Geometrics of tooth wear |
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| Authors: | Lifong Zou George Cherukara Pengwei Hao Kevin Seymour DYD Samarawickrama |
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| Affiliation: | 1. Centre for Adult Oral Health, Institute of Dentistry, Barts & The London, Queen Mary''s School of Medicine & Dentistry, London, UK;2. Department of Computer Science, Queen Mary University of London, UK;1. IPHES. Institut Català de Paleoecologia Humana i Evolució Social, Tarragona, Spain;2. Area de Prehistoria, Universitat Rovira i Virgili (URV), Tarragona, Spain;3. CENIEH. Centro Nacional de Investigación sobre Evolución Humana, Burgos, Spain;4. University College London (UCL) Anthropology, 14 Taviton Street, London WC1H 0BW, UK;5. Centro Mixto UCM-ISCIII de Evolución y Comportamiento Humanos, Madrid, Spain;6. Departamento de Paleontología, Facultad Ciencias Geológicas, Universidad Complutense de Madrid, Spain;1. Department of Orthodontics, Maurice and Gabriela Goldschleger School of Dental Medicine and the Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv 69978, Israel;2. UMR 5199 – PACEA, Anthropologie des populations passées et présentes, Université Bordeaux 1, avenue des Facultés, 33405 Talence, France;1. School of Medicine, College of Medicine, China Medical University, Taichung, 40402, Taiwan;2. Department of Biotechnology, Asia University, Taichung, 41354, Taiwan;3. China Medical University Beigang Hospital, Yunlin, 65152, Taiwan;4. Computational and Systems Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;1. Unité de Recherches en Biomatériaux Innovants et Interfaces (URB2i) — EA442, Faculté de Chirurgie Dentaire, Université Paris Descartes, Sorbonne Paris Cité and Service d’odontologie, Hôpital Albert Chenevier, Assistance Publique — Hôpitaux de Paris, France;2. Dental Biomaterials Research Unit (d-BRU) and Department of Fixed Prosthodontics, Institute of Dentistry, University of Liège (ULiège) and University of Liège Hospital (CHU), Liège, Belgium |
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| Abstract: | Wear measurement implies the need for comparative measurements based on a reference frame. In this study, part of a tooth surface (common area) is proposed to be a reference frame for the comparative measurement. A registration procedure applies an iterative closest point algorithm for the least square best fit of the two surfaces on this common area. When the common area matches the best fit condition, the difference at the remaining part of the tooth surface represents changes between the two surfaces; in this case signifying tooth wear.The minimum requirements to verify tooth wear results are a three quadrant spherical surface of a molar tooth to be common area, and the fit of the common area needs to be less than 10 μm, to achieve the sensitivity of wear measurement up to the 100 μm level on the occlusal tooth surface. Incise apparatus was used for the digitisation of the tooth surface. Cloud, a 3-D image analysis software package was utilised for visualisation, registration and image analysis. A mathematical scrutiny was applied to validate the findings in theory. The proposed methodology is proven to be adequate to quantify tooth wear. |
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