the position of maximum mouth opening. The condyle moved forward and downward during protrusion. The working condyle rotated slightly and the non-working condyle moved forward, downward, and inward during lateral excursions. The mean (SD) movement distance of 11 subjects was 19.04 (4.37) mm during mouth opening (including downward and upward) and 9.75 (2.38) mm during protrusion. During lateral excursions the mean (SD) movement distance of the working condyle was 2.87 (1.13) mm, the mean (SD) movement distance of the non-working condyle was 10.85 (3.25) mm. The envelope surface of healthy volunteers showed a double-peak pattern. The envelope surface of the condyle and four-dimensional movement model can be reconstructed by merging the trajectory of the mandible recorded from the novel virtual articulator PN300 and a 3D image of the mandible. |
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| Keywords: | Digital technology Four-dimensional movement Envelope surface of condyle Temporomandibular joint |
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