Speakers and Abstracts The effects of digital dentistry workflow on the development of innovative technologies

Univ.-Prof. Prof. h. c. mult. Dr. mult. Robert Sader Department of Oral, Cranio-Maxillofacial and Facial Plastic Surgery, University Hospital Frankfurt, Frankfurt, Germany

The development of a digital workflow based on new medical 3D devices has changed the world of dental treatment. Optimizing the treatment result adds to the increasing complexity of the treatment`s workflow; increasing costs are an additional side effect. Innovations have created not only new possibilities, but also new problems and hazards. This increases the demand not only to develop new other technologies, but also to include more fundamental biological principles in reconstructive oral surgery. The presentation should clearly show that the goal should be to imitate nature more and more and not to replace biological approaches by technical ones. As a consequence, old techniques like osseofixation could experience a revival and could be an alternative to osseointegration. But if it becomes possible to use new digital technologies and combine these with physiologic principles, then new application fields could be established for the benefit of the patients. To prove these new possibilities of 3D operation, planning and CAD/CAMbased manufacturing of patient-specific implants in dental implantology will be presented. It will be shown that using new digital tools lead directly to surgical innovations, such as the development of new surgical devices like laser osteotomy or the production of 3D-printed dental implants to achieve further improvements of the esthetic and functional result in oral reconstructions. In this way, implantbased dental restorations will be made possible even in complex patients who could not be treated up until now. The next step will be the inclusion of artificial intelligence.

Computational modeling of temporomandibular joint biomechanics

Benedikt Sagl, PhD Research Associate at the University Clinic of Dentistry, Vienna, Austria

Abstract

Functional impairment of the masticatory region can have a significant impact, ranging from a loss of quality of life to severe health issues. Commonly, increased temporomandibular joint (TMJ) loading is connected with temporomandibular disorders (TMD). Due to the small size and complex structure of the masticatory region, in vivo investigations of TMJ biomechanics are difficult to perform. Hence, biomechanical computer simulation remains an important tool for the investigation of the function of this complex system. This talk will present current computational modeling projects performed by our group at the University Clinic of Dentistry, focusing on TMJ stress during chewing and bruxing. Our investigations use a novel biomechanical computer model that enables dynamic, muscle-driven simulations of mandibular function. The computed model was used to thoroughly investigate the effect of tooth morphology and position on TMJ biomechanics during laterotrusive tooth grinding. Additionally, we investigated the effect of food bolus parameters on TMJ biomechanics during a unilateral chewing cycle. Our bruxing simulations suggest that steeper teeth have a protective effect on TMJ loading, which might suggest a benefit to a lateral canine guidance. Moreover, our chewing simulations show decreased loading of the TMJ when chewing softer and smaller food pieces, which supports the current TMD self-management guidelines.

Overall, the aim of this talk is to highlight various projects that use computational modeling approaches to study research questions that are virtually impossible to perform in vivo without the serious risk of harming patients. These computational investigations can be used to improve our understanding of the masticatory system in a safe and controlled manner and are hence a highly relevant tool in modern dental research.