de Wild, Michael
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Geometric cuts by an autonomous laser osteotome increase stability in mandibular reconstruction with free fibula grafts. A cadaver study
2024, Gottsauner, Maximilian, Morawska, Marta M., Tempel, Simon, Müller-Gerbl, Magdalena, Dalcanale, Federico, de Wild, Michael, Ettl, Tobias
Development of models for additively manufactured actuators using compliant Wren mechanism
2021-11, Lennart, Rubbert, Schuler, Felix, Gayral, Thibault, de Wild, Michael, Renaud, Pierre
Compliant Wren mechanisms (CWM) constitute specific compliant structures of particular interest. Derived from Wren mechanisms, they can exhibit a large variety of motions, from quasi translation to quasi rotation. In this paper, the development of models for the analysis and synthesis of CWM is considered. A kinematic model is introduced first to assess all possible motions when used as an actuator. Then the static model and stress expressions are derived to help their design. These derivations are achieved for two types of geometries, corresponding to the geometries of interest. CWM are filigree structures, whose manufacturing is difficult to consider without additive manufacturing. A specific work on their production using selective laser melting (SLM) is then achieved to ensure the reliability of their production. As a proof of concept, a pneumatically actuated component is then developed and tested. It is composed of two CWM of different geometries. It offers the possibility to obtain translation and rotation using a single pressure input. The developed models are investigated using finite element models and experiments using additively manufactured structures.
Geometric cuts by an autonomous laser osteotome increase stability in mandibular reconstruction with free fibula grafts. A cadaver study
2024, Gottsauner, Maximilian, Morawska, Marta M., Tempel, Simon, Müller-Gerbl, Magdalena, Dalcanale, Federico, de Wild, Michael, Ettl, Tobias
Background Nonunion and plate exposure represent a major complication after mandibular reconstruction with free fibula flaps. These drawbacks may be resolved by geometric osteotomies increasing intersegmental bone contact area and stability. Purpose The aim of this study was to compare intersegmental bone contact and stability of geometric osteotomies to straight osteotomies in mandibular reconstructions with free fibula grafts performed by robot-guided erbium-doped yttrium aluminum garnet laser osteotomy.
CaP bone‐like coating for fast osseointegration of dental implants
2020-10-05, Dalcanale, Federico, Bitiqi, Hekuran, de Wild, Michael
Parameter optimization in a finite element mandibular fracture fixation model using the design of experiments approach
2023-08, Maintz, Michaela, Msallem, Bilal, de Wild, Michael, Seiler, Daniel, Herrmann, Sven, Feiler, Stefanie, Sharma, Neha, Dalcanale, Federico, Cattin, Philippe, Thieringer, Florian Markus
Smart 4D-printed implants and instruments
2020-09, de Wild, Michael, Schuler, Felix
Selective laser melting (SLM) was used to manufacture smart programmed structures with customized properties made of biocompatible NiTi shape-memory alloy. A series of helixes was produced with systematically varied SLM process parameters Laser Exposure Time and Laser Power in order to specifically change the thermo-mechanical material properties of the 3D-structures. This innovation opens up the possibility to adjust the NiTi phase transformation temperature during the manufacturing process. This controllable property determines which of the two crystallographic phases martensite or austenite is present at a certain operating temperature and allows the mechanical properties to be adjusted: martensitic devices are soft and pseudo-plastic due to the shape-memory effect, whereas austenitic structures are pseudo-elastic. In a further step, the SLM process parameters were locally varied within 4D-printed twin-helixes. As a result, the phases, respectively the mechanical properties of a single component were adjusted at different locations. The ratio of elastic to plastic deformation and the spring constant of the helix can be locally controlled. This allows, for example, the spatio-temporal programming of 3D-printed surgical instruments or implants that are stimuli-responsive.