Department of Orthodontics, Head: Prof. Dr. A. Jäger
Scientific assistant, head of study group on Experimental Orthodontics
Reader in Orthodontic Biomechanics and Experimental Dentistry
19.10.1992 Doctorate at the Faculty of Natural science and Mathematics of ‘Rheinische Friedrich-Wilhelms-Universität Bonn’
Habilitation at the Medical Faculty of ‘Rheinische Friedrich-Wilhelms-Universität Bonn’
22.02.2005 Appointment of Professorship
27.07.2006 Primo loco on the list and call for an Endowed Chair in Oral Technology at the University of Bonn
Honours and Awards
1991 Best Paper of the Year Award by the Deutsche Gesellschaft für Kieferorthopädie, together with H.A. Schumacher and D. Drescher
1992 Helen and B.S. Dewel Award by the American Association of Orthodontists, together with A.D. Vardimon, T.M. Graber, and D. Drescher
2007 European Orthodontic Society Distinguished Teacher’s Award 2007
since 1992 a total of 11 awards for scientific poster board presentations, including EOS, DGKFO, DGI and Dentsply awards.
Serving as reviewer for
American Journal of Orthodontics and Dentofacial Orthopedics, Angle Orthodontist, Biomaterials, Computer Methods in Biomechanics and Biomedical Engineering, European Journal of Orthodontics, Orthodontics and Craniofacial Research, IEEE Transactions on Biomedical Engineering, Journal of Biomechanics, Journal of Dental Research, Journal of Materials Science, Journal of Orthodontics, Journal of Orofacial Orthopaedics / Fortschritte der Kieferorthopädie, Journal of the Electrochemical Society
EU (DGXII), German Research Foundation (DFG), University of Leuven (K.U.Leuven), The Netherlands Organisation for Health Research and Development, Instituut voor de aanmoediging van innovatie door Wetenschap & Technologie in Vlaanderen (IWT-Vlaanderen)
Member of the Editorial board of Journal of Orofacial Orthopaedics and Orthodontics and Craniofacial Research
More than 120 papers in national and international journals in biomechanics, biomedical engineering, physics, orthodontics and dentistry, around 250 interdisciplinary oral and poster presentations on Congresses and Symposia
Dental biomechanics, experimental biomechanics, analysis and numerical simulation of tooth movements, techniques of measurement in orthodontics, nonlinear Finite Element Analysis of tooth mobility, computerised analysis and design of orthodontic appliances, development of superelastic wires for orthodontic appliances, friction in arch guided tooth movement, corrosion and intraoral aging of dental materials, wear and permanent fracture of dental materials, optomechanical and laser optical measurement techniques, biomechanical analysis of immediately loaded implants
DATES AND VENUES Date Venue Contact
Rome, Italy Professor Paolo Cozza
firstname.lastname@example.org Friday, 7th March 2008 Amsterdam, Netherlands Mrs Birgit Paniry at email@example.com Friday, 16th May 2008 Barcelona, Spain Dr Andreu Puigdollers Saturday, 1st November 2008 Sofia, Bulgaria Professor Valentin Moutaftchiev
A Review of Orthodontic Biomechanics Biomechanical research in the field of orthodontics started in the early sixties with the work of Burstone and collaborators on the mechanical behaviour of orthodontic appliances and the numerical analysis of teeth under orthodontic loading. Since then the experimental and numerical resources have increased significantly. Nevertheless we are still far away from a full understanding of how the orthodontic load is transferred into a mechanical stimulus within the tooth's socket, initiating bone remodelling processes. After a short introduction into basic principles of biomechanics in general, this presentation will summarize the recent biomechanical work in the field of orthodontics: biomechancial behaviour of the periodontal ligament (PDL), combined histological and biomechanical work to study the nature of orthodontic tooth movement, numerical bone remodelling simulation of orthodontic tooth movements, experimental and theoretical determination of centres of resistance of single- and multi-rooted teeth and groups of teeth, and biomechanics of orthodontic anchorage implants.
A Review of Orthodontic Materials Science Proper selection of materials and devices has an extreme influence on the performance of an orthodontic appliance. Above all, forces and torques depend on the wire alloy and cross section. Reduction of forces and torques with the aim to reduce the risk of damage of the tooth supporting structures has made enormous progress in the past years. Since the introduction of Nitinol, the first nickel titanium shape memory alloy, into orthodontics in 1971 by Andreasen, nickel titanium alloys have found broad interest and nearly every manufacturer offers a variety of nickel titanium wires with different mechanical characteristics. This lecture gives a survey of the basic material properties of superelastic NiTi alloys, their clinical force systems, and their intraoral corrosion behaviour and biocompatibility. Clinical consequences of intraoral force systems as well as intraoral and experimentally simulated Ni-ion release are discussed. A further aspect of orthodontic material science of particular importance is the frictional behaviour of various bracket/wire combinations in arch guided tooth movement. Physical background, affecting material parameters, and results for various arch/wire bracket systems are discussed with a special emphasis on self ligating bracket systems.