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Conferencia Prof. Michel Dalstra (Universidad de Aarhus)

Conferencia prof. Michel Dalstra ( Universidad de Aarhus ) sobre biomecanica e imagen 30 en ortodoncia y cirugía ortognática.
Michel Dalstra is an associate professor at Aarhus University, where he has been involved with teaching and research in biomechanics since late 1993, when he moved from the Netherlands to Denmark.

His main seat is currently at the Department of Orthodontics, School of Dentistry, but he also has both formal and informal ties with the Engineering College of Aarhus and the departments of Orthopaedics and Forensic Medicine at Aarhus University Hospital.

His areas of expertise are dental and tissue ( especially bone) biomechanics, as well as the biomechanics of orthopaedic implants; the latter being his “inheritance” from his graduate and doctoral studies at the Orthopaedic Research Unit at the St. Radboud Hospital, Nijmegen University, the Netherlands, where he defended his doctoral thesis “Biomechanical aspects of the pelvic bone and design criteria for acetabular prostheses” just prior to moving to Aarhus.

In his research he has made extensive use of the Finite Element Method for the simulation of load transfer, mechanical testing of biological tissues and microtomography as a means to visualize the three-dimensional structure and architecture of bone biopsies and jaw specimens. Finally, recent developments in new imaging techniques in the field of orthodontics have added virtual maxillofacial surgery planning to his list of research interests.

Biomechanics is the science that deals with mechanical influences on biological systems. In a more narrow, and perhaps more clinical, context, it studies how the different tissues of the human body are affected by and are reacting to mechanical loading. What force is needed to fracture a bone? How can orthopaedic implants ar artificial heart valves be designed optimally? What makes a tooth to move in the jaw during orthodontic treatment? These are justa few questions, which the field of biomechanics tries to find answers to. One of the available tools for this is modeling and in arder to create an anatomically accurate three-dimensional (30) model of the structure to be studied, a number of imaging techniques can be used. Computer tomography (CT) and magnetic resonance (MR) create a series of individual scans, which when stacked together representa 30 data-set of the scanned body part. Recently also, sorne variants of CT-scanning have been developed, like microCT-scanning, which allows high-resolution scans of small tissue samples, and cone-beam CT, which has a lower radiation dose than conventional CT and therefore has become popular in the field of dentistry. The resulting 30 reconstructions are then either called surface- or volume-based, respectively and can then be used for subsequent analysis, like anatomical measurements of distances, angles, surfaces and volumes, virtual surgery simulations or finite element analysis.

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