Bernd Lapatki received his dental degree from the University of Freiburg, Germany, in 1994. He defended the Dr. med. dent. degree in 1998, and his Habilitation thesis in 2007. He also received a PhD. degree in neurophysiology from Radboud University Nÿmegen, Netherlands in 2010. His clinical career commenced in 1995 practicing as a general dentist before his postgraduate studies at the Department of Orthodontics, Freiburg University Medical Centre. Since 2009, he has been Professor of Orthodontics and Head of the Department of Orthodontics at the University of Ulm, and since 2013, Director of the Centre of Dentistry at this University. In 1999 he was awarded, by the Faculties of Medicine and Applied Sciences of the University of Freiburg, an award for the best dissertation in the ﬁeld of medicine/medicine technique. In 2004, he received the Alex Motsch Award from the German Society of Dentistry and Oral Medicine, and in 20017, the Arnold Biber Award (the highest scientiﬁc award of orthodontics in Germany) by the German Orthodontic Society. The research of his group focuses on numerical simulation and experimental evaluation of orthodontic treatment mechanics including multibracket appliances and aligners, the development and evaluation of digital methods for orthodontic diagnosis and treatment, and the physiology of the facial and masticatory motor systems. His clinical focus includes application of segmented arch techniques and treatment mechanics based on skeletal anchorage.
First steps towards clinical force-moment monitoring with telemetric smart brackets – a new-generation fixed appliance
This presentation will focus on the importance of adequate dimensioning of the forces and moments applied during orthodontic therapy and summarize the development of telemetric smart brackets over the last 15 years.
Measuring the three-dimensional (3D) force-moment (F/M) systems exerted on individual teeth during orthodontic therapy is highly desirable for accurate spatial control of tooth movement and for reducing traumatic side effects such as irreversible root resorption. To date, suitable tools for monitoring the applied F/M system during clinical therapy have been lacking. A true-scale orthodontic bracket with an integrated microelectronic stress sensor system for 3D F/M measurements on individual teeth has previously been introduced. The underlying theoretical concept assumes a linear correlation between externally applied F/M systems and mechanical stresses induced within the smart bracket. The validity of this methodological approach has been theoretically proven using finite element simulations, and also experimentally demonstrated by measurements with real true-scale smart brackets with wire-mediated data transmission. Recently, the technical challenge of incorporating a telemetric system for energy and data transmission within a true-scale smart bracket has been overcome. This major step was realized by assembling a sensor chip and a microcoil (both with a surface size of only 2 × 2.5 mm2) with a standard ceramic bracket slot with reduced thickness. This first telemetric smart bracket was monitored over a distance which was sufficient to allow a contactless operation. Telemetrically extracted sensor data are demodulated, digitized and decoded by a reader unit. The readout tool is connected to a graphical user interface which allows the orthodontist to select F/M values relevant for the specific clinical situation. F/M values were successfully acquired by the telemetric smart bracket with resolutions better than 60 mN and 0.14 Nmm, respectively, which might be considered as clinically sufficient. Hence, clinical application of wireless smart brackets stands on the verge of a breakthrough.
Aims, Objectives & Learning Outcomes
- Aims: To provide an introduction to the novel concepts involved in F/M dimensioning in orthodontics.
- Objectives: This lecture will provide a contemporary overview of the importance of adequate F/M dimensioning during orthodontic therapy, and will summarize the development of telemetric smart brackets.
- Learning outcomes: This presentation will make delegates aware of the risks of overloading of teeth during orthodontic treatment. Furthermore, it will outline clinical application scenarios of smart brackets with telemetric functionality with a view to their possible future integration in fixed appliance therapy.