Computational and clinical investigation on the role of mechanical vibration on orthodontic tooth movement |
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| Affiliation: | 1. School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia;2. Department of Orthodontics, Faculty of Dentistry, Ondokuz Mayis University, Atakum, Samsun, Turkey;3. Faculty of Dentistry, The University of Sydney, NSW 2006, Australia;4. Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany;5. Department of Bioclinical Sciences, Faculty of Dentistry, Kuwait University, Kuwait City, Kuwait;1. Consultant, Department of Orthodontics, William Harvey Hospital, East Kent Hospitals University NHS Foundation Trust, Ashford, United Kingdom;2. Postgraduate student, Department of Orthodontics, King''s College London Dental Institute, London, United Kingdom;3. Postgraduate student, Department of Orthodontics and postdoctoral fellow, Department of Oral Technology; School of Dentistry, University of Bonn, Bonn, Germany;4. Consultant, Department of Orthodontics, Royal Alexandra Children''s Hospital, Brighton and Sussex University Hospitals NHS Foundation Trust, Brighton, United Kingdom;5. Professor, Department of Orthodontics, King''s College London Dental Institute, Hon consultant in orthodontics, Guy''s and St Thomas'' NHS Foundation Trust, London, United Kingdom;1. Graduate student, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical University, Chongqing, China;2. Assistant professor, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical University, Chongqing, China;3. Professor, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical University, Chongqing, China;4. Professor, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Medical University, Chongqing; professor, Key Laboratory for Biomechanics and Mechanobiology of Chinese Education Ministry, International Research Center for Implantable and Interventional Medical Devices, Beihang University, Beijing, China;1. Specialist in Orthodontics (MSc), PhD Student, University of Al-Baath Dental School, Hamah, Syria;2. Associate Professor, Department of Orthodontics, University of Damascus Dental School, Damascus, Syria;3. Professor, Department of Orthodontics, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Kingdom of Saudi Arabia;1. Department of Orthodontics, William Harvey Hospital, East Kent Hospitals University NHS Foundation Trust, Ashford, United Kingdom;2. Department of Orthodontics, King''s College London Dental Institute, London, United Kingdom;3. Clinic of Orthodontics and Pediatric Dentistry, Center of Dental Medicine, University of Zurich, Zurich, Switzerland;4. Department of Orthodontics, Royal Alexandra Children''s Hospital, Brighton and Sussex University Hospitals NHS Foundation Trust, Brighton, United Kingdom |
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| Abstract: | The aim of this study is to investigate the biomechanics for orthodontic tooth movement (OTM) subjected to concurrent single-tooth vibration (50 Hz) with conventional orthodontic force application, via a clinical study and computational simulation. Thirteen patients were recruited in the clinical study, which involved distal retraction of maxillary canines with 1.5 N (150 g) force for 12 weeks. In a split mouth study, vibration and non-vibration sides were randomly assigned to each subject. Vibration of 50 Hz, of approximately 0.2 N (20 g) of magnitude, was applied on the buccal surface of maxillary canine for the vibration group. A mode-based steady-state dynamic finite element analysis (FEA) was conducted based on an anatomically detailed model, complying with the clinical protocol. Both the amounts of space closure and canine distalization of the vibration group were significantly higher than those of the control group, as measured intra-orally or on models (p < 0.05). Therefore it is indicated that a 50 Hz and 20 g single-tooth vibration can accelerate maxillary canine retraction. The volume-average hydrostatic stress (VHS) in the periodontal ligament (PDL) was computationally calculated to be higher with vibration compared with the control group for maxillary teeth and for both linguo-buccal and mesial-distal directions. An increase in vibratory frequency further amplified the PDL response before reaching a local natural frequency. An amplification of PDL response was also shown to be induced by vibration based on computational simulation. The vibration-enhanced OTM can be described by mild, vigorous and diminishing zones among which the mild zone is considered to be clinically beneficial. |
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| Keywords: | Dental biomechanics Vibration-enhanced orthodontic tooth movement Periodontal ligament Orthodontic tooth movement Orthodontic space closure |
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